Checkpoint 5 Test

Which of the following equations represents a single-replacement reaction?

• NaOH(aq) + HCl(aq) ↔ NaCl(aq) + H₂O(l)

• Mg(s) + ZnCl₂(aq) ↔ Zn(s) + MgCl₂(aq)

• 2HCl(aq) + Ba(OH)₂(aq) ↔ BaCl₂(aq) + 2H₂O(l)

• 2AgNO_³(aq) + Na₂CrO4(aq) ↔ Ag₂CrO₄(s) + 2NaNO₃(aq)

When the equation

Al(s) + O₂(g) → Al₂O₃(s)

is correctly balanced using the smallest whole numbers, what will be the

coefficient of Al(s)?

• 1

• 2

• 3

• 4

Which reaction represents the process of neutralization?

• HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

• 2 KClO₃(s) → KCl(s) + 3 O₂(g)

• Pb(NO₃)₂(aq) + CaCl(aq) → Ca(NO₃)₂(aq) + PbCl₂(s)

• Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

The unbalanced chemical equation below represents the formation of ammonia.

N₂(g) + H₂(g) → NH₃(g)

When the equation is balanced using the smallest whole-number coefficients, what

is the ratio of moles of hydrogen consumed to moles of ammonia produced?

• 1:3

• 3:2

• 3:1

• 2:3

What always happens when a chemical reaction occurs?

• New substances are formed.

• Gases and light are given off.

• Substances change size and shape.

• The mass of the reactants is converted into energy.

Complete the statement about reaction types. Move the answers to the correct boxes.

The general formula A + B → AB is for ​ (a)   reactions, while the

general formula AB → A + B is for ​ (b)   reactions.

​

• Synthesis
• Decomposition
• combustion
• single replacemenr

A student combines solutions of silver nitrate, AgNO₃, and sodium chromate, Na₂CrO₄, and observes that a reddish-brown solid forms. The reaction is below.

AgNO₃ (aq) + Na₂CrO₄ (aq) → Ag₂CrO₄ (s) + NaNO₃ (aq)

Based on this observation, which type of a reaction can the student infer has

occurred?

• acid-base reaction

• decomposition reaction

• combustion reaction

• precipitation reaction

When the human stomach produces too much hydrochloric acid (HCl), a condition called indigestion creates a burning sensation in the stomach. One common product used to offset indigestion is Milk of Magnesia with the active ingredient magnesium hydroxide (Mg(OH)₂).

The resulting reaction is predicted below:

2HCl (aq) + Mg(OH)₂ (aq) → MgCl₂ (aq) + 2H₂O (l)

What kind of reaction occurs when hydrochloric acid is neutralized with magnesium hydroxide?

• Synthesis

• Combustion

• Single replacement

• Double replacement

Which statements of the following are true regarding the equation listed below?

Fe + CuCl₂ → FeCl₂ + Cu

Select TWO correct answers.

• The equation is balanced.

• The equation is not balanced.

• This is a synthesis reaction.

• This is a single-replacement reaction.

• This is a decomposition reaction.

Match up the chemical reactions.

• decomposition

• Occurs when a pure element switches places with and element in a compound

• single replacement

• occurs when simple compounds combine to create a complex compound

• combustion

• Occurs when a compound containing carbon and hydrogen reacts with oxygen to create water and carbon dioxide

• neutralization

• occurs when an acid and a base are added to each other in equal amounts and a salt and water are formed

• synthesis

• Occurs when a compound is broken down into simpler ones