Practice Test

Question 1

What has occurred? Ciara’s bike has rusted, which means that the iron in the metal changed to rust.

Revolt · Accepted Answer

a chemical reaction

Question 2

What else is produced during the replacement reaction of magnesium and hydrochloric acid? Mg plus 2 HCl rightarrow cap h sub 2 plus ______

Revolt · Accepted Answer

MgCl sub 2

Question 3

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 4

A chemical reaction that has the general formula of AB rightarrow cap A plus cap b is best classified as a [Dropdown 1] reaction.

Revolt · Accepted Answer

[Dropdown 1] decomposition; decomposition

Question 5

In the reaction cap c plus cap o sub 2 rightarrow CO sub 2 , 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

Revolt · Accepted Answer

54 g

Question 6

Which represents an endothermic reaction?

Revolt · Accepted Answer

splitting a gas molecule

Question 7

The equation for water is cap h sub 2 plus cap o sub 2 rightarrow cap h sub 2 cap o To balance the equation, which coefficient should be placed in front of cap h sub 2 and cap h sub 2 cap o ?

Revolt · Accepted Answer

2

Question 8

Which best represents the reaction of calcium and zinc carbonate open paren ZnCO sub 3 close paren to form calcium carbonate open paren CaCO sub 3 close paren and zinc?

Revolt · Accepted Answer

Ca plus ZnCO sub 3 rightarrow CaCO sub 3 plus Zn

Practice Test Answers

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