5.2 Equations for chemical reactions

Question 1

What are reactants sometimes also called?

Answer 1

Reactants are sometimes also called reagents.

Question 2

What are reactants?

Answer 2

The substances that take part in and undergoes change during a reaction.

Question 3

What is the product?

Answer 3

The product is the substance that is present at the end of a chemical reaction.

Question 4

When is the equation balanced?

Answer 4

When the number of each type of atom is the same on both sides, the symbol equation is balanced.

Question 5

Why are the number of each type of atoms the same on both sides of the arrow?

Answer 5

The number of each types of atoms is the same on both sides of the arrow because atoms do not dissapear during a reaction. They are just rearranged.

Question 6

What are the 4 states of reactants and products?

Answer 6

Reactants and products may be solids, liquids, gases, or in solution.

Question 7

State symbol for solids

Answer 7

(s)

Question 8

State symbol for liquid

Answer 8

(l)

Question 9

State symbol for gas

Answer 9

(g)

Question 10

State symbol for aqueous solution (solution in water)

Answer 10

(aq)

Question 11

How to write the equation for a reaction

Answer 11

These are the steps to follow when writing an equation:

1.Write the equation in words.
2. Now write it using symbols. Make sure all the formulae are correct.
3. Check that the equation is balanced, for each type of atom in turn.
4. Add the state symbols.