A candle is placed on one pan of a balance, and an equal weight is placed on the other
pan. What would happen if you lit up the candle and waited for a while?

Answer:

30284.88J

Explanation:

Given parameters:

Mass of ethanol  = 257g

Specific heat capacity of ethanol  = 2.4J/g°C

Temperature change  = 49.1°C

Unknown:

Amount of heat  = ?

Solution:

The quantity of heat need to cause a temperature change on a body is given as;

               H  =  m c Δt

where  m is the mass

             c is the specific heat capacity

            Δt  is the change in temperature

All units in proper dimensions. Input the parameters and solve for H;

       H  = 257 x 2.4 x 49.1

        H  = 30284.88J

Answer:

An Ionic Bond

Explanation:

Salt compounds are formed by the "donating" of electrons.

Answer:

NaCl, or Salt, is an ionic bond.

Explanation:

Ionic bonds are formed from one metal and one nonmetal, Sodium being the metal and Chlorine being the nonmetal.

To determine the mass of silver produced in the reaction, we need to calculate the moles of magnesium that react and use the mole ratio from the balanced equation. Given that 6.50x10^23 atoms of Mg react, the mass of silver produced is 232.87 grams.

To determine the mass of silver (Ag) produced, we need to calculate the number of moles of magnesium (Mg) that react and use the mole ratio from the balanced equation. First, convert the given number of atoms of Mg to moles by dividing by Avogadro's number. Then, use the balanced equation to relate the moles of Mg to the moles of Ag. Finally, convert the moles of Ag to grams by multiplying by the molar mass of Ag.

In this case, the mole ratio between Mg and Ag is 1:2. So, for every mole of Mg that reacts, 2 moles of Ag are produced. Given that 6.50x10^23 atoms of Mg react, we can calculate:

Moles of Mg = (6.50x1023 atoms / 6.022x10^23 atoms/mol) = 1.08 moles of Mg

Moles of Ag = 2 moles of Ag / 1 mole of Mg * 1.08 moles of Mg = 2.16 moles of Ag

Grams of Ag = Moles of Ag * Molar mass of Ag = (2.16 moles) * (107.87 g/mol) = 232.87 grams of Ag

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Answer:

percentage of water = 18.76%

Explanation:

A chemist has a sample of hydrated Li2SiF6  and it weighs 0.4813 grams.

The overall weight of the compound is 0.4813 grams.

weight of hydrated sample = 0.4813 grams.

weight of anhydrous compound = 0.391 grams

percentage weight of water = mass of water/mass of the hydrated compound × 100

mass of water = mass of hydrated compound - mass of anhydrous compound

mass of water = 0.4813 - 0.391  = 0.0903 grams.

percentage of water = 0.0903/0.4813 × 100

percentage of water = 9.03/0.4813

percentage of water = 18.761687097

percentage of water = 18.76%

Answer:

18.8%

Explanation:

Step 1:

The following data were obtained from the question.

Mass of hydrated Li2SiF6 = 0.4813 g

Mass of anhydrous Li2SiF6 = 0.391 g

Step 2:

Determination of the mass of the water in the hydrate.

Mass of water = (Mass of hydrated Li2SiF6) - (Mass of anhydrous Li2SiF6)

Mass of water = 0.4813 - 0.391

Mass of water = 0.0903 g

Step 3:

Determination of the percentage of water in the hydrate.

The percentage of water = Mass of water/ mass of hydrate x 100

The percentage of water = 0.0903/0.4813 x 100

The percentage of water = 18.8%

Explanation:

Because molarity is classified as moles of solute per liter of water, dilution of the water may result in a reduction of its concentration.

Therefore, because the amount of moles of solute has to be constant for dilution, you will use the molarity and volume of that same target solution to calculate how many moles of solute will be present in the sample of the stock solution that you dilute.

c  =   [tex]\frac{n}{v}[/tex]

⇒  n = c ⋅  V

[tex]n_{HCL}[/tex] =  0.250 M  ⋅  6.00 L  = 1.5 moles HCl

Now all you have to do is figure out what volume of   6.0 M  stock solution will contain  1.5  moles of hydrochloric acid

c = [tex]\frac{n}{v}[/tex]

V = [tex]\frac{n}{c}[/tex]

[tex]V_{Stock}[/tex] = [tex]\frac{1.5 moles}{6.0 \frac{moles}{L} }[/tex]   = 0.25 L

Expressed in milliliters, the answer will be

[tex]V_{Stock} = 250ML[/tex] →  rounded to two sig figs

Answer:

Explanation:

Fossil fuel is nonrenewable, whereas hydro, wind, solar, and wave power are generally ... depletes its fuel stock but at a relatively slow rate, and geothermal energy (Williamson, ... Future primary energy sources (e.g. nuclear, coal and solar) are primarily ... b. Distributed peak electrical generation, •. c. Distributed electricity ...

Answer: is C fossil fuel

The initial volume of the gas can be determined using the ideal gas law. The simplified formula was rearranged to solve for the initial volume. The calculation showed that the initial volume was 18.19 liters.

The subject of the question can be tackled with the application of the ideal gas law represented by the equation PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature. However, since the number of moles doesn't change in the problem, we can omit n and R from it and use the simplified version of it, that is P1V1/T1=P2V2/T2. Here P1, V1 and T1 refer to the initial pressure, volume and temperature and P2, V2 and T2 refer to the final pressure, volume and temperature respectively.

To get the initial volume of the gas V1, we rearrange the simplified ideal gas law to V1 = (P2V2T1)/(P1T2). Plugging the given values in the formula we get V1 = (30 atm * 29 L * 115 K) / (60 atm * 225 K) = 18.19 liters.

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The correct answer is that the initial volume of the gas was [tex]14.5 \ liters[/tex].

To solve this problem, we can use the combined gas law, which states that for a given amount of gas, the product of pressure and volume divided by the temperature is constant:

[tex]\[\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\][/tex]

where [tex]\(P_1\), \(V_1\)[/tex], and [tex]\(T_1\)[/tex] are the initial pressure, volume, and temperature, respectively, and [tex]\(P_2\), \(V_2\)[/tex], and [tex]\(T_2\)[/tex] are the final pressure, volume, and temperature, respectively.

Given:

[tex]\(P_1 = 60\) atm[/tex] (initial pressure)

[tex]\(P_2 = 30\)[/tex] [tex]\(T_1 = 115\) K[/tex] (initial temperature)

[tex]\(P_2 = 30\)[/tex] atm (final pressure)

[tex]\(V_2 = 29\) liters[/tex] (final temperature)

[tex]\(V_2 = 29\) liters[/tex] (final volume)

We want to find [tex]\(V_1\)[/tex] (initial volume). Rearranging the combined gas law to solve for [tex]\(V_1\)[/tex], we get:

[tex]\[V_1 = \frac{P_2V_2T_1}{P_1T_2}\][/tex]

Plugging in the given values:

[tex]\[V_1 = \frac{(30\text{ atm})(29\text{ liters})(115\text{ K})}{(60\text{ atm})(225\text{ K})}\][/tex]

[tex]\[V_1 = \frac{30 \times 29 \times 115}{60 \times 225}\][/tex]

[tex]\[V_1 = \frac{99350}{13500}\][/tex]

[tex]\[V_1 = 14.5\text{ liters}\][/tex]

Answer:

Parallel Circuit

Explanation:

In a parallel circuit, there are multiple paths through which the current can flow, so the resistance of the overall circuit is lower than it would be if only one path was available.

Answer:

4362.4 mmHg

Explanation:

Step 1:

Determination of the number of mole of H2 and the number of mole of Ar.

Molar Mass of H2 = 2x1 = 2g/mol

Mass of H2 = 1g

Number of mole of H2 =?

Number of mole = Mass/Molar Mass

Number of mole of H2 = 1/2 = 0.5 mole

Molar Mass of Ar = 40g/mol

Mass of Ar = 8g

Number of mole of Ar =?

Number of mole = Mass/Molar Mass

Number of mole of Ar = 8/40 = 0.2 mole

Step 2:

Data obtained from the question.

Volume (V) of the mixture = 3L

Temperature (T) = 27°C = 27°C + 273 = 300K

Number of mole (n) of the mixture = 0.5 + 0.2 = 0.7 mole

Gas constant (R) = 0.082atm.L/Kmol

Pressure (P) of the mixture =?

Step 3:

Determination of the pressure of the mixture.

The pressure of the mixture can be obtained as follow:

PV = nRT

P x 3 = 0.7 x 0.082 x 300

Divide both side by 3

P = (0.7 x 0.082 x 300) /3

P = 5.74 atm

Step 4:

Conversion of the pressure obtained from atm to mmHg.

1 atm = 760mmHg

Therefore, 5.74 atm = 5.74 x 760 = 4362.4 mmHg

There are approximately [tex]\(1.045 \times 10^{25}\)[/tex] hydrogen atoms in 35.0 g of hydrogen gas, calculated using its molar mass and Avogadro's number.

To find the number of hydrogen atoms in 35.0 g of hydrogen gas, we need to use the concept of molar mass and Avogadro's number.

1. Calculate the molar mass of hydrogen gas (H2):

  The molar mass of one mole of hydrogen gas (H2) is approximately 2.016 g/mol. This value is obtained by adding the atomic masses of two hydrogen atoms (each hydrogen atom has an atomic mass of approximately 1.008 g/mol).

2. Determine the number of moles of hydrogen gas in 35.0 g:

 [tex]\[ \text{Number of moles} = \frac{\text{Mass}}{\text{Molar mass}} = \frac{35.0 \, \text{g}}{2.016 \, \text{g/mol}} \][/tex]

3. Calculate the number of hydrogen atoms using Avogadro's number:

[tex]\[ \text{Number of atoms} = \text{Number of moles} \times \text{Avogadro's number} \][/tex]

Now, let's perform the calculations:

[tex]\[ \text{Number of moles} = \frac{35.0 \, \text{g}}{2.016 \, \text{g/mol}} \approx 17.36 \, \text{mol} \][/tex]

Using Avogadro's number [tex](\(6.022 \times 10^{23} \, \text{atoms/mol}\))[/tex], we have:

[tex]\[ \text{Number of atoms} = 17.36 \, \text{mol} \times (6.022 \times 10^{23} \, \text{atoms/mol}) \][/tex]

[tex]\[ \text{Number of atoms} \approx 1.045 \times 10^{25} \, \text{atoms} \][/tex]

Therefore, there are approximately [tex]\(1.045 \times 10^{25}\)[/tex] hydrogen atoms in 35.0 g of hydrogen gas.

Answer:

could be species I think

Within the taxonomy, organisms are organized hierarchically, the biological species is the set or natural population of organisms that are recognized because they are similar in form and function.

It is a set of organisms capable of reproducing and obtaining fertile (non-hybrid) offspring, and that share their basic defining evolutionary traits.

The organisms of the same species share generic characters and other factors that allow them to resemble each other and distinguish themselves from the rest of the species.

Therefore, we can conclude that many species share evolutionary origins or are evolutionarily related from some common ancestor.

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The statement which is correct about acids or base is if blue litmus paper turns red, the substance has a pH below 7 and is an acid.

Acids are those substances which has a pH value below 7 and bases are those substances which has a pH value greater than 7.

Acids turn blue litmus paper to red color and Bases turn red litmus paper to blue color.

So correct statement is if blue litmus paper turns red, the substance has a pH below 7 and is an acid.

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The products of the unbalanced reaction is Mg(s) + H₂O → Mg(OH)₂(aq) + H₂(g)

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.

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Answer:

atoms bond mixes with oxygen

Explanation:

Just search it up on google dum dum

Reaction of

Ca + HCl => CaCl + H2

Is a single displacement reaction.

The reaction between calcium (Ca) and hydrochloric acid (HCl) to form calcium chloride (CaCl2) and hydrogen gas (H2) is a single displacement reaction. It exemplifies a metal element reacting with an acidic compound to displace hydrogen and form a salt and hydrogen gas.

When calcium (Ca) reacts with hydrochloric acid (HCl), a single displacement reaction occurs where calcium replaces hydrogen in hydrochloric acid to form calcium chloride (CaCl2) and hydrogen gas (H2). This type of chemical reaction where an element reacts with a compound and displaces another element from it is known as a single displacement reaction or substitution reaction. In this case, the balanced reaction would be Ca + 2HCl → CaCl2 + H2.

Related Information:

The reaction of calcium carbonate (CaCO3) with hydrochloric acid to produce calcium chloride, carbon dioxide (CO2), and water (H2O) is an example of a double displacement reaction, also known as a metathesis reaction. Here, two compounds exchange ions to form two new compounds. This reaction is represented by 2 HCl(aq) + CaCO3(aq) → CaCl2(aq) + CO2(g) + H2O(l).

Answer: 310K

Explanation:

Since,

Pressure P = 1.83 atmospheres

Volume of chlorine gas V = 10.2L

Molar gas constant R = 0.0821 L.atm/mol.k)

Number of moles = 0.734 moles

Temperature T(in Kelvin) = ?

Apply ideal gas equation (pV = nRT)

1.83atm x 10.2L= 0.734 moles x 0.0821 L.atm/mol.k x T

18.67 = (0.06026 x T)

T = (18.67 / 0.06026)

T = 310K

Therefore, the new temperature of the chlorine gas is 310K

Answer:

Gas

Explanation:

0.11 moles of the gas are present in the sample of dry gas.

Explanation:

Data given:

mass of the gas  = 2.1025 grams

volume of the gas = 2.850 litres

temperature =  22 degrees (273.15+22) = 295.15 K

Pressure = 740 mm Hg or 0.973 atm

moles of the gas =?

R = 0.08206 atmL/Mole K

From the ideal gas law the number of moles can be calculated in the sample of dry gas. Number of moles will be determined by the pressure exerted, volume and temperature of the gas.

The formula:

PV = nRT

n = [tex]\frac{PV}{RT}[/tex]

putting the values in the above equation:

n = [tex]\frac{2.850 x 0.973}{0.08206 X 295.15}[/tex]

  = 0.11 moles

0.11 moles of the dry gas is present in the sample given.

When, a sample of dry gas weighing 2.1025 g is found to occupy 2.850 L at 22.0oC and 740.0 mm Hg. Then, total 0.0994 moles of gas are present.

First, we convert the temperature to Kelvin (T(K) = T(C) + 273.15) which is 22.0 + 273.15 = 295.15 K. Next, we convert pressure from mm Hg to atm by dividing by 760, as 1 atm = 760 mm Hg:

Pressure in atm = 740.0 mm Hg / 760 mm Hg/atm = 0.9737 atm.

Now we must solve for n, the number of moles of gas:

The number of moles of gas present is therefore 0.0994 moles.

Answer: You're right, it's 8 M

Explanation: The higher the number, the sweater it is.

As the concentration of sugar solute molecules increases, the more sweeter the solution will be. Here, 8 M sugar solution is the sweetest one.

Molarity of a solution is a term use to represent its concentration. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity is a temperature dependant property.

Higher the number of moles of the solute higher is the molarity. When it made more diluted by adding more volume its concentration decreases thereby molarity.

8 M sugar solution contains 8 moles of sugar molecules per one liter of water. Which is higher in concentration than the other given concentrations and thus having more sweet.

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Answer:

A chemical change

Explanation:

The lens below is an example of a convex lens. Once light enters the lens, the light converges or comes together.

Convex Lens: A convex lens is thicker in the middle and thinner at the edges. It bulges outward. When light passes through a convex lens, it refracts (bends) inward toward the center of the lens.

Converges: When light converges, it means that the rays of light come together at a single point after passing through the lens. This point is called the focal point.

So, when light enters a convex lens, it bends inward and focuses at a point, which is known as convergence. This convergence is a characteristic feature of convex lenses and is utilized in various optical instruments like cameras, microscopes, and telescopes to form clear and magnified images.

Answer:

6M

Explanation:

(Molarity x Volume)concentrated soln = (Molarity x Volume)diluted doln

Molarity dilute soln = [(M x V)conc/V (dilute)] = 1.5L x 12M / 3.0L = 6M final dilute soln

Answer:

0.144 nm

Explanation:

Silver's electronic configuration is (Kr)(4d)10(5s)1, and it has an atomic radius of 0.144 nm.

Answer:

135g

Explanation:

The equation for the reaction is given below:

2H2 + O2 —> 2H2O

Next, let us calculate the mass of H2 that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:

Molar Mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2 = 4g

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

From the balanced equation,

4g of H2 produced 36g of H2O.

Therefore, 15g of H2 will produce = (15x36)/4 = 135g of H2O

From the calculations made above, 15g of H2 produced 135g of water (H2O)

Final answer:

15 grams of hydrogen can produce 133.80 grams of water when reacted with sufficient oxygen, following the stoichiometry of the balanced chemical equation 2H₂ + O₂ → 2H₂O.

Explanation:

The question asks how many grams of water can be produced from 15 grams of hydrogen according to the balanced chemical reaction: 2H₂(g) + O₂(g) → 2H₂O(l).

Using stoichiometry, we first determine the molar mass of hydrogen (H₂). Since there are 2 moles of hydrogen in the reaction and the molar mass of hydrogen (H) is approximately 1.01 g/mol, the molar mass of H₂ is 2.02 g/mol. This means 2 moles of H₂ weigh 4.04 g.

Therefore, 15 grams of hydrogen is equivalent to 15 g H₂ × (1 mol H₂ / 2.02 g H₂) = 7.426 moles of H₂.

According to the balanced equation, 2 moles of H₂ produce 2 moles of H₂O. So, 7.426 moles of H₂ would produce 7.426 moles of H₂O.

As the molar mass of H₂O is 18.02 g/mol, 7.426 moles of H₂O would weigh:

7.426 moles × 18.02 g/mol = 133.80 g of H₂O.

Thus, 15 grams of hydrogen can produce 133.80 grams of water, assuming there's sufficient oxygen available to react completely with the hydrogen.

(c) Temperature 

Temperature is measured directly in a coffee-cup calorimeter.

See Attached Image. Figure shows Coffee-cup calorimeter. This simple apparatus is used to measure temperature changes of reactions at constant pressure.

(c) Temperature is measured directly in a coffee-cup calorimeter.

It is  essentially a polystyrene (Styrofoam) cup with a lid. The cup is partially filled with a known volume of water and a thermometer is inserted through the lid of the cup so that its bulb is below the water surface.

Out of the given options,

Temperature is measured directly in a coffee-cup calorimeter.

Thus, option C is correct.

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Answer:

When a rock gets hot it expands a little, and when it gets cold the rock contracts a little. If a rock is heated and cooled many times, cracks form and pieces of rock fall away. This type of physical weathering happens a lot in deserts, because it is very hot during the day but very cold at night.

Explanation:

Answer:

The particles of rock are rearranged.

The sizes and shapes of the rocks are changed.

The identities and total mass of the rocks remain the same.

A physical change is a change in some of the physical properties of matter, but not its identity.

Explanation:2020

WFH 8th Gr PhySci_20-21

The number of total molecules on both sides of a balanced equation may differ. It is the number of each type of atom that must be equal, not the molecule count, to comply with the law of conservation of matter.

The number of total molecules on the left side of a balanced equation does not necessarily have to equal the number of total molecules on the right side. What must be equal are the numbers of each type of atom because chemical reactions follow the law of conservation of matter, meaning that matter is not created or destroyed in a chemical reaction. The balancing of equations ensures that there is the same number of each kind of atom on both sides of the equation, thereby obeying this fundamental law.

However, the actual molecule numbers can vary, as it's the ratio of molecules that must reflect the coefficients in the balanced equation. For instance, if we have 2 H2O (2 molecules of water) as reactants, this could lead to 2 H2 and 1 O2 (3 molecules in total) as products, with 4 hydrogen atoms and 2 oxygen atoms balanced on both sides.