Chemical Changes

Question 1

What is highest in the reactivity series?

Answer 1

Potassium

Question 2

What is lowest in the reactivity series?

Answer 2

Gold

Question 3

How does the reactivity series help in the extraction of a metal?

Answer 3

The reactivity series helps you decide the best way to extract a metal from its ore.

Question 4

What is a salt?

Answer 4

A salt is a compound formed when the hydrogen in an acid is wholly or partially replaced by metal or ammonium ions.

Question 5

How can salts be made?

Answer 5

Slats can be made by reacting a suitable metal with an acid. The metal must be above hydrogen in the reactivity series, but not dangerously reactive.

Question 6

What does the reaction between and acid and a base produce?

Answer 6

It produces salt and water

Question 7

When is an indicator needed?

Answer 7

When a soluble salt is prepared by reacting an alkali with an acid

Question 8

What do acids produce when added to water?

Answer 8

H+ ions

Question 9

Which substances will neutralise acids?

Answer 9

Bases

Question 10

What can you use the PH scale for?

Answer 10

To show how acidic or alkaline a solution is

Question 11

Solutions with PH values less than 7 are…?

Answer 11

Acidic

Question 12

Solutions with PH values more than 7 are…?

Answer 12

Alkaline

Question 13

A PH value of 7 indicates…?

Answer 13

Neutral solution