Chemical Reactions Quiz

Which of the following is a balanced chemical equation?

• N₂ + O₂ → 2N₂O

• 2Al + 3NiBr₂ → 2AlBr3 + 3Ni

• KI + Cl₂ → 2KCl + I₂

• All the above are balanced chemical equations.

How many moles of ammonia are produced by the following reaction?

• 1

• 2

• 3

• 6

Which of the following are evidences of a chemical change?

• A precipitate forms.

• Bubbles form.

• A change in color occurs.

• A change in phase from a liquid to a gas occurs.

• A change in temperature occurs.

A combination of chemical formulas and symbols that models a chemical reaction is a(n) chemical equation.

The mass of one mole of a substance is its molar mass.

What kind of reaction occurs when water breaks up into hydrogen and oxygen gas?

• decomposition

• double-replacement

• single-replacement

• synthesis

What kind of reaction is Ba + 2HCl → BaCl₂ + H₂?

• decomposition

• double-replacement

• single-replacement

• synthesis

The term oxidation is used today to refer to

• any reaction that burns.

• any reaction where electrons are lost.

• fuel reacting with oxygen.

• reactions between metals and oxygen.

(True or False) Oxygen must be present for a combustion reaction to occur.

(True or False) Oxygen must be present for an oxidation reaction to occur.