SC11a Reactivity

Question 1

what metals react with cold water?

Answer 1

sodium, calcium and potassium

Question 2

how does calcium react with cold water?

Answer 2

reacts steadily with water and effervescence (fizzing) is seen as the hydrogen is produced.​

Question 3

how does potassium react with cold water?

Answer 3

floats on the water, melts, moves around, fizzes, the hydrogen burns and a lilac flame is seen.​

Question 4

how does sodium react with cold water?

Answer 4

floats on the water, melts, moves around and fizzes

Question 5

Sodium + water →
2Na(s) + 2H2O(l) →

Answer 5

sodium hydroxide + hydrogen​
2NaOH(aq) + H2(g)​

Question 6

what metals do not react with dilute acids?

Answer 6

gold, silver and copper

Question 7

what does the reaction between dilute acids and metals produce?

Answer 7

salt and hydrogen

Question 8

Mg(s) + H2SO4(aq) →

Answer 8

MgSO4(aq) + H2(g)​

Question 9

Write the equation for the reaction between zinc and dilute sulfuric acid. Include state symbols.​

Answer 9

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g)​

Question 10

reactivity series in order?

Answer 10

potassium​
sodium​
calcium​
magnesium​
zinc​
iron​
copper​
silver​
gold​

Question 11

the more reactive the metal the greater the tendency for met….

Answer 11

metal atoms to lose electrons to form cations (positive ions).​

Question 12

what happens easier when a metal is high on the reactivity series?

Answer 12

more easily metal atoms lose electrons

Question 13

how does potassium, calcium and sodium react with water?

Answer 13

react with cold water to form hydrogen and a metal hydroxide

Question 14

how does magnesium, aluminium, zinc and iron react with water?

Answer 14

react very slowly, if at all, with cold water but react with steam to form hydrogen and a metal oxide

Question 15

how does copper, silver and gold react with water?

Answer 15

do not react with cold water or steam

Question 16

how does potassium and sodium react with dilute acid?

Answer 16

react violently

Question 17

how does calcium, magnesium, aluminium, zinc and iron react with dilute acid?

Answer 17

react to form hydrogen and a salt solution

Question 18

how does copper, silver and gold react with dilute acid?

Answer 18

do not react

Question 19

when will a metal displace another metal?

Answer 19

metals only displace a less reactive metal from its salt solution?

Question 20

Zn(s) + CuSO4(aq) →

Answer 20

Cu(s) + ZnSO4(aq)

Question 21

zinc can displace copper but can copper displace zinc?

Answer 21

no as copper is less reactive

Question 22

write the equation for the reaction between magnesium and zinc chloride solution. Include state symbols.

Answer 22

Mg(s) + ZnCl2(aq) → MgCl2(aq) + Zn(s)

Question 23

2. Write the equation for the reaction between copper and silver nitrate solution, AgNO3(aq). Include state symbols.

Answer 23

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)

Question 24

what is a redox reaction?

Answer 24

a reaction in which one substance is oxidised another is reduced).​

Question 25

make this into a ionic equation and half equation
Mg(s) + ZnCl2(aq) → MgCl2(aq) + Zn(s)​

Answer 25

The reaction above can be written as the ionic equation:​
Mg(s) + Zn2+(aq) + 2Cl-(aq) → Mg2+(aq) + 2Cl-(aq) + Zn(s)​
The chloride ions are spectator ions as they do not change.​

The ionic equation can be split into two half equations:​
Mg(s) → Mg2+(aq) + 2e-​
Zn2+(aq) + 2e- → Zn(s)​