5.22 - Writing chemical equations

Question 1

What are the 4 state symbols, and what do they mean?

Answer 1

(s) = Solid
(l) = Liquid
(g) = Gas
(aq) = Aqueous

Question 2

What does it mean if an equation is balanced?

Answer 2

There are the same amount of each atom on each side of the equation

Question 3

How would you balance the following equation?

C4H10 + O2 -> CO2 + H2O

Answer 3

• Add 6.5 in front of the O2
• Add 4 in front of the CO2
• Add 5 in front of the H2O

Question 4

What are these numbers that go in front of the compounds known as?

Answer 4

Coefficients

Question 5

What does a conventional arrow look like?

Answer 5

->

Question 6

What symbol is used in a reversible reaction equation, instead of the conventional arrow?

Answer 6

↔

Question 7

What is an ionic equation?

Answer 7

A type of equation that shows how ions change in a reaction

Question 8

What are the ions that don’t change in a reaction called? Are these included in ionic equations?

Answer 8

Spectator ions, they aren’t included in ionic equations

Question 9

What are ionic half-equations?

Answer 9

Equations that show either oxidation or reduction in a reaction. They occur in electrolysis most of the time