4 Chemical Changes - Reactivity Series H only

Question 1

What is the reactivity series?

Answer 1

A list of elements ordered by their reactivity

Question 2

How can metals be placed in order of their reactivity?

Answer 2

Add the metals to water or acid and see which ones react the most (by how much fizzing there is)

Question 3

What is the name for a reaction where oxygen is removed from a compound?

Answer 3

Reduction

Question 4

Explain why zinc can be extracted from zinc oxide with carbon but magnesium cannot be extracted from magnesium oxide with carbon

Answer 4

Magnesium is more reactive than carbon (1), Zinc is less reactive than carbon (1), Carbon can therefore remove oxygen from zinc oxide but not magnesium oxide (1)

Question 5

Explain why gold and silver can be found naturally in the Earth’s crust

Answer 5

It is very unreactive

Question 6

What process is used to extract metals more reactive than carbon

Answer 6

Electrolysis

Question 7

Define an ore

Answer 7

A material containing enough metal in it for it to be economically worthwhile to extract the metal.

Question 8

Define a displacement reaction

Answer 8

A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution

Question 9

Define oxidation in the context of loss and gain of electrons

Answer 9

Oxidation is the loss of electrons

Question 10

Define reduction in the context of loss and gain of electrons

Answer 10

Reduction is the gain of electrons

Question 11

Which of the substances below has been oxidized and which has been reduced? Al3+ + Fe gives Fe3+ + Al

Answer 11

Aluminium has been reduced and iron has been oxidised

Question 12

Show two half equations for the reaction below: Al3+ + Fe gives Fe3+ + Al

Answer 12

Al3+ + 3e- gives Al , Fe gives Fe3+ + 3e-

Question 13

Which ions are in NaCl

Answer 13

Na+ and Cl-

Question 14

Which ions are in CaCO2

Answer 14

Ca2+ and CO2 2-

Question 15

Which ions are in Mg(OH)2

Answer 15

Mg2+ and 2 ions of OH-

Question 16

Which ions are in H2SO4

Answer 16

2 ions of H+ and one SO4 2-

Question 17

Which ions are in NH3OH

Answer 17

NH3+ and OH-

Question 18

Which ions are in (NH3)2O

Answer 18

2 ions of NH3+ and one O2-

Question 19

What is the formula of calcium chloride?

Answer 19

CaCl2

Question 20

What is the formula of aluminium nitrate?

Answer 20

Al(NO3)3

Question 21

What is the formula of iron (III) oxide?

Answer 21

Fe2O3

Question 22

What is the formula of magnesium fluoride?

Answer 22

MgF2

Question 23

What is the formula of sodium sulphate?

Answer 23

Na2SO4

Question 24

What is the formula of copper (I) oxide

Answer 24

Cu2O

Question 25

Is this process oxidation or reduction? Al gives Al3+ + 3e-

Answer 25

Oxidation

Question 26

Is this process oxidation or reduction? Na+ + e- gives Na

Answer 26

Reduction

Question 27

Is this process oxidation or reduction? F2 + 2e- gives 2F-

Answer 27

Reduction

Question 28

Is this process oxidation or reduction? Fe2+ gives Fe3+ + e-

Answer 28

Oxidation

Question 29

Balance this ionic equation: Ca + Na+ gives Ca2+ + Na

Answer 29

Ca + 2Na+ gives Ca2+ + 2Na

Question 30

Balance this ionic equation: Mg2+ + Na gives Na+ + Mg

Answer 30

Mg2+ + 2Na gives 2Na+ + Mg

Question 31

Balance this ionic equation: Al + C2+ gives Al3+ + Ca

Answer 31

2Al + 3Ca2+ gives 2Al3+ + 3Ca