Introduction to Stoichiometry — Unit test

Question 1

The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

Revolt · Accepted Answer

2

Question 2

Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

Revolt · Accepted Answer

1:1

Question 3

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

Revolt · Accepted Answer

8.25 mol

Question 4

Which statement best describes the difference between endothermic and exothermic reactions?

Revolt · Accepted Answer

They are opposites because endothermic reactions require energy and exothermic reactions release energy.

Question 5

Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.

Revolt · Accepted Answer

a chemical change, because a gas was produced

Question 6

When balanced, which equation would have the coefficient 3 in front of any of the reactants?

Revolt · Accepted Answer

H2SO4 + B(OH)3 B2(SO4)3 + H2O

Question 7

[BLANK]

Revolt · Accepted Answer

decomposition

Question 8

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Revolt · Accepted Answer

MgCl2

Question 9

Which statement best describes balancing equations and the law of conservation of mass?

Revolt · Accepted Answer

The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

Question 10

Which type of reaction is Mg + S → MgS?

Revolt · Accepted Answer

synthesis

Introduction to Stoichiometry — Unit test Answers

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