Chemical Changes

Question 1

Metal + Oxygen =

Answer 1

A metal oxide

Question 2

Gaining oxygen is called an…

Answer 2

Oxidation reaction

Question 3

Losing oxygen is called a…

Answer 3

Reduction reaction

Question 4

During oxidation metal atoms _____ electrons

Answer 4

lose

Question 5

During a reduction reaction metal atoms ____ electrons

Answer 5

gain

Question 6

Alkalis produce ___ ions in water

Answer 6

OH- ions

Question 7

Acids produce __ ions in water

Answer 7

H+ ions

Question 8

Metal + water =

Answer 8

Metal hydroxide + hydrogen

Question 9

What happens when metals react in terms of electrons?

Answer 9

They lose electrons and form positive ions

Question 10

What does the reactivity of a metal depend on ?

Answer 10

Its ability to lose electrons and form a positive ion

Question 11

What happens when you introduce a more reactive metal to a compound?

Answer 11

The other metal will be displaced

Question 12

Whats the formula for Hydrochloric Acid?

Answer 12

HCl

Question 13

Whats the formula for Sulfuric Acid?

Answer 13

H2SO4

Question 14

Whats the formula for Nitric Acid?

Answer 14

HNO3

Question 15

What is a base?

Answer 15

A chemical which can neutralise acids.

Question 16

Bases are usualy ….?

Answer 16

Metal Hydroxides or Metal Oxides

Question 17

What is an alkali?

Answer 17

A base that is dissolved in water

Question 18

What is the ionic equation for an acid and an alkali?

Answer 18

H+ (aq) + OH- —> H20 (l)

Question 19

Metal + Acid =

Answer 19

Salt + Hydrogen

Question 20

What salts do HCl produce?

Answer 20

• chloride salts

Question 21

What salts do sulfuric acid produce?

Answer 21

• sulfate salts

Question 22

What salts do nitric acid produce?

Answer 22

• nitrate salts

Question 23

Why does magnesium react rapidly with acid?

Answer 23

Because its more reactive than hydrogen, which means it can easily displace hydrogen from acids.

Question 24

Which type of reaction is the loss of electrons?

Answer 24

Oxidation

Question 25

What type of reaction is the gain of electrons?

Answer 25

Reduction

Question 26

Why can we use Carbon to extract Iron from Iron Oxide?

Answer 26

Carbon is more reactive than iron so it displaces it in its compound.

Question 27

carbon + iron oxide = carbon dioxide + iron Which element is oxidised and which is reduced?

Answer 27

Carbon is oxidised and Iron is reduced

Question 28

Mg —> Mg [2+] + e- Has Magnesium been oxidised or reduced?

Answer 28

Oxidised

Question 29

S + 2e- —> S2- Has sulfur been oxidised or reduced

Answer 29

Reduced

Question 30

Acid + Base =

Answer 30

Salt + Water

Question 31

Acid + Base =

Answer 31

Salt + Water

Question 32

pH is a logarithmic scale. What is meant by logarithmic?

Answer 32

It doesn’t increase by a set number each time. The concentration of H+ ions in something of pH 4 is 10x more than something of pH 5

Question 33

Acid + Metal Carbonate =

Answer 33

Salt + Water + Carbon Dioxide

Question 34

What is meant by a strong acid?

Answer 34

An acid that fully dissociates into its ions in water