Obtaining Useful Materials

Question 1

What are catalysts

Answer 1

These are substances that speed up chemical reactions

Biological form: enzymes

Question 2

What are acid reactions?

Answer 2

Metal+acid-metal salt+hydrogen

Question 3

What are water reactions?

Answer 3

Metal+water-metal compound (hydroxide)+hydrogen

Question 4

Give four examples of composites

Answer 4

Concrete. Mongolis. Bricks/carbon fibre. Cermets

Question 5

What is a composite?

Answer 5

Two or more materials with different properties added together to make a stronger material than the original.

Question 6

What is a polymer?

Answer 6

A chemical made of VERY long chains of repeating chemical units called monomers. Two different monomers are starch and cellulose.

Polymer=chain
Monomer=link

Question 7

List the reactivity series

Answer 7

Potassium
Sodium
Calcium
Magnesium
Aluminium
Zinc
Iron
Tin 
Lead 
Copper
Silver
Gold

Question 8

What is a ceramic?

Answer 8

An inorganic (not carbon) non metallic solid. Heat and cooling.

Question 9

Give examples of ceramics

Answer 9

Tiles. Glass. Brick. Plates and vases. Ornaments.

Question 10

Give 2 types of ceramic

Answer 10

Crystalline (metal oxide) and amorphous (glass based)

Question 11

What is an exothermic reaction?

Answer 11

When heat is released to the surroundings (CHEMICAL REACTION)

E.g heaters, combustion and the emit reactions

Question 12

What is an endothermic reaction?

Answer 12

When heat is taken from its surroundings (CHEMICAL REACTION)

E.g photosynthesis and cold packs

Question 13

Activation energy

Answer 13

Amount of energy to get a reaction to start

Question 14

Using carbon to extract metal

Answer 14

Metal oxide+carbon-Metal+carbon oxide