Question 1

Which of the following best explains why sodium (Na) and chlorine (Cl) readily form an ionic bond?

Accepted Answer

Because sodium has a low ionization energy and chlorine has a high electron affinity, resulting in electron transfer.

Question 2

A student is asked to balance the following chemical equation for the combustion of propane: $$\mathrm{C_3H_8 + O_2$ \rightarrow CO_2$ + H_2O}. $$What are the correct coefficients for each compound in the balanced equation?

Accepted Answer

$$1, 5, 3, 4$$

Question 3

Which of the following statements about the periodic trends in atomic radius is correct?

Accepted Answer

Atomic radius decreases across a period from left to right due to increasing nuclear charge.

Question 4

A chemist needs to prepare $$250\ \mathrm{mL} of a$$ $$0.50\ \mathrm{mol/L}$$ NaCl solution. What mass of NaCl (molar mass $$= 58.44\ \mathrm{g/mol}) is $$required?

Accepted Answer

$$2.92\ \mathrm{g}$$

Question 5

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

A physical property can be observed without changing the substance's identity, while a chemical property describes its reactivity.

Question 6

Which of the following is the correct empirical formula for a compound containing $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 7

A reaction has a theoretical yield of $$10.0\ \mathrm{g}$$ but only $$7.5\ \mathrm{g} of $$product is obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 8

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules are polar and can surround and separate ions due to their partial charges.

Question 9

Which gas law explains why a balloon shrinks when placed in a freezer?

Accepted Answer

Charles's Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$}$$

Question 10

Which of the following is a real-world example of a double displacement reaction?

Accepted Answer

The reaction of hydrochloric acid with sodium hydroxide to form water and sodium chloride.

Question 11

A $$2.00\ \mathrm{L}$$ container holds $$0.50\ \mathrm{mol} of an $$ideal gas at $$300\ \mathrm{K}. $$What is the pressure in the container? $$(R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$6.15\ \mathrm{atm}$$

Question 12

Which of the following best describes the environmental impact of incomplete combustion of hydrocarbons in car engines?

Accepted Answer

It produces carbon monoxide, which is toxic and contributes to air pollution.

Question 13

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of silver nitrate and sodium chloride?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 14

A sample of gas occupies $$4.00\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will be its volume at $$2.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}$$?

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 15

Which of the following best describes the Arrhenius theory of acids and bases?

Accepted Answer

Acids produce $$\mathrm{H^+}$$ ions and bases produce $$\mathrm{OH^-}$$ ions in aqueous solution.

Question 16

Which of the following is a significant reason for the importance of quantitative accuracy in industrial chemical processes?

Accepted Answer

To ensure that products are produced in the correct amounts, minimizing waste and cost.

Question 17

Which of the following is a Canadian initiative aimed at reducing air pollution?

Accepted Answer

The Clean Air Regulatory Agenda, which sets emission standards for industries.

Question 18

Which of the following best explains why isotopic abundance is important in calculating the relative atomic mass of an element?

Accepted Answer

Because the relative atomic mass is the average of the masses of all isotopes, weighted by their natural abundance.

Question 19

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$KNO$$_3 ($$molar mass $$= 101.1\ \mathrm{g/mol}) in $$enough water to make $$250\ \mathrm{mL} of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.198\ \mathrm{mol/L}$$

General Chemistry Course Outline and Key Topics (Grade 11, SCH 3U)

Study Guide - Practice Questions

Study Guide - Flashcards