Chemical Changes

Question 1

Is carbon more or less reactive than iron?

Answer 1

More reactive

Question 2

Silver does not corrode in air or water. What is a word to describe this?

Answer 2

Unreactive

Question 3

Which of the following reacts vigorously with cold water?

Sodium,Magnesium,Zinc,Copper

Answer 3

Sodium

Question 4

…. reactions involve both oxidation and reduction.What is the word?

Answer 4

Redox reactions

Question 5

Acid + metal ->

Answer 5

Salt + hydrogen

Question 6

Acid + metal hydroxide ->

Answer 6

Salt + water

Question 7

Acid + metal carbonate ->

Answer 7

Salt + water + carbon dioxide

Question 8

Acid + metal oxide ->

Answer 8

Salt + water

Question 9

What is the formulae for hydrochloric acid?

Answer 9

Hcl

Question 10

What is the formula for sulphuric acid?

Answer 10

H2 SO4

Question 11

What is the formula of nitric acid?

Answer 11

HNO3

Question 12

Salts that are made with hydrochloric acid are called …

Answer 12

Chlorides

Question 13

Metal + oxygen ->

Answer 13

Metal oxide

Question 14

Metal + water ->

Answer 14

Metal hydroxide + hydrogen

Question 15

Acid + base ->

Answer 15

Salt + water

Question 16

Acid + alkali ->

Answer 16

Salt + water

Question 17

Salts that are made with sulphuric acid make…

Answer 17

Sulphates

Question 18

Salts that are made with nitric acid make…

Answer 18

Nitrates

Question 19

Oxidation is where …

Answer 19

Electrons are lost or oxygen is gained

Question 20

Reduction is where…

Answer 20

Electrons are gained or oxygen is lost

Question 21

What is an alkali?

Answer 21

8-14 on the ph scale and turns universal indicator blue

Question 22

What will a base do?

Answer 22

It will neutralise an acid

Question 23

What is an ion?

Answer 23

An atom with a charge and a full outer shell

Question 24

What is a displacement reaction?

Answer 24

Where one reactant is more reactive than the other so the less reactive one is displaced

Question 25

How do you make a soluble salt? (RPA)

Answer 25

Start with a fixed volume of sulfuric acid - limiting reactant Gently heat the acid until almost boiling Use a spatula to add small amounts of copper oxide to the acid Stir the solution with a glass rod Continue adding copper oxide if the solution continues to be clear blue Stop adding copper oxide if powder remains after stirring Use filtration to filter the unreacted copper oxide Place solution in an evaporating basin and heat gently over a beaker of boiling water until only half the solution is remaining Leave solution for 24 hours in a cool place for crystals to form Scrape crystals onto a paper towel and gently pat them dry