BMST - Basic Math and Science Chemical Reactions and Stoichiometry Questions and Answers 2

Question 1

In a balanced chemical equation, what is conserved?

Accepted Answer

Mass and the number of atoms of each element

Answer

Only the number of molecules

Answer

The volume of reactants

Answer

The temperature of the system

Question 2

What is the molar mass of water (H₂O)?

Accepted Answer

18 g/mol

Answer

16 g/mol

Answer

20 g/mol

Answer

36 g/mol

Question 3

What type of reaction is: 2H₂ + O₂ → 2H₂O?

Accepted Answer

Synthesis (combination)

Answer

Decomposition

Answer

Single replacement

Answer

Double replacement

Question 4

How many moles are in 44 grams of CO₂?

Accepted Answer

1 mole

Answer

2 moles

Answer

0.5 moles

Answer

44 moles

Question 5

What is a catalyst?

Accepted Answer

A substance that speeds up a reaction without being consumed

Answer

A reactant that is always used up

Answer

A product of every chemical reaction

Answer

A type of element on the periodic table

Question 6

In the reaction Fe + CuSO₄ → FeSO₄ + Cu, what type of reaction is this?

Accepted Answer

Single replacement

Answer

Double replacement

Answer

Synthesis

Answer

Decomposition