Q: Which of the following is the correct net ionic equation for the reaction between aqueous solutions of $$\\ce{AgNO3}$$ and $$\\ce{NaCl}$$?

$$\\ce{Ag^+ (aq) + Cl^- (aq) -\u003e AgCl (s)}$$

Q: Which of the following is a balanced equation for the combustion of propane ($$\\ce{C3H8}) in $$oxygen?

$$\\ce{C3H8 + 5 O2 -\u003e 3 CO2 + 4 H2O}$$

Q: Which of the following acids is considered a strong acid?

Hydrochloric acid ($$\\ce{HCl})$$

Q: Which of the following is the correct sequence for converting grams of a compound to number of molecules?

Grams $$\\to$$ Moles $$\\to$$ Number of molecules

Q: Which of the following is a decomposition reaction?

$$\\ce{2 KClO3 -\u003e 2 KCl + 3 O2}$$

Question 1

Which of the following statements best describes the limiting reactant in a chemical reaction?

Accepted Answer

It is the reactant that determines the amount of product formed because it is completely consumed first.

Question 2

A student mixes 0.50 mol of $$\ce{Na2SO4}$$ with 0.30 mol of $$\ce{BaCl2} in $$water. The reaction is:

$$\ce{Na2SO4 (aq) + BaCl2 (aq) -\u003e 2 NaCl (aq) + BaSO4 (s)}$$

Which compound is the limiting reactant?

Accepted Answer

$$\ce{BaCl2}$$

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of $$\ce{AgNO3}$$ and $$\ce{NaCl}$$?

Accepted Answer

$$\ce{Ag^+ (aq) + Cl^- (aq) -\u003e AgCl (s)}$$

Question 4

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound?

Accepted Answer

$$\ce{CH2O}$$

Question 5

Which of the following best describes an electrolyte?

Accepted Answer

A substance that produces ions when dissolved in water, allowing the solution to conduct electricity.

Question 6

What is the molarity of a solution prepared by dissolving 10.0 g of $$\ce{NaOH} ($$molar mass = 40.0 g/mol) in enough water to make 500.0 mL of solution?

Accepted Answer

$$0.50 M$$

Question 7

Which of the following is a balanced equation for the combustion of propane ($$\ce{C3H8}) in $$oxygen?

Accepted Answer

$$\ce{C3H8 + 5 O2 -\u003e 3 CO2 + 4 H2O}$$

Question 8

A solution is prepared by diluting 25.0 mL of 6.00 M $$\ce{HCl} to a $$final volume of 100.0 mL. What is the final concentration?

Accepted Answer

$$1.50 M$$

Question 9

Which of the following acids is considered a strong acid?

Accepted Answer

Hydrochloric acid ($$\ce{HCl})$$

Question 10

A sample contains $$3.01 \times 10$$^{23}$$ molecules of $$\ce{CO2}$$. How many moles of $$\ce{CO2}$$ are present?

Accepted Answer

$$0.50$$ mol

Question 11

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

$$\ce{AgCl}$$

Question 12

What is the percent by mass of oxygen in $$\ce{H2O}$$? (Molar mass of $$\ce{H2O} = 18.0 g/$$mol)

Accepted Answer

$$88.9\%$$

Question 13

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 14

Which of the following is the correct molecular formula for a compound with an empirical formula of $$\ce{CH2}$$ and a molar mass of 56 g/mol?

Accepted Answer

$$\ce{C4H8}$$

Question 15

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid and a base react to form water and a salt.

Question 16

How many grams of $$\ce{CaCl2} ($$molar mass = 111 g/mol) are needed to prepare 0.250 L of a 2.00 M solution?

Accepted Answer

$$27.8 g$$

Question 17

Which of the following is the correct sequence for converting grams of a compound to number of molecules?

Accepted Answer

Grams $$\to$$ Moles $$\to$$ Number of molecules

Question 18

A student performs a combustion analysis and finds that burning 1.00 g of a hydrocarbon produces 3.14 g of $$\ce{CO2}$$ and 1.29 g of $$\ce{H2O}. $$What is the empirical formula of the hydrocarbon?

Accepted Answer

$$\ce{CH4}$$

Question 19

Which of the following is a decomposition reaction?

Accepted Answer

$$\ce{2 KClO3 -\u003e 2 KCl + 3 O2}$$

Question 20

Which of the following statements about strong and weak acids is correct?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

Chemistry 2045 Exam 2 Study Guide: Chemical Reactions, Stoichiometry, and Solutions

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드