Reactions Of Metals With Oxygen Flashcards Preview

Abi Science 2016 > Reactions Of Metals With Oxygen > Flashcards

Flashcards in Reactions Of Metals With Oxygen Deck (31):
1

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

Applying heat

2

What two types of results can you get?

Qualitative
Quantitative

3

What are qualitative results?

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

4

What are quantitative results?

Results that use numbers

5

What three things can you do to prevent corrosion?

Painting/greasing/oiling
Electroplating
Galvanising

6

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

It will form a metal oxide through a chemical reaction

7

What colour is copper oxide that occurs naturally?

Green

8

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

Black

9

What flame occurs in the combustion of copper?

Green

10

What does iron oxide look like when it reacts naturally?

Reddish brown flakes called rust

11

What does iron oxide look like when it combusts?

Dark grey

12

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

Magnetite

13

What is the chemical formula for rust?

Fe2O3

14

What colour is magnesium oxide?

White ash

15

What is the reaction of magnesium oxide like?

Bright white flash
Rapid reaction

16

What two metals are unlikely to react with oxygen?

Gold
Silver

17

What protects fruit from an oxygen attack?

Their skin/peel

18

What speeds up the rusting process? (Catalyst)

Water

19

Why is rusting a bad thing?

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

20

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

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

21

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

They are not damaged by oxygen attacks.

22

How are aluminium and chromium protected?

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

23

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

Painting/greasing/oiling
Electroplating
Galvanising

24

What is electroplating?

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.

25

What is galvanising?

When an iron plate is dipped into a bath of zinc

26

Why does galvanising work?

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

27

What colour is copper naturally?

Orange

28

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

Orange sparks

29

What is a patina?

A layer of metal oxide that forms on the metal

30

What happens to water when it boils?

Oxygen gas is evaporated
The water is less likely to cause lots of rust

31

What compound absorbs moisture?

Calcium chloride