Quantitative Chemistry

Question 1

What chemical principle does the following statement refer to? “The total mass of the reactants is always equal to the total mass of the products.”

Answer 1

conservation of mass

Question 2

After a chemical reaction, is the mass of the products bigger, smaller or the same as the reactants?

Answer 2

the same

Question 3

True or false? Mass is always conserved in chemical reactions.

Answer 3

true

Question 4

Is this equation balanced? H2 + O2 → H2O

Answer 4

no

Question 5

True or false? No atoms are gained or lost in a chemical reaction.

Answer 5

true

Question 6

2Mg + O2 → _________. What goes in the gap to create a balanced chemical equation?

Answer 6

2MgO

Question 7

True or false? You can follow the progress of a reaction that produces a gas using a sensitive mass balance, because the mass of the reaction vessel increases as the gas is produced.

Answer 7

false

Question 8

The total mass of the reactants is equal to the total mass of products. This is known as the conservation of what?

Answer 8

mass