Equations and Calculations

Question 1

Balanced equations have what on each side?

Answer 1

Equal numbers of each atom on both sides

Question 2

How do you add more atoms to an equation?

Answer 2

You add more atoms by adding whole reactants or products. You do this by putting a whole number in front of a substance that’s already in the equation

Question 3

What do ionic equations show?

Answer 3

In ionic equations only show the reacting particles (and the products they form) are included

Question 4

How do you write ionic equations?

Answer 4

Break up the ionic substances in the equation to show all the ions in the reaction mixture. Cross out any ions that appear on both sides. Re write the equation with the remaining ions

Question 5

What is a state symbol?

Answer 5

A state symbol tells you the state of matter things are in. They are put after each reactant or products in an equation

Question 6

What are the state symbols?

Answer 6

s = solid
l = liquid
g = gas
aq = aqueous (solution in water)

Question 7

Balanced equations can be used to work out what?

Answer 7

Masses and gas volumes