In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. The solution was heated by burning natural gas in a Bunsen burner to distill the ethanol that formed in the flask. During the distillation, the ethanol evaporated and then condensed in the receiving flask. The flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. During this experiment the following changes occurred. Which of these changes involved a physical change and not a chemical change? Check all that apply. Check all that apply.
1-condensation of ethanol
2-evaporation of ethanol
3- formation of carbon dioxide gas from glucose burning of natural gas
4-formation of ethanol from glucose by yeast
5-formation of a carbon deposit inside the flask

Answer:

The names or formulas are below, just look for the the names or symbols in the tables, write them and cross the powers without the signs.

Explanation:

Ammonium sulfide         (NH₄)₂S

Iron III chloride                FeCl₃

Aluminum Nitrate

Barium acetate               Ba(C₂H₃O₂)₂

Calcium bromide

Sodium nitrate

Lithium oxide               Li₂O

Copper II bromide       CuBr₂

Calcium hydroxide

Ammonium phosphate

Magnesium nitrate

Strontium nitrate          Sr(NO₃)₂

Silver sulfide                 Ag₂S

Cobalt III hydroxide      Co(OH)₃

Copper II chloride

Potassium sulfide

Iron III sulfate

Mg₃(PO₄)₂

Sn(NO₃)₄

Sodium phosphate

Answer:

The answer is 5.7 minutes

Explanation:

A first-order reaction follow the law of [tex]Ln [A] = -k.t + Ln [A]_{0}[/tex]. Where [A] is the concentration of the reactant at any t time of the reaction, [tex][A]_{0}[/tex] is the concentration of the reactant at the beginning of the reaction and k is the rate constant.

Dropping the concentration of the reactant to 6.25% means the concentration of A at the end of the reaction has to be [tex][A]=\frac{6.25}{100}.[A]_{0}[/tex]. And the rate constant (k) is 8.10×10−3 s−1

Replacing the equation of the law:

[tex]Ln \frac{6.25}{100}.[A]_{0} = -8.10x10^{-3}s^{-1}.t + Ln[A]_{0}[/tex]

Clearing the equation:

[tex]Ln [A]_{0}.\frac{6.25}{100} - Ln [A]_{0} = -8.10x10^{-3}s^{-1}.t[/tex]

Considering the property of logarithms: [tex]Ln A - Ln B = Ln \frac{A}{B}[/tex]

Using the property:

[tex]Ln \frac{[A]_{0}}{[A]_{0}}.\frac{6.25}{100} = -8.10x10^{-3}s^{-1}.t[/tex]

Clearing t and solving:

[tex]t = \frac{Ln \frac{6.25}{100} }{-8.10x10^{-3}s^{-1} } = 342.3s[/tex]

The answer is in the unit of seconds, but every minute contains 60 seconds, converting the units:

[tex]342.3x\frac{1min}{60s} = 5.7min[/tex]

Answer: This is an example of a qualitative analysis.

Explanation:

Qualitative analysis is used to determine which types of things are present in a system.

Quantitative analysis is used to determine how much of those things are present in a system.

In this case, the scientist is only investigating which metals are in te water, not how much.

Answer:

Qualitative Analysis

Explanation:

Qualitative Analysis is the experimental procedure for identifying elements or constituents in a chemical sample.

Quantitative has to do with in what amount or quantity these quantity exists. It aslo deals with the amoiunt that is needed for an acid to react with base and they reach an end point.

haven defined the above, it is okay to conclude that

A scientist analyzes a sample of ground water to determine which heavy metals have contaminated the source. is an example of Qualitative Analysis

Answer:

From hypotonic to hypertonic

Explanation:

Water diffusion is a phenomenon that occurs when a solute (eg. a salt) is present in different concentrations in different areas. Because the concentration is inversely proportional to volume (meaning that the higher the volume, the lower the concentration), water will move from areas with lower concentration (hypotonic) to areas with higher concentration (hypertonic), so as to match the concentrations.

Answer:

Water will move from hypotonic to hypertonic solutions

Explanation:

When a hypotonic solution is separated by a permeable membrane from another solution with more solute (hypertonic), water will move across the membrane until both solutions have the same concentration: when water comes into the compartment with hypertonic solution, this solute dissolves.

Water will not move from hypertonic to hypotonic without energy addition.

Answer:

189.91g

Explanation:

Given parameters:

Mass of beaker with oil = 200.6g

Mass of beaker = 10.69g

Unknown:

Mass of corn oil = ?

Solution:

To find the mass of corn oil, we know that:

 Mass of beaker with oil = Mass of beaker + mass of corn oil

Therefore:

           Mass of corn oil = Mass of beaker with oil - Mass of beaker

    Mass of corn oil = (200.60 - 10.69)g

    Mass of corn oil = 189.91g

Answer:

B.  1.7 g/cm^3.

Explanation:

Density = mass / volume

= 520 / 300

=  1.733.

The density of a substance is calculated by dividing mass by the volume of the object. A substance weighing 520 grams has a density of 1.7 g/cm³. Thus, option B is correct.

Density has been constituted of mass in grams per cubic centimeter of substance. The volume inversely affects the density possessed by the substance. It gives the estimation of buoyancy and whether the object will float or sink.

It is calculated with the help of mass and volume and its formula is given as,

Density (D) = Mass (m) ÷ Volume (V)

Given,

Volume (V) = 300 cubic centimeter

Mass (m) = 520 grams

Density is calculated as,

Density (ρ) = Mass (M) ÷ Volume (V)

ρ = 520 ÷ 300

ρ =  1.733 grams per cubic centimeter

Therefore, option B. 1.7 grams per cubic centimeter is the density of the substance.

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The new solution with 40 grams of solute in 160 grams of solvent is saturated, as it has the same concentration of solute per 100 grams of solvent as the original saturated solution.

When a solution reaches the point where no additional solute will dissolve, it is considered saturated. In the student's original solution, 25 grams of solute in 100 grams of solvent represents a saturated solution. If a new solution contains 40.0 grams of solute in 160 grams of solvent, we must compare the concentration of solute to the solvent's ability to dissolve that solute at a given temperature. Assuming temperature is constant and solubility does not change, the new solution can be compared to the original by calculating the concentration of solute per 100 grams of solvent. In the original solution, the saturated concentration is 25 grams of solute per 100 grams of solvent. In the new solution, adjusting to per 100 grams of solvent, we have 25 grams of solute per 100 grams of solvent (since (40 grams/160 grams)*100 equals 25). This means the new solution has the same concentration as the original saturated solution, and thus, it is also saturated.

Answer:

The answer to your question is: 53.46 % pure

Explanation:

data

Fe = 1.92 ✕ 103 kg   produced    = 1920 kg

Fe2O3 = 5.13 ✕ 103 kg    sample   = 5130 kg

MW Fe2O3 = (56x2)+(16x3) = 160 kg

% of purity = ?

                   Fe2O3 + 3 CO → 2 Fe + 3 CO2

Convert mass to moles

Fe

      56 kg  --------------------- 1 mol

  1920 kg ---------------------   x moles       x = 34.28 moles

From the reaction

   1 mol of Fe2O3 ---------------------  2 moles of Fe

      x moles of Fe2O3 --------------- 34.28 moles

  x = 34.28/2 = 17.14 moles of Fe2O3

       160 kg of FE2O3 ----------------  1 mol

             x kg of Fe2O3---------------  17.14 moles

x = 17.14 x 160/1 = 2742,4 kg of Fe2O3  It's supposed to be the amount of Fe if it was 100% pure.

                             2742.4 kg of Fe2O3 ----------------  100%

                              5130 kg of Fe2O3 -------------------   x

x = (2742.4x100)/5130 = 53.46 pure

Answer:

The reaction of 192 g of [tex]O_2[/tex] and 126 g of [tex]B_5H_9[/tex] can produce 81 g of Water.    

Explanation:

We have the reaction:

[tex]2B_5H_9 + 12O_2 -> 5B_2O_3 + 9H_2O[/tex]

There are 192 g of [tex]O_2[/tex] and 126 g of [tex]B_5H_9[/tex].  

First step to calculate the water produced is to find the limit reagent. Molecular weights for those substances involved in the chemical reaction are:  

[tex]B_5H_9[/tex] = 63.12 g/mol

[tex]O_2[/tex] = 32 g/mol

[tex]B_5O_3[/tex] = 69.62 g/mol

[tex]H_2O[/tex] = 18 g/mol

Now, we can express 192 g of [tex]O_2[/tex] and 126 g of [tex]B_5H_9[/tex] as mol dividing the mass using the molecular weight.

[tex]192 g O_2 (\frac{1mol O_2}{32 g O_2} )= 6 mol O2\\ 126 g B_5H_9 (\frac{1mol B_5H_9}{63.12 g B_5H_9} ) = 1.99 mol B_5H_9[/tex]

After that, we should divide the mol of reagent with their respective stoichiometric coefficient to find the limit reagent so:

[tex]6 mol O_2 / 12 mol O_2 = 0.5 \\1.99 mol B_5H_9 /2 mol B_5H_9 = 0.99 \\[/tex]

It means the limit reagent is Oxygen - [tex]O_2[/tex].

Second step to calculate water produced is to use stoichiometric calculations using oxygen amount. According to the balanced equation 12 mols of [tex]O_2[/tex] will produce 9 mols of [tex]H_2O[/tex] . After that, using molecular weight of water [tex]H_2O[/tex] = 18 g/mol we can calculate the mass. It is shown in the next equations:  

[tex]6 molO_2 (\frac{9molH_2O}{12molO_2} ) (\frac{18 gH_2O}{1molH_2O} ) = 81 g H_2O[/tex].

Finally, we found that the reaction of 192 g of [tex]O_2[/tex] and 126 g of [tex]B_5H_9[/tex] can produce 81 g of Water.  

Using stoichiometry and information from the balanced chemical equation, we can determine that the reaction of 126 g B5H9 and 192 g O2 can produce approximately 162 g of water.

This question is about a chemical reaction between B5H9 and O2, producing water (H2O), among other substances. To figure out how much water can be produced, we need to understand stoichiometric calculations. Analyzing the given balanced equation, we can see that 2 moles of B5H9 react with 12 moles of O2 to produce 9 moles of water.

To find the quantity of water produced (in grams), we first need to find out how many moles of both B5H9 and O2 we have. The molar mass of B5H9 is around 63 g/mol, and for O2 it's 32 g/mol. So, we have approximately 2 moles of B5H9 and 6 moles of O2. The limiting reagent in this case is B5H9 since it will finish first in the chemical reaction.

As per the balanced equation, 2 moles of B5H9 can produce 9 moles of water. So, 2 moles of our limiting reagent (B5H9) will produce 9 moles of water. Since the molar mass of water is 18 g/mol, we multiply 9 moles by 18 g/mol to get approximately 162 g of water that can be produced.

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Acidity.  As you go down it’s more of an acid as you go up it becomes more of a base

Final answer:

A decrease in pH from 9 to 8 indicates an increase in the concentration of [OH-] tenfold (10X).

Explanation:

The pH of a solution is a measure of how acidic or basic it is. A pH of 9 indicates a basic solution, while a pH of 8 indicates a slightly less basic solution. As the pH decreases from 9 to 8, the concentration of [OH-] increases tenfold (10X) compared to what it was at pH 9.

Answer:

CH₅N

Explanation:

In the combustion, all of the C in the compound was used to produce CO₂ in a 1:1 ratio. Thus, the moles of CO₂ (MW 44.01 g/mol) produced equals the moles of C in the compound:

(44.0 g)(mol/44.01g) = 0.99977 mol CO₂ = 0.99977... mol C

Similarly, all of the H in the compound was used to produce H₂O in a ratio of 2H:1H₂O. The moles of H₂O (MW 18.02 g/mol) produced was:

(45.0 g)(mol/18.02g) = 2.497...mol H₂O

Moles of H is found using the molar ratio of 2H:1H₂O:

(2.497...mol H₂O)(2H/1H₂O) = 4.994...mol H

The ratio of H to C in the compound is:

(4.994...mol H)/(0.99977... mol C) = 5 H:C

Some NO₂ was produced from the N in the compound. Assuming a 1:1 ratio of C:N, the simplest empirical formula is: CH₅N.

The empirical formula of the compound contains 1 C and 5 H atoms. Without information on the amount of NO₂ produced, it is impossible to determine the specific amount of N in the empirical formula.

First, we should determine the number of moles of carbon and hydrogen in the compounds produced. From the produced CO₂, every 44.0 g of CO₂ contains 1 mole of carbon. So, we have 44.0 g/44 g/mol = 1 mol of carbon. In the compound, this corresponds to 1 C.

For the produced H₂O, each 18.0 g of H₂O contains 2 moles of hydrogen. Hence, we have 45.0 g/18 g/mol x 2 = 5 moles of hydrogen. In the compound, this corresponds to 5 H.

Since nitrogen is the only element left, its subscript will be the difference between the total moles of the compound and the sum of the moles of carbon and hydrogen. However, no information is given on the amount of NO₂ produced to determine the moles of nitrogen. Thus, without additional information, we can’t definitively determine the empirical formula.

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The r.a.m. value of krypton (Kr) A. 36 amu.

Relative atomic mass is a dimensionless physical quantity. it is the ratio of the average mass of atoms of an element (from a single given sample or supply) to 1/12th of the mass of an atom of carbon-12 (known as the unified atomic mass unit).

The relative atomic mass of an element is a weighted average of the masses of the atoms of the isotopes – due to the fact if there may be a whole lot extra of one isotope then it will impact the average mass lots greater than the less ample isotope will.

As an example - carbon is 12 times heavier than one hydrogen atom. Relative atomic mass is the atomic weight compared to at least one/12 the mass of one atom of carbon. considering that it's miles a contrast of atomic weight with 1/12 the mass of an atom of carbon it is termed relative atomic mass.

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Answer:

Explanation:

The acidity of a solution is measured by its pH, which is the logarithm of the inverse of the molar concentration of hydronium (H₃O⁺) ions:

When you know the pH value you can find hydronium concentration using the antilogaritm function:

[tex]pH=-log[H_3O^{+}]\\ \\ {[H_3O^+]}=10^{-pH}\\ \\ {[H_3O^+]}=10^{-2.50}\\ \\ {[H_3O^+]}=0.0032[/tex]

The unit of molar concentration is M.

To prove your answer you can take the logarithm of 0.0316:

The hydronium ion concentration corresponding to a pH of 2.50 is [tex]{3.16 \times 10^{-3} \text{ M}}\).[/tex]

To find the hydronium ion concentration ([H3O+]), we use the definition of pH, which is the negative logarithm (base 10) of the hydronium ion concentration:

[tex]\[ \text{pH} = -\log_{10} [\text{H}_3\text{O}^+] \][/tex]

Given the pH is 2.50, we can rearrange the equation to solve for [H3O+]:

[tex]\[ [\text{H}_3\text{O}^+] = 10^{-\text{pH}} \] \[ [\text{H}_3\text{O}^+] = 10^{-2.50} \][/tex]

Now, we calculate the value:

[tex]\[ [\text{H}_3\text{O}^+] = 10^{-2.50} = 10^{0.50} \times 10^{-3} \] \[ [\text{H}_3\text{O}^+] = \sqrt{10} \times 10^{-3} \] \[ [\text{H}_3\text{O}^+] \approx 3.16 \times 10^{-3} \text{ M} \][/tex]

Therefore, the hydronium ion concentration, which is also the muriatic acid concentration, is approximately [tex]\(3.16 \times 10^{-3}\)[/tex]M when the pH is 2.50.

Answer:

The answer to your question is: 1.64 atm

Explanation:

Data

n = 3 moles

v = 60 l

T = 400 °K

P = ?

R = 0.082 atml/mol°K

Formula

PV = nRT   (ideal gas formula)

clear P from this equation

P = nRT/V    

P = 3(0.082)(400)/60 substitution

P = 98.4/ 60   process

P = 1.64 atm.    result

Answer:it depense.

Explanation: whether a solid to floats or sinks is determined by its density. If the solid is less dense than the liquid, it will float but if denser, it will sink. Whether the solid is known or not, as long as its density is greater than that of the liquid, it will definitely sink. But if it is lesser, it will definitely floats. Remember, density is simply mass over the volume m/v.

Archimedes' principle  find that the density of the body must be less than the density of the liquid for the body to float.

                         ρ_{body} < ρ _{liquid}

Archimeds' principle states that the thrust of a body in a fluid is equal to the weight of the desalted liquid. If we apply the equilibrium equation to a body in a liquid

              B- W = 0

              B = ρ g V_{liquid}

Where B is the thrust and w the weight of the body, ρ  the density of the liquid, g the acceleration of gravity and V the volume liquid

if we use the concept of density of the body

             ρ  = m / V

            W = ρ  g V

we substitute in the equilibrium equation

          ρ_{liquid}  V_{liquid} = ρ_{body} V_{body}

          [tex]\frac{V_{liquid}}{V_{body}} = \frac{\rho_{body}}{ \rho_{liquid}}[/tex]

this is the relationship for the body to float in the water

When analyzing this expression, if the density of the body is less than the density of the liquid, the body must float

One way to artificially create the density of the body to be less than that of the liquid is to increase the volume of the body by having a hollow part using the ratio

               ρ  = m / V

Consequently if increasing the volume of the body the density should decrease, this method is used by the ships.

In conclusion, using Archimedes' principle we find that the density of the body must be less than the density of the liquid for the body to float.

                         ρ_{body} < ρ _{liquid}

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Final answer:

To determine the grams of CO₂ produced in the reaction between C₆H₆ and O₂, we need to balance the chemical equation and use mole ratios.

Explanation:

To determine how much CO₂ will be produced in the reaction between C₆H₆ and O₂, we first need to balance the chemical equation:

2C₆H₆ + 15O₂ → 12CO₂ + 6H₂O

The balanced equation tells us that 2 moles of C₆H₆ react with 15 moles of O₂ to produce 12 moles of CO₂. To find the amount of CO₂ produced, we can use the given masses of C₆H₆ and O₂ to calculate their respective moles:

42.5 g C₆H₆ x (1 mol C₆H₆ / 78.114 g C₆H₆) = 0.544 mol C₆H₆

113.1 g O₂ x (1 mol O₂ / 32.00 g O₂) = 3.538 mol O₂

Since the mole ratio of C₆H₆ to CO₂ is 2:12, we can set up a proportion to find the moles of CO₂:

0.544 mol C₆H₆ x (12 mol CO₂ / 2 mol C₆H₆) = 3.264 mol CO₂

Finally, we can convert the moles of CO₂ to grams using its molar mass:

3.264 mol CO₂ x (44.009 g CO₂ / 1 mol CO₂) = 143.58 g CO₂

Therefore, 143.58 grams of CO₂ will be produced in this reaction.

The amount of CO2 produced by this reaction is 124.44 grams.

To solve this problem, we need to follow these steps:

1. Write down the balanced chemical equation for the combustion of benzene (C6H6).

2. Calculate the moles of C6H6 and O2 using their molar masses.

3. Determine the limiting reactant, which is the reactant that will be completely consumed first and thus limit the amount of product formed.

4. Use the stoichiometry of the balanced equation to calculate the mass of CO2 produced from the limiting reactant.

The balanced chemical equation for the combustion of benzene is:

[tex]\[ C_6H_6 + \frac{15}{2}O_2 \rightarrow 6CO_2 + 3H_2O \][/tex]

Calculate the moles of C6H6 and O2:

[tex]The molar mass of C6H6 is \( 6 \times 12.01 \, g/mol \, (C) + 6 \times 1.008 \, g/mol \, (H) = 78.11 \, g/mol \).[/tex]

The moles of C6H6 are:

[tex]\[ \frac{42.5 \, g}{78.11 \, g/mol} \approx 0.544 \, mol \][/tex]

The molar mass of O2 is [tex]\( 2 \times 16.00 \, g/mol = 32.00 \, g/mol \).[/tex]

The moles of O2 are:

[tex]\[ \frac{113.1 \, g}{32.00 \, g/mol} \approx 3.534 \, mol \][/tex]

Determine the limiting reactant:

From the balanced equation, the stoichiometric ratio of C6H6 to O2 is 1:15/2, which simplifies to 2:15 or 4:30. To react with 0.544 mol of C6H6, we would need:

[tex]\[ 0.544 \, mol \, C_6H_6 \times \frac{30}{4} = 4.08 \, mol \, O_2 \][/tex]

Since we only have 3.534 mol of O2, O2 is the limiting reactant.

Calculate the mass of CO2 produced:

From the balanced equation, the stoichiometric ratio of O2 to CO2 is 15/2:6. Therefore, the moles of CO2 produced are:

The molar mass of CO2 is [tex]\( 12.01 \, g/mol \, (C) + 2 \times 16.00 \, g/mol \, (O) = 44.01 \, g/mol \).[/tex]

The mass of CO2 produced is:

[tex]\[ 2.827 \, mol \, CO_2 \times 44.01 \, g/mol = 124.44 \, g \][/tex]

Answer:

The answer to your question is: 234.7 cans

Explanation:

data

caffeine concentration = 3.55 mg/oz

10.0 g of caffeine is lethal

there are 12 oz of caffeine in a can

Then

                    3.55 mg ----------------- 1 oz

                      x    mg  -----------------12 oz (in a can)

x = 42.6 mg of caffeine in a can

Convert it to grams 42,6 mg = 0.0426 g of caffeine in a can

Finally

            0.0426 g of caffeine ------------------  1 can

            10           g of caffeine -----------------    x

x = 10 x 1/0.0436 = 234.7 cans

Answer:

sodium is going to migrate the left to the right side through the membrane

Explanation:

Differences in concentration of sodium produce a movement of sodium through the membrane until reach the equilibrium

Answer:

A permeable membrane is a barrier that only allows certain particles to pass through them. Diffusion is a physical process whereby the particles move from a region of higher concentration to a region of lower concentration, and this movement occurs until the equilibrium is reached (same concentration in every region).

If the membrane is permeable to the sodium, it means that only sodium atoms will be able to migrate from one side to another. And according to difussion phenomenon, sodium atoms will migrate from the side with higher concentration to the side of lower concentration. So, a migration of sodium will occur from the left side of the beaker to the right side of the beaker until the concentration of sodium is the same in both sides.  

The limits of science include the available technology to test claims, the nature of repeated testing, and the scope of questions that can be empirically answered. Science cannot address non-empirical matters such as moral or spiritual questions.

One limit of science is the technology or tools available to test scientific claims. Science is based on empiricism and requires observable and measurable phenomena. Thus, current technological capabilities directly impact what can be empirically tested and confirmed. For example, without advanced microscopes, the intricate details of cell biology would remain obscured. Additionally, science is delimited in addressing questions that are not empirical or material, such as moral or spiritual questions that fall outside the scope of scientific inquiry.

Another core aspect of science is repeated testing, which ensures that scientific claims are reliable and valid. The replicability of scientific experiments by different researchers is essential to the scientific process, confirming the accuracy of results. Furthermore, scientific theories are never absolute; they are open to falsification and refinement when new evidence or observations challenge the existing understanding. This includes well-established theories, which may be adjusted or overturned in the light of fresh, inconsistent evidence.

Ultimately, science is limited in the types of questions it can answer. It cannot address non-material phenomena or provide definitive answers to questions about morality, aesthetics, or spirituality, as these are beyond empirical measurement and observation. Science deals with material phenomena of matter and energy, which can be observed and tested. The distinction between what is within and outside the scope of science is crucial in understanding its limitations.

Answer:

FeCl₂ → Fe²⁺ + Cl⁻

HNO₃ → H⁺ + NO₃⁻

(NH₄)₂SO₄ → NH₄⁺ + SO₄²⁻

Ca(OH)₂ → Ca²⁺ + OH⁻

Explanation:

Each of these given compounds will dissociate into cations and anions upon dissolution in water. The compounds and constituent species are tabulated as under:

Compound                                         Cation                             Anion

FeCl₂ (Ferrous chloride)                     Fe²⁺ (Ferrous)                Cl⁻ (Chloride)  

HNO₃ (Nitric acid)                               H⁺ (Hydron)                    NO₃⁻ (Nitrate)

(NH₄)₂SO₄ (Ammonium sulfate)         NH₄⁺ (Ammonium)         SO₄²⁻ (Sulphate)

Ca(OH)₂ (Calcium hydroxide)             Ca²⁺ (Calcium)               OH⁻ (Hydroxide)

Each of these compounds is made up of cations and anions but by convention while writing a chemical formula a cation is written first followed by an anion.

FeCl2 dissolves to form Fe2+ and Cl- ions, HNO3 dissolves to form H+ and NO3- ions, (NH4)2SO4 dissolves to form 2NH4+ and SO42- ions, and Ca(OH)2 dissolves to form Ca2+ and 2OH- ions.

FeCl2 dissolves in water to form these two types of ions: Fe2+ (iron(II) ion) and Cl- (chloride ion).

HNO3 dissolves in water to form these two ions: H+ (hydrogen ion) and NO3- (nitrate ion).

(NH4)2SO4 dissolves in water to form the three ions: 2NH4+ (ammonium ions) and SO42-  (sulfate ion).

Ca(OH)2 dissolves in water to form three ions: Ca2+ (calcium ion) and 2OH- (hydroxide ion).

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Answer:

BaI2

Explanation:

Hello, since the electronegativity of Barium and Iodine are 0.89 and 2.66, respectively, the difference is 1.77, so the bond is ionic.

Best regards.

The chemical formula which represents an ionic compound is BaI₂ s it has metal and non metal.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Answer:

A-  1 hydrogen, 1 oxygen, 1 chlorine

B-  2 Nitrogen,  4 hydrogen

C-  2 sodium, 2 oxygen

the last one i dont understand because im in middle school and i havent learned that... :/

Explanation:

Answer:

c. temperature and water vapor content.

Explanation:

The density of any substance is dependent of temperature, and in gases, the variations is greater than in any other substance, therefore, temperature is very important to calculate air density. Also, the concentration of water vapor in the air can vary depending  where is located, and that concentration will affect the density because it affects the average mass of air.

Answer:

c. temperature and water vapor content is the correct answer.

Explanation:

temperature and water vapor content are the two most important in determining the density of air.

When the temperature gets increase it results in the increase of volume and density gets decreases.

Temperature is an important factor to determine the air density.

The concentration of water vapor in the air change depending on where it is placed and so when water vapor is added it will change the density of air because it changes the average mass of air and density gets decrease.

Answer:

ΔG° = –7.4 kcal/mole

Explanation:

When there are coupled reactions taking place, we can say that their free energy variations are additive. Meaning that if there is a reaction A → B followed by B → C, each reaction will have its own free energy variation, ΔG°₁ and ΔG°₂. As both reactions are secuential, there is a global reaction taking place, which is A → C. This global reaction also has its own free energy variation, ΔG°total, which represents the sum of the individual free energy variations of the coupled reactions, ΔG°₁ +  ΔG°₂ = ΔG°total.

For this case we have, in the first reaction of glycolysis, there are two coupled reactions that take place:

(1) glucose + Pi → glucose 6-phosphate + H₂O

(2) ATP + H₂O → ADP + Pi

We know that the total variation of free energy for that reaction is:

ΔG°total =  –4.06 kcal/mole

But the individual variations of free energy, ΔG°₁ and ΔG°₂, are unknown, so we can propose the next equation:

ΔG°₁ + ΔG°₂ = –4.06 kcal/mole

Then we have another value given to us, the variation of free energy of the reversed first reaction (1), which would be:

(3) glucose 6-phosphate → glucose + Pi

ΔG°₃ = –3.34 kcal/mole

As this reaction is the reversed reaction of the first one (1), we can assume the next:

ΔG°₁  = (–1) * (ΔG°₃) = (–1) * (–3.34 kcal/mole) = 3.34 kcal/mole

So now that we have the value of ΔG°₁ we can substitute it in the proposed equation to find out the value of ΔG°₂ :

ΔG°₁ + ΔG°₂ = –4.06 kcal/mole

ΔG°₂ = –4.06 kcal/mole – ΔG°₁

ΔG°₂ = –4.06 kcal/mole – 3.34 kcal/mol

ΔG°₂ = –7.4 kcal/mole

So there it is, that is the value of the variation of free energy of the second reaction (2), which is the hydrolisis of ATP.

Final answer:

The ΔG° for hydrolysis of ATP to ADP and Pi, considering the ΔG° values given for the phosphorylation and dephosphorylation of glucose, is -7.40 kcal/mole.

Explanation:

The student asked for the ΔG° for the hydrolysis of ATP. In enzymatic reactions, the ΔG° of the reverse reaction is the negative of the ΔG° of the forward reaction. Given that hexokinase catalyzes the phosphorylation of glucose to glucose 6-phosphate with a ΔG° of -4.06 kcal/mole and the reverse reaction, catalyzed by glucose 6-phosphatase, has a ΔG° of -3.34 kcal/mole, we can find the ΔG° for hydrolysis of ATP by adding these two values (because to find the overall ΔG° for a coupled reaction, you sum the ΔG° values of the individual steps). The sum of -4.06 kcal/mole and -3.34 kcal/mole is -7.40 kcal/mole, which is the ΔG° for the hydrolysis of ATP to ADP and Pi.

Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released from the combustion of 24.3 g benzene is 976.229 kJ.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

Amount of heat produced in this case

In this case, the balanced reaction is:

2 C₆H₆ + 15 O₂ → 12 CO₂ + 6 H₂O

and the enthalpy reaction ∆H° has a value of -6278 kJ.

This equation indicates that when 2 moles of C₆H₆ reacts with 15 moles of O₂, 6278 kJ of heat is released.

You need to know the amount of heat produced from the combustion of 24.3 g benzene (C₆H₆). Knowing that the molar mass of benzene is 78.11 g/mole, the number of moles of benzene reacting in the combustion is:

[tex]24.3 grams\frac{1 mole}{78.11 grams}[/tex]= 0.311 moles

So, when 0.311 moles of benzene are burned, then you can apply the following rule of three: if 2 moles of C₆H₆ releases 6278 kJ of heat, 0.311 moles of C₆H₆ releases how much heat?

[tex]heat=\frac{0.311 moles x6278 kJ}{2 moles}[/tex]

heat= 976.229 kJ

Finally, the quantity of heat released from the combustion of 24.3 g benzene is 976.229 kJ.

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Answer:

D. All of these

Explanation:

Hi,

So, let's go,

The first thing to know, is that strong acids has a lot of H+ free in solution. While weak acids doesn't have a lot of H+ free.

Now, analyzing the letters

A. Electrical current conduction has a lot of free electrons, so, strong acids has a lot of H+ free in solution too. The combination of these two, in large amount, results in a strong reaction. Very differently with weak acids, which has a few free electrons.

B. ph paper test works with a scale of colors. This means that at one end the acid is strong, and at the other the acid is weak. So, if you drip a drop of the strong acid, the ph paper test will show you different color that when you drop a weak acid.

c. Magnesium is an element from IIA family, that means he reacts strongly with electrons and íons. Which is the cafe os strong acids.

I hope that all questions is solved.

Bye! See ya

Answer: The osmotic pressure is 54307.94 Torr.

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

[tex]\pi=iCRT[/tex]

where,

[tex]\pi[/tex] = osmotic pressure of the solution = ?

i = Van't hoff factor = 3

C = concentration of solute = 0.958 M

R = Gas constant = [tex]62.364\text{ L Torr }mol^{-1}K^{-1}[/tex]

T = temperature of the solution = [tex]30^oC=[30+273]K=303K[/tex]

Putting values in above equation, we get:

[tex]\pi=3\times 0.958mol/L\times 62.364\text{ L. Torr }mol^{-1}K^{-1}\times 303K\\\\\pi=54307.94Torr[/tex]

Hence, the osmotic pressure is 54307.94 Torr.

Final answer:

The osmotic pressure of the 0.958 M solution is 23.96 atm.

Explanation:

The osmotic pressure of a solution can be calculated using the formula II = MRT, where II is the osmotic pressure, M is the molarity of the solution, R is the gas constant (0.08206 L atm/mol K), and T is the temperature in Kelvin. In this case, we have a 0.958 M solution with a volume of 6.00 L at a temperature of 30 °C. To convert the temperature to Kelvin, we add 273 to get 303 K. Substituting the values into the formula, we get:

II = (0.958 M) (0.08206 L atm/mol K) (303 K)

II = 23.96 atm

Therefore, the osmotic pressure of the solution is 23.96 atm.

Answer:

The answer to your question is: letter c (96%)

Explanation:

Indium -113 (112-9040580 amu) ₁₁₃In

Indium-115 (114.9038780 amu)  ₁₁₅In

Atomic mass of Indium is 114.82 amu ₁₁₄.₈₂In

Formula

Atomic mass = m₁(%₁) +m₂(%₂)  / 100

%₁ = x I established this is an equation

%₂ = 100 - x

Substituting values

114.82 = 112.8040x + 114.9039(100-x) /100    and know we expand and simplify

114.82 = 112.8040x + 11490.39 - 114.9039x  /100

11482 = 112.8040x -114.9039x +11490.39

11482 - 11490.39 = 112.8040x -114.9039x

-8.39 = -2.099x

x = 3.99

Then % of Indium-115 = 100 - 3.99 = 96

c)95.7%

Indium -113 (112-9040580 amu) ₁₁₃In

Indium-115 (114.9038780 amu)  ₁₁₅In

Atomic mass of Indium is 114.82 amu ₁₁₄.₈₂In

Formula to be used to calculate the percentage for isotopes will be:

Atomic mass = m₁(%₁) +m₂(%₂)  / 100

%₁ = x

%₂ = 100 - x

On substituting the values:

[tex]114.82 = \frac{112.8040x + 114.9039(100-x)}{100} \\\\ 114.82 = \frac{ 112.8040x + 11490.39 - 114.9039x }{100} \\\\ 114.82 = 112.8040x -114.9039x +11490.39\\\\ 114.82 - 11490.39 = 112.8040x -114.9039x\\\\ -8.39 = -2.099x\\\\ x = 3.99 [/tex]

Thus, % of Indium-115 = 100 - 3.99 = 96%.

Therefore, the correct option is c.

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Answer:

B. binds to the tryptophan repressor when the repressor is bound to tryptophan.

Explanation:

Bacterial genes are commonly composed of operons that are activated or deactivated depends on the needed. If the bacteria need, for example, an amino acid such as tryptophan for synthesizing proteins. An activator "turns on" the transcription that the operon has and produces the amino acid.

On the other hand, if the bacteria have a high presence of tryptophan amino acid, a repressor binds to the tryptophan operator and avoids the amino acid transcription, in consequence, constrain the tryptophan production.

The tryptophan operator binds to the tryptophan repressor when the repressor is bound to tryptophan. It plays a significant role in the expression and regulation of the trp operon, which is responsible for the synthesis of tryptophan in E. coli. The operator's function is determined by the presence or absence of tryptophan in the cell.

The tryptophan operator B. binds to the tryptophan repressor when the repressor is bound to tryptophan. This reaction happens when tryptophan accumulates in the cell. The accumulation triggers two tryptophan molecules to bind to the trp repressor molecule, allowing it to bind to the trp operator. Subsequently, the binding of the trp repressor to the operator blocks RNA polymerase from transcribing the genes, which stops the expression of the operon. Furthermore, there exists a DNA sequence known as the operator sequence that is encoded between the promoter region and the first trp coding gene. This sequence contains the DNA code to which the repressor protein can bind.

It's also essential to note that the tryptophan operator plays a crucial role in regulating the synthesis of tryptophan in the bacteria E. coli via the trp operon. When tryptophan is not present in the cell, the repressor does not bind to the operator; thus allowing the operon to actively synthesize tryptophan. On the other hand, the presence of tryptophan in the cell leads to the activation of the repressor, causing it to bind to the operator and block gene transcription.

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An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu. 207.2 amu is the average atomic mass. The element is lead.

The average atomic mass, also known as atomic weight, is the weighted average of all the masses of an element's naturally occurring isotopes. Isotopes are identical atoms with differing numbers of neutrons in their nuclei, resulting in slightly different atomic weights. The average atomic mass is reported in atomic mass units (amu) and is frequently used in real-world applications to describe the mass of an element.

If element X has 50% of an isotope with a mass of 10 and 50% of an isotope with a mass of 20,

0.5(50%)× 10 + 0.5(50%)× 20 = 15

0.014(1.4%) × 203.973 + .241(24.1%) ×205.9745 + 0.221(22.1%) × 206.9758 + 0.52.4(52%) ×207.9766 = 207.2 amu

The element is Pb.

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The average atomic mass of the element is approximately 207.266 amu, and the element is Lead (Pb).

The average atomic mass of the element can be calculated by multiplying the mass of each isotope by its percentage abundance (expressed as a decimal) and summing these products. The calculation is as follows:

Average atomic mass = (203.973 amu  ×  0.0140) + (205.9745 amu  × 0.2410) + (206.9759 amu  × 0.2210) + (207.9766 amu  ×  0.5240)

Now, let's perform the calculations:

= (203.973 × 0.0140) + (205.9745  ×  0.2410) + (206.9759 × 0.2210) + (207.9766 × 0.5240)

= 2.85562 amu + 49.659945 amu + 45.783419 amu + 108.9668704 amu

= 207.265854 amu

Therefore, the average atomic mass of the element is approximately 207.266 amu.

To identify the element, we can refer to the periodic table and look for an element with this average atomic mass. The element with an average atomic mass close to 207.266 amu is Lead (Pb).

In conclusion, the average atomic mass of the element is approximately 207.266 amu, and the element is Lead (Pb).