Question 1

Balance the following equation. B₂H₆(g)+ O₂(g)→ B₂O₃(s)+ H₂O(g) What is the stoichiometric coefficient for oxygen?

Accepted Answer

The answer of Balance the following equation. B₂H₆(g)+ O₂(g)→ B₂O₃(s)+...

Question 2

Why are the halogens among the most active nonmetals?

Accepted Answer

Halogens have seven valence electrons and require only one more electron to have a complete octet in their outermost energy level, which is the same electron configuration as the noble gases. This makes them highly reactive as they have a strong tendency to gain an electron and become negatively charged ions. Additionally, their small size allows them to more easily attract and gain electrons, further contributing to their reactivity.

Question 3

What is one of the products of a combustion reaction?

Accepted Answer

One of the main products of a combustion reaction is heat, as it is a form of energy that is released when a fuel reacts with oxygen. Other products may include carbon dioxide, water vapor, and various gases depending on the specific reaction and the type of fuel being burned. None of the other answer choices are products of combustion reactions.

Question 4

How many grams of the excess reagent are left over if 37.8g of Cl₂ react with 39.4 g of NaF? Cl₂(g)+ 2 NaF(aq)→ 2 NaCl(aq)+ F₂(g)

Accepted Answer

The answer of How many grams of the excess reagent...

Question 5

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂→ 16 CO₂ + 18 H₂O

Accepted Answer

To find the percent yield, we need to compare the actual yield (28.16 g) with the theoretical yield (calculated from stoichiometry). From the balanced equation, we see that 2 moles of C₈H₁₈ react with 25 moles of O₂ to form 16 moles of CO₂. Therefore, to calculate the theoretical yield of CO₂, we can use the mole ratio: 4.000 moles O₂ x (16 moles CO₂ / 25 moles O₂) = 2.560 moles CO₂ Then, we can convert moles of CO₂ to grams using its molar mass: 2.560 moles CO₂ x (60.08 g / 1 mole) = 153.89 g CO₂ (theoretical yield) Finally, we can calculate the percent yield: (percent yield) = (actual yield / theoretical yield) x 100% = (28.16 g / 153.89 g) x 100% = 18.3% Rounding to two significant figures, the answer is 25.00% (choice B).

Question 6

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s)+ 2 Al(s)→ Al₂O₃(s)+ 2 Fe(s)

Accepted Answer

The answer of Determine the percent yield of a reaction...

Question 7

How many moles of SnCl₂ will be produced if 85.3 g of FeCl₃ is reacted with an excess of Sn for the following reaction: 2 FeCl₃(s)+ 3 Sn(s)→ 3 SnCl₂(s)+ 2 Fe(s)

Accepted Answer

The molar mass of FeCl3 is approximately 162.2 g/mol. Therefore, 85.3 g of FeCl3 is equivalent to 85.3 g / 162.2 g/mol = 0.526 mol of FeCl3. According to the balanced equation, 2 moles of FeCl3 produce 3 moles of SnCl2. Thus, 0.526 mol of FeCl3 will produce (3/2) * 0.526 mol = 0.789 mol of SnCl2.

Question 8

What is the percent yield of H₂ if 58.94g of methane yields 14.61g of H₂ for the following reaction: CH₄(g)+ 2 H₂O(g)→ 4 H₂(g)+ CO₂(g)

Accepted Answer

The answer of What is the percent yield of H₂...

Question 9

What is the percent yield of C₂H₂ if 62.80g of water yields 15.38g of C₂H₂ using the following equation. CaC₂(s)+ 2 H₂O(l)→ Ca(OH)₂(aq)+ C₂H₂(g)

Accepted Answer

The theoretical yield of C2H2 is calculated based on the stoichiometry of the reaction and the molar mass of water and C2H2. The percent yield is then calculated as (actual yield/theoretical yield) x 100%.

Question 10

Which should give the most vigorous reaction when dropped in water?

Accepted Answer

Choice B, potassium (K), should give the most vigorous reaction when dropped in water. This is because potassium is an alkali metal, which are highly reactive with water. When alkali metals are added to water, they react with the water molecules to produce hydrogen gas and the corresponding metal hydroxide. The reactivity of alkali metals increases down the group, so potassium should react more vigorously than the other choices listed.

Question 11

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C₆H₁₂O₆(aq)→ 2 C₂H₅OH(l)+ 2 CO₂(g)

Accepted Answer

The theoretical yield of ethanol can be calculated using the stoichiometry of the reaction and the molar mass of ethanol. From the balanced equation, we can see that 1 mole of glucose produces 2 moles of ethanol. The molar mass of glucose is 180.16 g/mol, and the molar mass of ethanol is 46.07 g/mol. Therefore, 100.0 g of glucose will produce (100.0 g / 180.16 g/mol) * (2 mol ethanol / 1 mol glucose) * (46.07 g/mol ethanol) = 51.09 g of ethanol.

Question 12

All of the following are examples of chemical properties EXCEPT

Accepted Answer

Chlorophyll being responsible for the green color of leaves is a physical property, not a chemical property. The other options are examples of chemical properties.

Question 13

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 8.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Accepted Answer

The reaction is limited by O2, which is not enough to react with all the C8H18. The theoretical yield of CO2 is calculated based on the limiting reactant, O2. The actual yield is 28.16 g of CO2, and the theoretical yield is higher, leading to a percent yield of 12.50%.

Question 14

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Accepted Answer

The answer of Give the percent yield when 28.16 g...

Question 15

Which should give the least vigorous reaction when dropped in water?

Accepted Answer

Li is the smallest and least reactive alkali metal due to its low nuclear charge and small atomic radius, which makes it less likely to react vigorously with water compared to the other alkali metals. The reactivity of alkali metals with water generally increases as you go down the group, so Cs would be expected to have the most vigorous reaction.

Question 16

Which one of the following halogen reaction contains a product with covalent bonds?

Accepted Answer

Br2(l) + Cl2(g) → 2BrCl(g)The product, BrCl, is a covalent compound because it is formed by the sharing of electrons between the bromine and chlorine atoms.

Question 17

Aluminum metal reacts with aqueous iron( III)oxide to form aqueous aluminum oxide and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

Accepted Answer

The answer of Aluminum metal reacts with aqueous iron( III)oxide...

Question 18

According to the following reaction,what amount of Al₂S₃ remains when 20.00 g of Al₂S₃ and 2.00 g of H₂O are reacted? A few of the molar masses are as follows: Al₂S₃= 150.17 g/mol,H₂O = 18.02 g/mol. Al₂S₃(s)+ 6 H₂O(l)→ 2 Al(OH)₃(s)+ 3 H₂S(g)

Accepted Answer

The answer of According to the following reaction,what amount of...

Question 19

Choose the reaction that represents the combustion of C₆H₁₂O₂.

Accepted Answer

The balanced chemical equation for the combustion of C₆H₁₂O₂ is: C₆H₁₂O₂(l) + 8 O2(g) → 6 CO2(g) + 6 H2O(g) Option A represents the same chemical equation in terms of molecular formulas.

Question 20

How many moles of PCl₅ will be produced if .331 moles of P₄ is reacted with an excess of Cl₂ using the following equation. P₄(s)+ 10 Cl₂(g)→ 4 PCl₅(g)

Accepted Answer

According to the balanced equation, 1 mole of P4 produces 4 moles of PCl5. Therefore, 0.331 moles of P4 will produce 0.331 * 4 = 1.324 moles of PCl5.

Quiz 8: Chemical Reactions and Chemical Quantities

Balance the following equation. B₂H₆(g) + O₂(g) → B₂O₃(s) + H₂O(g) What is the stoichiometric coefficient for oxygen?

Why are the halogens among the most active nonmetals?

What is one of the products of a combustion reaction?

How many grams of the excess reagent are left over if 37.8g of Cl₂ react with 39.4 g of NaF? Cl₂(g) + 2 NaF(aq) → 2 NaCl(aq) + F₂(g)

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂→ 16 CO₂ + 18 H₂O

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Fe(s)

How many moles of SnCl₂ will be produced if 85.3 g of FeCl₃ is reacted with an excess of Sn for the following reaction: 2 FeCl₃(s) + 3 Sn(s) → 3 SnCl₂(s) + 2 Fe(s)

What is the percent yield of H₂ if 58.94g of methane yields 14.61g of H₂ for the following reaction: CH₄(g) + 2 H₂O(g) → 4 H₂(g) + CO₂(g)

What is the percent yield of C₂H₂ if 62.80g of water yields 15.38g of C₂H₂ using the following equation. CaC₂(s) + 2 H₂O(l) → Ca(OH) ₂(aq) + C₂H₂(g)

Which should give the most vigorous reaction when dropped in water?

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C₆H₁₂O₆(aq) → 2 C₂H₅OH(l) + 2 CO₂(g)

All of the following are examples of chemical properties EXCEPT

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 8.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Which should give the least vigorous reaction when dropped in water?

Which one of the following halogen reaction contains a product with covalent bonds?

Aluminum metal reacts with aqueous iron( III) oxide to form aqueous aluminum oxide and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

According to the following reaction,what amount of Al₂S₃ remains when 20.00 g of Al₂S₃ and 2.00 g of H₂O are reacted? A few of the molar masses are as follows: Al₂S₃= 150.17 g/mol,H₂O = 18.02 g/mol. Al₂S₃(s) + 6 H₂O(l) → 2 Al(OH) ₃(s) + 3 H₂S(g)

Choose the reaction that represents the combustion of C₆H₁₂O₂.

How many moles of PCl₅ will be produced if .331 moles of P₄ is reacted with an excess of Cl₂ using the following equation. P₄(s) + 10 Cl₂(g) → 4 PCl₅(g)

Quiz 8: Chemical Reactions and Chemical Quantities

Balance the following equation. B2H6(g) + O2(g) → B2O3(s) + H2O(g) What is the stoichiometric coefficient for oxygen?

Why are the halogens among the most active nonmetals?

What is one of the products of a combustion reaction?

How many grams of the excess reagent are left over if 37.8g of Cl2 react with 39.4 g of NaF? Cl2(g) + 2 NaF(aq) → 2 NaCl(aq) + F2(g)

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction. Fe2O3(s) + 2 Al(s) → Al2O3(s) + 2 Fe(s)

How many moles of SnCl2 will be produced if 85.3 g of FeCl3 is reacted with an excess of Sn for the following reaction: 2 FeCl3(s) + 3 Sn(s) → 3 SnCl2(s) + 2 Fe(s)

What is the percent yield of H2 if 58.94g of methane yields 14.61g of H2 for the following reaction: CH4(g) + 2 H2O(g) → 4 H2(g) + CO2(g)

What is the percent yield of C2H2 if 62.80g of water yields 15.38g of C2H2 using the following equation. CaC2(s) + 2 H2O(l) → Ca(OH) 2(aq) + C2H2(g)

Which should give the most vigorous reaction when dropped in water?

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C6H12O6(aq) → 2 C2H5OH(l) + 2 CO2(g)

All of the following are examples of chemical properties EXCEPT

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 8.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 4.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Which should give the least vigorous reaction when dropped in water?

Which one of the following halogen reaction contains a product with covalent bonds?

Aluminum metal reacts with aqueous iron( III) oxide to form aqueous aluminum oxide and iron metal.What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest,whole-number stoichiometric coefficients?

According to the following reaction,what amount of Al2S3 remains when 20.00 g of Al2S3 and 2.00 g of H2O are reacted? A few of the molar masses are as follows: Al2S3 = 150.17 g/mol,H2O = 18.02 g/mol. Al2S3(s) + 6 H2O(l) → 2 Al(OH) 3(s) + 3 H2S(g)

Choose the reaction that represents the combustion of C6H12O2.

How many moles of PCl5 will be produced if .331 moles of P4 is reacted with an excess of Cl2 using the following equation. P4(s) + 10 Cl2(g) → 4 PCl5(g)

Balance the following equation. B₂H₆(g) + O₂(g) → B₂O₃(s) + H₂O(g) What is the stoichiometric coefficient for oxygen?

How many grams of the excess reagent are left over if 37.8g of Cl₂ react with 39.4 g of NaF? Cl₂(g) + 2 NaF(aq) → 2 NaCl(aq) + F₂(g)

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂→ 16 CO₂ + 18 H₂O

Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe₂O₃ react with excess Al according to the following reaction. Fe₂O₃(s) + 2 Al(s) → Al₂O₃(s) + 2 Fe(s)

How many moles of SnCl₂ will be produced if 85.3 g of FeCl₃ is reacted with an excess of Sn for the following reaction: 2 FeCl₃(s) + 3 Sn(s) → 3 SnCl₂(s) + 2 Fe(s)

What is the percent yield of H₂ if 58.94g of methane yields 14.61g of H₂ for the following reaction: CH₄(g) + 2 H₂O(g) → 4 H₂(g) + CO₂(g)

What is the percent yield of C₂H₂ if 62.80g of water yields 15.38g of C₂H₂ using the following equation. CaC₂(s) + 2 H₂O(l) → Ca(OH) ₂(aq) + C₂H₂(g)

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C₆H₁₂O₆(aq) → 2 C₂H₅OH(l) + 2 CO₂(g)

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 8.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 4.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

According to the following reaction,what amount of Al₂S₃ remains when 20.00 g of Al₂S₃ and 2.00 g of H₂O are reacted? A few of the molar masses are as follows: Al₂S₃= 150.17 g/mol,H₂O = 18.02 g/mol. Al₂S₃(s) + 6 H₂O(l) → 2 Al(OH) ₃(s) + 3 H₂S(g)

Choose the reaction that represents the combustion of C₆H₁₂O₂.

How many moles of PCl₅ will be produced if .331 moles of P₄ is reacted with an excess of Cl₂ using the following equation. P₄(s) + 10 Cl₂(g) → 4 PCl₅(g)