Booklet 3

Question 1

What is needed for rusting?

Answer 1

Water and Oxygen

Question 2

What is Rusting?

Answer 2

The corrosion of iron

Question 3

What is a disadvantage of physical barriers?

Answer 3

Stops working if the surface becomes scratched or broken

Question 4

What is galvanising?

Answer 4

Coating something in iron or zinc

Question 5

What is physical barrier protection?

Answer 5

Stops rusting by coating something to keep out air and water

Question 6

Name a disadvantage of sacrificial protection

Answer 6

Stops working when more reactive metal is used up

Question 7

Corrosion is what?

Answer 7

The Formation of a compound on the surface of a metal

Question 8

What metals are used for sacrificial metals?

Answer 8

Magnesium or Zinc

Question 9

What is rust?

Answer 9

Hydrated iron oxide

Question 10

Name some types of physical barriers

Answer 10

Paint,oil,grease,tin and other less reactive metals

Question 11

What speeds up rusting?

Answer 11

Salts or acids

Question 12

What metal is obtained from Bauxite?

Answer 12

Aluminium

Question 13

What metal is obtained from haematite?

Answer 13

Iron

Question 14

What metal is obtained from galena?

Answer 14

Lead

Question 15

What metal is obtained from cinnabar?

Answer 15

Mercury

Question 16

What metal is obtained from argentite?

Answer 16

Silver

Question 17

What does REDOX stand for?

Answer 17

Reduction and Reduction reactions

Question 18

What does potassium manganite decompose to produce?

Answer 18

Oxygen gas

Question 19

What decomposes to form oxygen and water? And what experiment is it from?

Answer 19

Hydrogen Peroxide (H2O2), the Elephants toothpaste experiment

Question 20

What is used in the elephants toothpaste experiment to speed up the reaction?

Answer 20

A catalyst

Question 21

Why does the chemical reaction in elephants toothpaste cause the chemical to push out of the container?

Answer 21

The oxygen gas is produced,since the molecules are further apart than liquids so the same number of molecules takes up more space and the oxygen quickly pushes it out of the container

Question 22

Combustion can be described as what?

Answer 22

A rapid, exothermic,oxidation reaction

Question 23

Define distiallation

Answer 23

Evaporation then condensation

Question 24

Define Decomposition

Answer 24

The breaking down of a molecule to form more than 1 product

Question 25

What does Sacrificial Protection involve?

Answer 25

Attaching iron to a more reactive metal

Question 26

What colour will UI turn if a solution is an acid,neutral,alkali?

Answer 26

Warm colour e.g red Green (only) Blue or purple

Question 27

What do acidic solutions tend to be?

Answer 27

Non-metals

Question 28

What do Alkalies tend to be?

Answer 28

Metal oxides

Question 29

What happens to elements which are burned in oxygen?

Answer 29

The are said to be oxidised

Question 30

What is the word equation for Rust?

Answer 30

Iron+oxygen+water -> hydrated iron oxide (rust)

Question 31

What is the percentage of oxygen in air?

Answer 31

20%

Question 32

In the experiment about how much air is used in rusting, how can you prove that the reaction is complete?

Answer 32

The water rises by 20% which is the amount of oxygen in air so it is reasonable to say rust has formed. (Oxygen has been used)

Question 33

Is corrosion a quick reaction?

Answer 33

No, but a more reactive metal can quicken the reaction

Question 34

Can rust form if only water or iron are present?

Answer 34

No the reaction requires both chemicals

Question 35

What does corrosion form to protect it from further rust?

Answer 35

An oxide layer

Question 36

What properties does rust have?

Answer 36

Brittle and weak, crumbles and breaks

Question 37

How can reduction be described?

Answer 37

The loss of oxygen

Question 38

In the reduction of copper oxide, what do you use or reduced the copper?

Answer 38

Carbon

Question 39

What is the word equation for the reduction of copper oxide?

Answer 39

Copper oxide + carbon -> copper + carbon dioxide

Question 40

If copper oxide has been reduced using Carbon, what has been oxidised?

Answer 40

Carbon

Question 41

What does stoichiometric mean?

Answer 41

Relating to quantities of reactants in simple integral ratios, as prescribed by an equation or formula. (Used in a thermit reaction p15)

Question 42

Name a metal which does not react with dilute acid

Answer 42

Sodium

Question 43

What alloy is used for bridges?

Answer 43

Steel, as it is strong

Question 44

What metal burns very brightly?

Answer 44

Magnesium

Question 45

What defines being easily beaten into shape?

Answer 45

Malleable