Reactions Of Metals With Oxygen

Question 1

What does it mean if there is a triangle over the chemical reaction arrow in a chemical equation?

Answer 1

Applying heat

Question 2

What two types of results can you get?

Answer 2

Qualitative

Quantitative

Question 3

What are qualitative results?

Answer 3

Results that use the five senses, i.e. What does it look like

Question 4

What are quantitative results?

Answer 4

Results that use numbers

Question 5

What three things can you do to prevent corrosion?

Answer 5

Painting/greasing/oiling
Electroplating
Galvanising

Question 6

What will happen to a metal left in the presence of Oxygen?

Answer 6

It will form a metal oxide through a chemical reaction

Question 7

What colour is copper oxide that occurs naturally?

Answer 7

Green

Question 8

What colour is copper oxide that forms in the presence of heat?

Answer 8

Black

Question 9

What flame occurs in the combustion of copper?

Answer 9

Green

Question 10

What does iron oxide look like when it reacts naturally?

Answer 10

Reddish brown flakes called rust

Question 11

What does iron oxide look like when it combusts?

Answer 11

Dark grey

Question 12

What is the oxide formed between Iron and Oxygen react with heat?

Answer 12

Magnetite

Question 13

What is the chemical formula for rust?

Answer 13

Fe2O3

Question 14

What colour is magnesium oxide?

Answer 14

White ash

Question 15

What is the reaction of magnesium oxide like?

Answer 15

Bright white flash

Rapid reaction

Question 16

What two metals are unlikely to react with oxygen?

Answer 16

Gold

Silver

Question 17

What protects fruit from an oxygen attack?

Answer 17

Their skin/peel

Question 18

What speeds up the rusting process? (Catalyst)

Answer 18

Water

Question 19

Why is rusting a bad thing?

Answer 19

It weakens iron and steel, which are used as supports for buildings, cars etc.

Question 20

What way can the rusting process be sped up even more?

Answer 20

Impurities (like salt) can be mixed in the water being used as the catalyst

Question 21

Why are metals like aluminium and chromium being used more often?

Answer 21

They are not damaged by oxygen attacks.

Question 22

How are aluminium and chromium protected?

Answer 22

The oxides of these metals form a layer (patina) around the metal, protecting the rest of the metal from the Oxygen

Question 23

What three methods can be used to protect iron from rusting?

Answer 23

Painting/greasing/oiling
Electroplating
Galvanising

Question 24

What is electroplating?

Answer 24

A negative current is sent through a plate of iron. The charged plate is then dipped into a bath of aluminium/chromium/ gold etc. These metals are attracted to the negatively charged iron, and so they coat the iron.

Question 25

What is galvanising?

Answer 25

When an iron plate is dipped into a bath of zinc

Question 26

Why does galvanising work?

Answer 26

Zinc oxide will form an extra layer around the zinc and zinc oxide, protecting both metals

Question 27

What colour is copper naturally?

Answer 27

Orange

Question 28

What flame is produced during the reaction between iron and oxygen in the presence of heat?

Answer 28

Orange sparks

Question 29

What is a patina?

Answer 29

A layer of metal oxide that forms on the metal

Question 30

What happens to water when it boils?

Answer 30

Oxygen gas is evaporated

The water is less likely to cause lots of rust

Question 31

What compound absorbs moisture?

Answer 31

Calcium chloride