Conservation Of Mass

Question 1

Total mass of the products of a chemical reaction is always …..

Answer 1

Equal to the total mass of reactants, this is because no atoms are lost or made

Question 2

What is relative formula mass of a compound (Mr)

Answer 2

Sum of relative atomic masses (Ar)

Question 3

Relative formula mass of CO2

Answer 3

(12x1) + (16x2)

= 44

Question 4

Why do some reactions appear to involve a change in mass

Answer 4

-real-time are carried out in a non-closed system and include a gas that can enter or leave