Chemical Change

Question 1

In oxidation

Answer 1

Loss of electrons

Often gains oxygen

Question 2

In reduction

Answer 2

Gain if electrons

Often loses oxygen

Question 3

What always occur together

Answer 3

Oxidation and reduction

Question 4

Metals form with oxygen to form

Answer 4

Metal oxides

Question 5

When metals react they

Answer 5

Lose electrons to form positive metal ions

Question 6

The more easily a metal atom loses electrons, the more

Answer 6

Reactive it is

Question 7

Metals react with acids to produce

Answer 7

Metal salt and hydrogen

Question 8

In displacement reactions

Answer 8

A more reactive metal will displace a less reactive metal from a solution of its salt

Question 9

Extraction of metal depends on

Answer 9

How reactive it is

Question 10

When substances dissolve in water they..

Answer 10

Dissociate into their individual ions

Question 11

Hudroxide ions make solutions

Answer 11

Alkaline

Question 12

Hydrogen ions make solutions

Answer 12

Acidic

Question 13

The ph scale is a measure of

Answer 13

The acidity or alkalinity of a aqueous soloution

Question 14

Soliciting with ph 7 is

Answer 14

Neutral

Question 15

Less than PH 7 is

Answer 15

Acidic

Question 16

PH more than 7 are

Answer 16

Alkaline

Question 17

Ph of a solution can be measured using

Answer 17

Universal indicator of ph probe for more accurate

Question 18

Litmus paper

Answer 18

Change from blue or red

Question 19

Solouble bases are called

Answer 19

Alkalis

Question 20

Acids are neutralised by

Answer 20

Bases

Question 21

Acid+ metal hydroxide—->

Answer 21

Salt+water

Question 22

Acids contain

Answer 22

Hydrogen ions

Question 23

Alkalis contain

Answer 23

Hydroxide ions

Question 24

Acid+ metal oxide/—>

Answer 24

Salt+water

Question 25

Acid+ metal carbonate—->

Answer 25

Salt+water+carbon dioxide

Question 26

A salt is produced when

Answer 26

The hydrogen in the acid is replaced by a metal ion

Question 27

Hydrochloric acid produces(salt)

Answer 27

Chloride salts

Question 28

Nitric acid produce(salt)

Answer 28

Nitrate salts

Question 29

Sulfureux acid produces(salt)

Answer 29

Sulfate slats

Question 30

Hydrochloric strong or weak

Answer 30

Strong

Question 31

Ethanoic acid weak/strong

Answer 31

Weak

Question 32

PH of a solution is a measure of the concentration of

Answer 32

H+ ions

Question 33

Cryolite

Answer 33

Lowers the melting point of something | Cheaper