Reactivity series

Question 1

Reactivity series in order

Answer 1

potassium
sodium
lithium
calcium
magnesium
aluminium
carbon
zinc
iron
hydrogen
copper
silver
gold

Question 2

which metals will react with dilute acids

Answer 2

metals above hydrogen

Question 3

metal + acid ->

Answer 3

salt + hydrogen

Question 4

Mg + H2sSO4 ->

Answer 4

MgSO4 + H2

Question 5

does the reactivity increase or decrease going down the reactivity series

Answer 5

decreases

Question 6

a _____ reactive metal with displace a ____ reactive metal from its compound

Answer 6

1) more
2) less

Question 7

2 types of metal displacement reactions

Answer 7

1) reacting a metal with metal oxide (by heating)

2) reacting a metal with an aqueous solution of a metal compound

Question 8

Zn + CuO -> ?

Answer 8

ZnO + Cu

Question 9

how can the reactivity of 2 metals be compared

Answer 9

using displacement reactions

Question 10

state observations for magnesium and copper (II) sulfate solutions

Answer 10

• the blue color of CuSO4 fades and colorless magnesium sulfate is formed
• copper coats the surface of magnesium and forms solid metal at the bottom

Question 11

what is rusting

Answer 11

a chemical reaction between iron, water and oxygen

Question 12

what must be present for rusting to occur

Answer 12

oxygen and water

Question 13

where does rusting happen the fastest

Answer 13

salty water because NaCl speeds up reaction

Question 14

word equation for rusting

Answer 14

Iron + water + oxygen -> Hydrated Iron (III) Oxide

Question 15

symbol equation for rusting

Answer 15

4Fe (s) + 3O2(g) + xH2O (I) -> 2Fe2o3. x H2o (s)

Question 16

3 methods to prevent rusting

Answer 16

• barrier method
• galvanising
• sacrificial protection

Question 17

barrier method of rusting

Answer 17

• prevents iron from coming in contact with water and oxygen

Question 18

galvanising

Answer 18

process in which iron is protected by being coated with a layer of zinc

Question 19

how does zinc prevent iron from rusting

Answer 19

ZnCO3 is formed when zinc reacts with oxyen and co2 and protects the iron

Question 20

advantages of galvanising

Answer 20

even if scratched iron is still protected because zinc corrodes

Question 21

sacrificial corrosion

Answer 21

occurs when a more reactive metal is intentionally allowed to corrode

Question 22

oxidation reaction

Answer 22

when a substance gains oxygen

Question 23

reduction reaction

Answer 23

when a substance loses oxygen

Question 24

Zn + CuO -> ZnO + Cu
which gets oxidised and redoxed

Answer 24

• copper (II) oxide supplies the oxygen so it is the oxydising agent
• zinc is reducing agent as it removes the oxygen

Question 25

do atoms lose or gain electrons when oxidised

Answer 25

lose

Question 26

write the ionic equation for Mg in magnesium and copper sulfate

Answer 26

Mg -> Mg2+ + 2e-

Question 27

reduction is ____ of electrons

Answer 27

gain

Question 28

observations when reacting magnesium with HCL

Answer 28

• dissolves quickly
• gas is given off which goes pop
• colorless solution

Question 29

observations with iron and HCL

Answer 29

slow bubbling

Question 30

Observations with HCL and zinc

Answer 30

bubbles given off
metal slowly dissolves

Question 31

observations of Mg with sulfuric acid

Answer 31

rapid bubbling
splint goes pop
metal dissolves

Question 32

observations of Fe with sulfuric acid

Answer 32

slow reaction
small bubbles seen

Question 33

observations of Zn with sulfuric acid

Answer 33

-metal dissolves forming colorless solutions
-gas given off slowly