Which aqueous solution has the lowest freezing point c6h12o6, c2h5oh, ch3cooh, or nacl?

Answers

Answer 1
Depression of a freezing point of the solutions depends on the number of particles of the solute in the solution.
1 mol of C6H12O6 after dissolving in water still be 1 mol, because C6H12O6 does no dissociate in water.
1 mol of C2H5OH after dissolving in water still be 1 mol, because C2H5OH does no dissociate in water.
1 mol of NaCl after dissolving in water gives 2 mol of particles (ions), because NaCl is a strong electrolyte(as salt) and completely dissociates in water.
NaCl ----->Na⁺ + Cl⁻
1 mol of CH3COOH after dissolving in water gives more than 1 mol but less than 2 moles, because CH3COOH is a weak electrolyte (weak acid) and dissociates  only partially. 

So, most particles of the solute is going to be in the solution of NaCl, 
so the lowest freezing point has the aqueous solution of NaCl.
Answer 2

Among C₆H₁₂O₆, C₂H₅OH, CH₃COOH, and NaCl, NaCl is the one that will provide the aqueous solution with the lowest freezing point.

We have 4 aqueous solutions and we want to determine which has the lowest freezing point.

C₆H₁₂O₆C₂H₅OHCH₃COOHNaCl

What is the freezing point depression?

Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

We can calculate the freezing point depression (ΔT) using the following expression.

ΔT = Kf × b × i

where,

Kf is the cryoscopic constant for water.b is the molality of the solution.i is the Van't Hoff factor.

Assuming all the solutions have the same molality, the freezing point depression will be a function of the van't Hoff factor.

What is the van't Hoff factor?

The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.

For non-electrolytes, such as C₆H₁₂O₆ and C₂H₅OH, i = 1. Comparing NaCl and CH₃COOH, we can determine that i(NaCl) > i(CH₃COOH) because NaCl is a strong electrolyte and CH₃COOH a weak one.

Thus, NaCl, with the highest Van't Hoff factor, will have the lowest freezing point.

Among C₆H₁₂O₆, C₂H₅OH, CH₃COOH, and NaCl, NaCl is the one that will provide the aqueous solution with the lowest freezing point.

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Related Questions

Which type of solute is present in aqueous solution predominantly as hydrated ions rather than as molecules?

Answers

Answer is: strong electrolyte.

Strong electrolytes better separates into particles (ions) in water because of their ionic bond.

For example sodium chloride is ionic compound and strong electrolyte and dissociates in water on hydrated sodium cations and chlorine anions:

NaCl(aq) → Na⁺(aq) + Cl⁻(aq).


Final answer:

The type of solute that predominantly exists as hydrated ions in an aqueous solution includes salts with small, highly charged ions like Mg²⁺, Al³⁺, SO₄²⁻, and PO₄³⁻. These ions are stabilized in solution through hydration by water molecules due to the polar nature of water, making it a powerful solvent for ionic compounds.

Explanation:

The type of solute that is present in an aqueous solution predominantly as hydrated ions rather than as molecules is typically composed of salts containing small, highly charged ions such as Mg²⁺, Al³⁺, SO₄²⁻, and PO₄³⁻. These ions have a greater tendency to form ion pairs due to strong electrostatic interactions, but in aqueous solutions, they are often found as hydrated ions surrounded by a shell of water molecules. Hydration helps to stabilize these solutions by preventing the positive and negative ions from reassociating and precipitating. This process is critical for understanding the behaviors of electrolytic solutions, where salt dissolves in water and dissociates into its component ions, leading to the formation of solvated ions which can conduct electricity.

The stabilization of ions in solution through hydration is fundamental to many chemical processes, including reactions in aqueous solutions and the biochemical activities inside cells. The water molecules' ability to surround and stabilize ions is largely due to the polar nature of water, arising from the differences in electronegativity between hydrogen and oxygen. This property makes water an excellent solvent for ionic compounds.

Object A has a density of 10 g/cm3 and a mass of 9 g. Object B has a density of 10 g/cm3 and a mass of 4 g. Which object has a greater volume and by how much?

Answers

mass=Density * volume
volume=mass/Density
volume A=mass A/Density A=9g/10g/cm³=0.9 cm³

volume B=mass B/Density B=4g/10g/cm³=0.4 cm³

0,9 cm³>0.4 cm³
volume A>volume B

Which compound is most likely to have a sweet smell? which compound is most likely to have a sweet smell? ch3−ch2−nh2 o∥ch3−c−o−ch3 ch3−ch2−o−ch3 ch3−ch2−ch2−oh?

Answers

The compound that will have a sweet smell would be the one, whereby the molecular formula closely resembles that of an ether

R-O-R.

I believe the third one

Compounds are substances made up of similar molecules with atoms of various elements. The atoms of two or more elements form bonds and combine to yield a compound.

[tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex]  will have a sweet smell.

What are the functional groups?

Functional groups are specific atoms or molecules bonded with the compound that gives a characteristic property to a compound. Some examples are alcohols, amines, ethers, carboxylic acids etc.

Ether [tex]\rm (R-O-R^{'})[/tex]  is one of the functional groups with a sweet and pleasant smell that is a volatile and flammable compound and is used in solvent and other industrial processes.

The compound [tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex] is ether as it has the general formula of ether where the oxygen is linked with two different groups on its two sides.

Therefore, option C. [tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex]  is the sweet-smelling compound.

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there is a total of seventeen constitutional isomers for the molecular formula c5h13n. draw the skeletal formula of all three constitutional isomers that are tertiary amines.

Answers

Final answer:

The skeletal formulae for the three tertiary amines according to the molecular formula C5H13N are N(CH3)3, N(CH3)(C2H5), and N(CH3)(C3H7). These demonstrate the concept of constitutional isomerism in organic chemistry.

Explanation:

Tertiary amines are those amines in which the nitrogen atom is bonded to three organic groups. In the context of the given molecular formula - C5H13N - the three constitutional isomers that are tertiary amines can be represented as follows:

N(CH3)3: The nitrogen atom here is bonded to three methyl groups. N(CH3)(C2H5): Here, the nitrogen atom is bonded to two methyl groups and one ethyl group. N(CH3)(C3H7): In this case, the nitrogen atom is bonded to one methyl group and one propyl group.

To draw these, remember that each carbon atom is at the end of each branch and the N indicates the central nitrogen atom. The formation of these distinct structures from the same molecular formula demonstrates the concept of constitutional isomerism in organic chemistry.

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30 ml of 0.3 M NaOH are required to titrate H3PO4 to the equivalence point.How many moles of H3PO4 are needed to reach the equivalence point. Show steps please :)

Answers

the balanced equation for the above reaction is as follows;
3NaOH + H₃PO₄ ---> Na₃PO₄ + 3H₂O
stoichiometry of NaOH to H₃PO₄ is 3:1
the number of NaOH moles in the solution - molarity x volume 
number of NaOH moles - 0.3 mol/L x 0.030 L = 0.009 mol
for complete neutralisation 
3 mol of NaOH requires 1 mol of H₃PO₄
therefore 0.009 mol of NaOH requires - 1/3 x 0.009 = 0.003 mol of H₃PO₄
therefore 0.003 mol of H₃PO₄ are needed to reach the equivalence point 

The number of moles of H₃PO₄ needed to reach the equivalence point is 0.009 moles.

To find the number of moles of H₃PO₄ required to reach the equivalence point, we need to understand the stoichiometry of the reaction between NaOH and H₃PO₄. The balanced chemical equation for the reaction is:

[tex]\[ H_3PO_4 + 3NaOH \rightarrow Na_3PO_4 + 3H_2O \][/tex]

From the equation, we see that one mole of H₃PO₄ reacts with three moles of NaOH. Now, we are given that 30 ml of 0.3 M NaOH is required to titrate H₃PO₄ to the equivalence point.

First, we calculate the number of moles of NaOH used in the titration:

[tex]\[ \text{Moles of NaOH} = \text{Volume of NaOH (L)} \times \text{Molarity of NaOH} \][/tex]

Since the volume is given in milliliters, we need to convert it to liters:

[tex]\[ 30 \text{ ml} = 30 \times 10^{-3} \text{ L} \][/tex]

Now, we can calculate the moles of NaOH:

[tex]\[ \text{Moles of NaOH} = 30 \times 10^{-3} \text{ L} \times 0.3 \text{ M} \] \[ \text{Moles of NaOH} = 0.009 \text{ moles} \][/tex]

Since the stoichiometry of the reaction is 1 mole of H₃PO₄ to 3 moles of NaOH, the moles of H₃PO₄ required for the reaction is one-third of the moles of NaOH:

[tex]\[ \text{Moles of H}_3\text{PO}_4 = \frac{1}{3} \times 0.009 \text{ moles} \]\[ \text{Moles of H}_3\text{PO}_4 = 0.003 \text{ moles} \][/tex]

To react with all of the NaOH provided, we need three times this amount of H₃PO₄:

[tex]\[ \text{Moles of H}_3\text{PO}_4 = 0.003 \text{ moles} \times 3 \]\[ \text{Moles of H}_3\text{PO}_4 = 0.009 \text{ moles} \][/tex]

Therefore, 0.009 moles of H₃PO₄ are needed to reach the equivalence point with 30 ml of 0.3 M NaOH.

Sodium chlorite -> sodium chloride + oxygen what type of chemical reaction is represented by this equation

Answers

5ONaClO2+4HCl═4ClO2+5NaCl+2H2O

Which of the following statements is correct?
A. A rock will weigh more on the moon than on Earth.
B. A rock will weigh more on Earth than on the moon.
C. A rock will have more mass on Earth than on the moon.
D. A rock will have more mass on the moon than on Earth.

Answers

The answer is B.

B: A rock will weigh more on Earth than on the moon.

Moon's gravity is less than Earth's, this means that objects weigh less on the moon then they do on earth. 

plz give me brainliest :)

The correct statement from the given list of statements would be a rock will weigh more on Earth than on the moon, therefore the correct answer is option B.

What is Newton's second law?

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change in momentum.

The weight of any object uses the multiplication of the Mars and the gravity of the respective planet in our case the weight is measured with respect to the gravity of the earth

Weight  = Mass × (acceleration due to gravity)

As given in the problem mem we have to find the correct statement from the given list of the statements.

The acceleration due to gravity is greater on the earth as compared to the moon.

Thus, a rock will weigh more on Earth than on the moon, therefore the correct answer is option B.

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The physical state of nearly all ionic compounds at room temperature

Answers

The physical state of nearly all ionic compounds at room temperature IS SOLID.

Ionic compounds are generally solid at room temperature with high melting and boiling points. They are water soluble and can conduct electricity when melted or dissolved in water.

The physical state of nearly all ionic compounds at room temperature is solid. These substances are generally made up of a representative unit comprising a metal cation and a nonmetal anion arranged in a crystal lattice structure. Ionic compounds, such as sodium chloride, have high melting and boiling temperatures, indicating that a significant amount of energy is required to break the ionic bonds within the crystal lattice. For instance, sodium chloride melts at 801 0C and boils at 1413 0C.

These compounds are typically water soluble, which means they can dissolve in water, dissociating into their respective ions. Furthermore, ionic compounds in solid form do not conduct electricity, but they become electrically conductive when melted or dissolved in water, as the ions are free to move.

A chemical is classified as being volatile if it is __________.

Answers

A chemical is classified as being volatile if it is readily evaporated at room temperature.  Volatility is related to a substance's vapor pressure. At a given temperature, a substance with higher vapor pressure vaporizes more readily than a substance with a lower vapor pressure.

6. Which of the following chemical reactions is most likely to have the largest equilibrium constant K?

CH3COO- (aq) + H2O(l) = CH3COOH(aq) + OH-(aq)

HCl(aq) + H2O(l) = H3O+(aq) + Cl-(aq)

CH3COOH(aq) + H2O(l) = CH3COO- (aq) + H3O+(aq)

H3PO4(aq) + NH3(aq) = H2PO4-(aq) + NH4+(aq)

Answers

The answer to this question is HCl(aq) + H2O(l) = H3O+(aq) + Cl-(aq). HCl is considered a strong acid meaning it is 100% ionized in solution. The equilibrium constant is therefore very large.

Which statement describes a 0.01 M LiOH( aq) solution?

a. The solution is basic with a pH less than 7.
b. The solution is acidic with a pH greater than 7.
c. The solution is acidic with a pH less than 7.
d. The solution is basic with a pH greater than 7.

Answers

Before answering the question, one should first calculate the pH for given concentration of LiOH.

As LiOH ionizes as,

                                 LiOH    →     Li⁺  +  OH⁻

So, the concentration of OH⁻  =  [OH⁻]  =  0.01
Also,
                               pOH  =  -log [OH⁻]

                               pOH  =  -log [0.01]

                               pOH  =  2
Whereas,
                               POH  +  pH  =  14
Or,
                               pH  =  14 - 2

                               pH  =  12
Result:
           
As pH is greater than 7, so the solution is Basic.
Final answer:

The 0.01 M LiOH solution is a basic solution as LiOH is a strong base. This solution has a pH value greater than 7.

Explanation:

The solution of 0.01 M LiOH (Lithium hydroxide) in water is basic, not an acidic one. This is because LiOH is a strong base that dissociates fully in water forming OH- ions, and these ions cause the pH of the solution to be greater than 7. Hence, the correct statement is d. The solution is basic with a pH greater than 7.

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When iocnic solids dissolve in water, the break down into the ____ ions (cations) and ___ ions (anions) that they contain?

Answers

what are the answers

Two cars, car A and car B, have equal mass. Which car has the greater kinetic energy if both cars have the same velocity?

Answers

theyre the same amount of kinetic energy

According to law of conservation of mass, equal masses have the same velocity, hence both the cars have the same velocity.

What is law of conservation of mass?

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.In chemical reactions, mass is always conserved.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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The molar mass of I2 is 253.80 g/mol and the molar mass off NI3 is 394.71 g/mol. how many moles of I2 will form 3.58 g of NI3

Answers

the balanced equation for the above reaction is as follows;
N₂ + 3I₂ --> 2NI₃
stoichiometry of I₂ to NI₃ is 3:2
mass of NI₃ formed - 3.58 g
The number of NI₃ moles formed - 3.58 g / 394.71 g/mol = 0.00907 mol
according to molar ratio,
when 2 mol of NI₃ is formed - 3 mol of I₂ reacts
therefore when 0.00907 mol is formed - 3/2 x 0.00907 mol = 0.0136 mol of I₂
mass of I₂ reacted - 0.0136 mol x 253.80 g/mol  = 3.45 g
therefore mass of I₂ formed - 3.45 g

The moles of I₂ that will form 3.58 g of  NI₃ is  0.0135 moles

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Molar mass of I₂ = 253.8 g/mol

Molar mass of NI₃ = 394.71 g/mol

N₂ + 3I₂ = 2NI₃

Mass of NI₃ = 3.58g

Moles of NI₃ = mass / molar mass

= 3.58 / 394.71

= 0.009 moles

from the reaction, 2 moles of NI₃ need 3 moles of I₂

1 mole of NI₃ will need 3/2 moles of I₂

So, 0.009 moles of NI₃ will need = 1.5 × 0.009 = 0.0135 moles of  I₂

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what is fry's reagent used for?

Answers

Fry's Reagent a chemical used on metals such as firearms, it corrodes them and allows you to see the etching that could have been scratched off by the criminal, such as the serial number of the gun.  It is a chemical that can restore a serial number that has been removed from a gun by dissolving the area that has been flattened when the number was stamped on.

Fry's reagent is a chemical tool used to detect aldehydes through a color change to bright magenta, offering a simple and fairly reliable test for the presence of these functional groups in various chemical applications.

Fry's reagent is a chemical reagent commonly used in a method to detect aldehydes. It consists of a decolorized fuchsin dye that can be activated by sulfur dioxide. When Fry's reagent comes into contact with aldehydes, it will cause a color change to bright magenta, indicating the presence of these functional groups. This method is known for its simplicity and reliability, although it is important to note that it might not always produce clear-cut results as anticipated.

Detecting aldehydes is crucial in various applications, such as confirming the presence of specific biomolecules in biochemistry or determining the purity of chemical compounds in synthetic chemistry. The color change of Fry's reagent provides a visual cue that can be quickly interpreted by researchers.

Renewable resources are those that can be synthesized by humans. True or False?

Answers

False because they are resources that are created repeatedly by nature so it doesn't end. For example solar or wind energy.

Answer:

False

Explanation:

But with proper argument both sides have a point. Yes, the earth naturally makes there energy sources, but with out human motivation and work ethic we wouldn't have the power to harness the energy and use it in our every day lives. But the answer is FALSE

The plant structure that helps transport water and nutrients from the roots to the leaves and other parts of the plant is



A. stamen


B. xylem


C. pistil


D. phloem

Answers

B- Xylem is the correct answer

The answer to your question is Xylem

Determine whether heating or cooling takes place during each process, freezing, evaporation, condensation, melting sublimation, and deposition.

Answers

Answer :

Heating takes place during the process of Evaporation, Melting, Sublimation.

Cooling takes place during the process of Freezing, Condensation, Deposition.

Explanation :

Heating : It means thermal energy releases.

Cooling : It means thermal energy absorbs.

Evaporation : It is a type of vaporization process in which a liquid changes into gas phase by providing heat.

Melting : It is a process in which a solid changes into liquid phase by providing heat.

Sublimation : It is a process in which a solid changes directly into gas phase without passing through a liquid phase.

Freezing : It is a process in which a liquid transform into a solid phase at low temperature.

Condensation : It is a process in which a water vapor(gas) changes into liquid state at low temperature.

Deposition : It is a process in which a gas transforms directly into a solid phase without passing through a liquid phase.


Answer:

Heating: evaporation, melting, sublimation

Cooling: condensation, freezing, deposition

In the compound cah2 calcium has an oxidation number of 2+ and hydrogen has an oxidation number of

Answers

The oxidation number of H is -1.

Sum of the oxidation numbers in each element = charge of the complex

CaH₂ has 1 Ca atom and 2H atoms. The charge of the complex is zero. Let’s say Oxidation number of H is "a".

Then,

    (+2) + 2 x a = 0

        +2  + 2a  = 0

                  2a = -2

                    a = -1

Hence, the oxidation number of Hydrogen atom in CaH₂ is -1


Final answer:

In the compound CaH2, calcium has an oxidation number of +2, and hydrogen has an oxidation number of -1, balancing the charges. The oxidation states of elements in a compound like CaH2 influence their properties and reactivity.

Explanation:

In the compound CaH2, calcium has an oxidation number of +2 and hydrogen has an oxidation number of -1.

Hydrogen usually has an oxidation number of +1 except when bonded to metals in hydrides where it is -1. This is the case in compounds like CaH2.

Each hydrogen atom in CaH2 carries a charge of -1, balancing with the +2 charge of calcium to maintain overall charge neutrality.

How much energy must be absorbed by 20.0 grams of water to increase its temperature from 283 c to 303 c in joules. How do you work this out

Answers

Final answer:

To calculate how much energy 20 grams of water needs to increase its temperature from 283 °C to 303 °C, we can use the Heat Transfer equation. After converting the temperature to Kelvin and performing the calculation, we find that the water needs to absorb 1673.6 Joules of energy.

Explanation:

To calculate how much energy must be absorbed for water to increase its temperature, we can use the formula for Heat Transfer: Q = mcΔT. Where Q is the heat transferred, m is the mass of the object (water in this case), c is the specific heat capacity of the substance, and ΔT is the change in temperature. For water, the specific heat capacity (c) is 4.184 J/g °C.

First, we need to convert the temperature from Celsius to Kelvin by adding 273 to each temperature: 283 °C becomes 556 K and 303 °C becomes 576 K. The change in temperature (ΔT) is the final temperature minus the initial temperature (576 K - 556 K = 20 K).

Therefore, the heat equation becomes: Q = (20 g)(4.184 J/g °C)(20 K).

Calculating this gives Q = 1673.6 Joules. So, the water needs to absorb 1673.6 Joules of energy to increase its temperature from 283 °C to 303 °C.

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Final answer:

The energy required to increase the temperature of 20 grams of water from 283°C to 303°C can be calculated using the specific heat formula. By inserting the known values into the formula, it was determined that the process requires an input of 1673.6 Joules.

Explanation:

To work out the energy absorbed by water to increase its temperature, you need to use the heat capacity or specific heat formula q = mcΔT. Here, 'q' is the heat energy absorbed or released, 'm' is the mass of the substance, 'c' is the specific heat, and 'ΔT' is the change in temperature.

In the question, the mass 'm' is 20 grams of water, and the change in temperature 'ΔT' is the difference between final and initial temperatures, 303°C - 283°C = 20°C. From the reference provided, the specific heat 'c' for water is 4.184 J/g °C. Substituting these values into the formula, we get:

q = (20 g) x (4.184 J/g °C) x (20 °C) = 1673.6 J.

Therefore, 1673.6 Joules of energy must be absorbed by 20.0 grams of water to increase its temperature from 283°C to 303°C.

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Write the equation for the dissolution of sr(no3)2 in water. how many moles of strontium ions and nitrate ions are produced by dissolving 0.5 mol of strontium nitrate?

Answers

                                    Sr(NO3)2 ---> Sr²⁺ +       2 NO3⁻
from the reaction         1 mol            1 mol           2 mol
from the problem         0.5 mol         0.5 mol        1 mol

Answer: Moles of strontium and nitrate ions formed by dissolving 0.5 moles of strontium nitrate in water are 0.5 moles and 1 mole respectively.

Explanation:

We are given a chemical compound known as strontium nitrate having chemical formula [tex]Sr(NO_3)_2[/tex]. This is an ionic compound and when it is dissolved in water, it will dissociate into its respective ions.

We are given:

Moles of strontium nitrate = 0.5 moles

The chemical equation for the ionization of strontium nitrate follows:

[tex]Sr(NO_3)_2(aq.)\rightarrow Sr^{2+}(aq.)+2NO_3^-(aq.)[/tex]

By Stoichiometry of reaction:

1 mole of strontium nitrate produces 1 mole of strontium ions and 2 moles of nitrate ions.

So, 0.5 moles of strontium nitrate will produce = [tex](1\times 0.5)=0.5mol[/tex] of strontium ions and [tex](2\times 0.5)=1mol[/tex] of nitrate ions.

Hence, moles of strontium and nitrate ions formed by dissolving 0.5 moles of strontium nitrate in water are 0.5 moles and 1 mole respectively.

which energy source has been developed and improved by chemist

Answers

nuclear hope this helps

                                                                                             

Answer:

Nuclear energy

Explanation:

There are many sources of energy available in nature which are harnessed by humans for their use. Some of these sources are present in abundant quantity (solar energy) while others take million of years to renew (coal and petroleum).

Nuclear energy is generated when two nuclei fuse into a larger nuclei (nuclear fusion) or a large nuclei dissociates into smaller ones (nuclear fission) .

A small quantity of nuclear fuel produces a large amount of energy. It is difficult to control the energy production process on which chemist hve worked. Also, the disposal of radioactive waste produced was also a challenge.

A(n) ________ is the simplest form of lipid; it is a carbon chain, flanked by hydrogens, with an acid group at one end and a methyl group at the other end.

Answers

Answer:
            Fatty Acid is the simplest form of lipid.

Explanation:
                   Fatty acids are in fact carboxylic acids which has long aliphatic chains ranging from 4 carbons to 28 carbons in length. These fatty acids either are saturated or unsaturated. Triglycerides are formed when fatty acids get condense with glycerol. Those triglycerides which contain unsaturated fatty acids exist as Oils and those containing  saturated fatty acids forms Fats.

Final answer:

A fatty acid is the simplest form of lipid, consisting primarily of a carbon-hydrogen chain with an acid group on one end and a methyl group on the other.

Explanation:

A fatty acid is the simplest form of lipid. It consists mainly of chains of carbon and hydrogen atoms. At one end of this chain, there is an acid group (carboxylic acid), and at the other end, there is a methyl group. Fatty acids can exist alone or as monomers of larger lipid molecules such as triglycerides.

There are two types of fatty acids: saturated fatty acids, where the carbon chain is fully attached to hydrogen atoms since the carbons are connected by single bonds; and unsaturated fatty acids, where the carbon atoms are not bonded to as many hydrogen atoms as they possibly could be due to the presence of double or triple bonds between some adjacent carbon atoms.

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?

A) Solid melts.
B) Heat is given off.
C) Substance dissolves
D) Substance changes shape.

Answers

the answer would be (B), Heat is given off.






Hope that helps!!!!

the answer is b i just got it right on usatestprep

Question 3 given that au-197 is the only natural isotope of gold, what is the mass of one au atom and the mass of avogadro's number of au atoms, respectively? 196.97 g and 196.97 amu 197 amu and 197 g 197 g and 197 amu 196.97 amu and 196.97 g none of the above

Answers

The mass of one Au atom is 196.97 amu from periodic table and the mass of Avogadro's number of Au atoms is 196.97 g due to this is the mass of one mole of gold

Explanation:

The mass number of an element is a weighted average of all the isotopes of that element.

If Au has only one isotope then the atomic weight of that isotope matches the mass number.

Au-197 ==> mass number 197

Mass of one atom=mass number 197 amu

Mass of one mol of atoms:

[tex]m=197 amu*1.66054*10^{-24}g/amu*6.022*10^{23}[/tex]

[tex]m=196.97 g[/tex]

If 7.36 g of sodium metal react, how many grams of sodium hydroxide can be produced

Answers

You would also need to know the mol of sodium. After knowing the mol, write down the reaction;
Na + H20 -> NaOH + H2
Use the mol ratio, to find the amount of mol of sodium hydroxide. (Remember to balance the equation first)
After you have the necessary variables, use the following formula:
mass of sodium hydroxide = mol of sodium hydroxide x molar mass (relative/formula mass of sodium hydroxide)
That is how you will find the mass of sodium hydroxide.

How many grams of lead (ii) chloride will dissolve in a 0.750 l of 0.650 m pb(no3)2 solution? the ksp of lead (ii) chloride is 1.7 x 10-5 ?

Answers

if you do it is 2130 

A student dissolves 4.5 G of sodium chloride into 75 grams of water which of the following statements is correct regarding the results solution when it is compared to a pure solvent

Answers

"The vapor pressure will decrease and the boiling temperature will increase." When sodium chloride is added to water, the vapor pressure above the resulting salt solution is less than the vapor pressure above the pure water, and the boiling point of the salt solution will be greater than the boiling point of pure water. This results from the introduction of salt molecules to water, in which the salt solution needs a higher temperature for the vapor pressure to be equal to the pressure of the atmosphere.

what is the main result of cellular respiration

Answers

Answer:

Summary. Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.

Explanation:

Which technique is used to compare ink on a suspect document?
A) thin-layer chromatography
B) infrared spectrophotometry
C) blotting with alcohol method
D) ultraviolet spectrophotometry

Answers

Final answer:

The technique of thin-layer chromatography is used to compare ink on a suspect document. This is done by creating a chromatogram through exposing the ink to a solvent and observing the resulting pattern of spots.

Explanation:

The technique used to compare ink on a suspect document is A) thin-layer chromatography. Thin-layer chromatography is a type of chromatography that is widely used to separate mixtures in forensic analysis. In this process, the ink sample from the suspect document is placed on a thin layer of absorbent material.

The sample is then exposed to a solvent, which moves up the stationary phase, carrying different components of the ink at different rates. This results in a series of spots, that form a chromatogram, can then be compared to known samples for identification.

Learn more about Thin-layer Chromatography here:

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