Pre-Lab Experiment 3 Quiz

Chapter 1. Pre-lab Experiment 3: Chemical Equation

Introduction

Pre-Lab Experiment 3 Quiz

true

false

Welctome to PreLab Experiment 3 Quiz

To Begin your quiz, click the Next button.

1.1 Question 1

Which of the following must be the same before and after a chemical reaction?

The sum of the masses of all substances involved.

The number of molecules of all substances involved.

The number of atoms of each type involved.

Both (a) and (c) must be the same.

Each of the answers (a), (b), and (c) must be the same.

Correct.

Incorrect.

Question 2

Identify the reaction type for the following:
2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

Combination reaction.

Decomposition reaction.

Combustion reaction.

Exchange reaction.

Identify the reaction type for the following:
MgO(s) + CO₂(g) → MgCO₃ (s)

Combination reaction.

Decomposition reaction.

Combustion reaction.

Exchange reaction.

Identify the reaction type for the following:
NaCl (aq) + AgNO₃ (aq) → NaNO₃ (aq) + AgCl (s)

Combination reaction.

Decomposition reaction.

Combustion reaction.

Exchange reaction.

Identify the reaction type for the following:
C₁₀H₈ (s) + 12O₂ (g) → 10 CO₂ (g) + 4 H₂O (l)

Combination reaction.

Decomposition reaction.

Combustion reaction.

Exchange reaction.

Correct.

Incorrect.

Question 3

The reaction between reactant A (smaller spheres) and reactant B (larger spheres) is shown in the diagram.

Based on this diagram, which equation best describes the reaction?

A + B₂ → AB₂

A₂ + 4 B → 2 AB₂

2 A + B₄ → 2 AB₂

A₂ + B → A₂B

Correct.

Incorrect.

The reaction between reactant A (smaller spheres) and reactant B (larger spheres) is shown in the diagram.

Based on this diagram, which equation best describes the reaction?

A2 + B → A2B

A2 + 4 B → 2 AB2

2 A + B4 → 2 AB2

A + B2 → AB2

Correct.

Incorrect.

The reaction between reactant A (smaller spheres) and reactant B (larger spheres) is shown in the diagram.

Based on this diagram, which equation best describes the reaction?

A2 + B → A2B

A2 + 4 B → 2 AB2

A + 2B → 2 AB2

A + B2 → AB2

Correct.

Incorrect.

The reaction between reactant A (smaller spheres) and reactant B (larger spheres) is shown in the diagram.

Based on this diagram, which equation best describes the reaction?

A2 + B → A2B

A2 + 4 B → 2 AB2

A + 2B → 2 AB2

A + B2 → AB2

Correct.

Incorrect.

Question 4

Four drops of solution “A” are combined with eight drops of solution “B” and a precipitate forms. The supernatant is then tested by combining it with solution “C” and the precipitate “AC” forms. Which inference is consistent with this observation?

The empirical formula must be AB₂.

In this experiment solution “A” was the limiting reactant.

In this experiment solution “B” was the limiting reactant.

In this experiment there is not a limiting reactant.

Four drops of solution “A” are combined with eight drops of solution “B” and a precipitate forms. The supernatant is then tested by combining it with solution “C” and the precipitate “BC” forms. Which inference is consistent with this observation?

The empirical formula must be AB₂.

In this experiment solution “A” was the limiting reactant.

In this experiment solution “B” was the limiting reactant.

In this experiment there is not a limiting reactant.

Correct.

Incorrect.

Question 5

H₂(g) and O₂(g) are being combined to produce H₂O (g). When will the hydrogen gas be in excess?

When equal amounts of H₂ (g) and O₂(g) are combined.

When the O₂ (g) is the limiting reactant.

When the H₂(g) is the limiting reactant.

Both (a) and (b) are correct.

Both (a) and (c) are correct.

H₂(g) and O₂(g) are being combined to produce H₂O (g). When will the hydrogen gas be the limiting reactant?

When equal amounts of H₂ (g) and O₂(g) are combined.

When the initial amount of O₂ (g) is twice that of the H₂ (g)

When the initial amount of H₂ (g) is twice that of the O₂ (g)

Both (a) and (b) are correct.

Both (a) and (c) are correct.

H₂(g) and O₂(g) are being combined to produce H₂O (g). When will the oxygen gas be the limiting reactant?

When equal amounts of H₂ (g) and O₂(g) are combined.

When the initial amount of O₂ (g) is twice that of the H₂ (g)

When the initial amount of H₂ (g) is twice that of the O₂ (g)

Both (a) and (b) are correct.

Both (a) and (c) are correct.

Correct.

Incorrect.

Activity results are being submitted...