Chemical Changes

Question 1

Bronze

Answer 1

Alloy copper and tin

Question 2

Brass

Answer 2

Alloy copper and zinc

Question 3

Gold

Answer 3

Can be alloyed with silver, copper and zinc

Question 4

Percentage purity gold

Answer 4

Carat number/24 x100

Question 5

Steel

Answer 5

Alloy iron, carbon and other materials

Question 6

High carbon steel

Answer 6

Strong but brittle

Question 7

Low carbon steel

Answer 7

• softer, more maleable

- car body work

Question 8

Stainless steel

Answer 8

Steel with chromium and nickel

• hard, restistant to corrosion
• cutlery

Question 9

Aluminium alloy

Answer 9

Low density

Question 10

Base

Answer 10

Any substance thatreacts with an acid to form salt and water only

Question 11

Potassium reaction

Answer 11

With cold water

-fizzig and lilac flame

Question 12

Sodium reaction

Answer 12

Reacts with sold water

-moves spins, melt into ball, dissolve

Question 13

Lithium reaction

Answer 13

Reacts with cold water

-fizzes, dissolves into water

Question 14

Calcium reaction

Answer 14

Reacts with cold water

-bubbles violently, white precipitat

Question 15

Magnesium

Answer 15

Reacts hot water

-bubbles come of

Question 16

Zinc

Answer 16

Reacts with acid

-fizzes, white precipitate

Question 17

Iron reaction

Answer 17

Reacts with hot acid

-fizzes, white precipitate

Question 18

Lead reaction

Answer 18

Doesnt react with acid and water

Question 19

Metal + acid

Answer 19

Salt + hydrogen

Question 20

Metal oxide + acid

Answer 20

Salt + water

Question 21

Metal hydroxide + acid

Answer 21

Salt + water

Question 22

Metal carbonate + acid

Answer 22

Salt + water + carbon dioxide

Question 23

Hydrochloric acid salt name

Answer 23

Chloride

Question 24

Sulphuric acid salt name

Answer 24

Sulphate

Question 25

Nitric acid salt name

Answer 25

Nitrate

Question 26

Phosphoric acid salt name

Answer 26

Phosphate

Question 27

Ethanoic acid salt name

Answer 27

Ethanoate

Question 28

Metals that react with acid to produce salt and hydrogen

Answer 28

Magnesium, zinc, iron. + hyrdochloric and sulphuric acid

Question 29

Metal + water

Answer 29

Metal hydroxide + hydrogen (oxidation)

Question 30

Thermite reaction

Answer 30

Mixture metal powder and metal oxide

Question 31

Methyl orange

Answer 31

Red to yellow

Question 32

Phenothalein

Answer 32

Colourless to pink

Question 33

Red litmus paper

Answer 33

Red- acid and neutral | Blue-alkali

Question 34

Blue litmus paper

Answer 34

Red- acid | Blue-alkali and neutral

Question 35

Universal indicator

Answer 35

Acid- deep red to light green Neutral- dark green Alkali- dark blue to light blue/turquoise