C5 - Chemical Changes

Question 1

What is a neutralisation?

Answer 1

A reaction that occurs between an acid and a base

Question 2

What is the difference between a base and an alkalis?

Answer 2

Many bases are insoluble in water (including ALL metal oxides and SOME metal hydroxides) whereas alkalis are bases which are soluble in water

Question 3

What are the reactants and products of a neutralisation reaction?

Answer 3

Acid + base —> salt + water

Question 4

Where does the product water come from?

Answer 4

The H+ ions in the ACID and the OH- ions in the BASE

Question 5

Whats the difference between strong acids and weak acids?

Answer 5

•strong acids fully ionise in water/aqueous solution
•weak acids only partially ionise in water/aqueous solution

Question 6

What does a having a higher pH mean for an acid?

Answer 6

Less acidic

Question 7

What happens as pH decreases by one unit?

Answer 7

The hydrogen ion of the solution increases by a factor of 10

Question 8

What does it mean if a solution has a pH of 7?

Answer 8

It is neutral