3.2.3 Group 7

Question 1

Name the type of reaction

NaCl(s) + H2SO4(aq) –> NaHSO4(s) + HCl(g)

Answer 1

Acid Base

Question 2

Give the products of the equation

NaCl(s) + H2SO4(aq) –>

Answer 2

NaHSO4(s) + HCl(g)

Question 3

Name the type of reaction

NaF(s) + H2SO4(aq) –> NaHSO4(s) + HF(g)

Answer 3

Acid Base

Question 4

State the observation for this reaction

NaCl(s) + H2SO4(aq) –> NaHSO4(s) + HCl(g)

Answer 4

Steamy Fumes

Question 5

State the observation for this reaction

NaF(s) + H2SO4(aq) –> NaHSO4(s) + HF(g)

Answer 5

Steamy Fumes

Question 6

Give the products of the equation

NaF(s) + H2SO4(aq) –>

Answer 6

NaHSO4(s) + HF(g)

Question 7

Give the half equation for the oxidation of bromide ions

Answer 7

2Br- –> Br2 + 2e-

Question 8

What is the sulfur product formed when bromide ions reactant with sulfuric acid in a redox reaction

Answer 8

SO2

Question 9

What is the observed when bromide ions reactant with sulfuric acid in a redox reaction

Answer 9

Acidic gas (SO2)
Brown fumes (Br2)

Question 10

State the three different sulfur products that can be formed when iodide ions react with sulfuric acid in a redox reaction.

Answer 10

Sulfur dioxide (SO2)
Sulfur (S)
Hydrogen sulfide (H2S)

Question 11

What is the observation when iodine is formed in a reaction with sulfuric acid?

Answer 11

Black solid

Question 12

What is the observation when H2S is formed in a reaction with sulfuric acid?

Answer 12

Bad egg smell

Question 13

What is the observation when sulphur is formed in a reaction using sulfuric acid?

Answer 13

Yellow solid

Question 14

What is the observation when SO2 is formed in a reaction using sulfuric acid?

Answer 14

Acidic gas

Question 15

A yellow solid and a black solid are formed when which two reactants react?

Answer 15

Iodide ions (I-) and sulfuric acid (H2SO4)

Question 16

What is observed when this reaction occurs?

Ag+(aq) + F-(aq) –> AgF(aq)

Answer 16

Colourless solution

Question 17

What is observed when this reaction occurs?

Ag+(aq) + Cl-(aq) –> AgCl(aq)

Answer 17

White precipitate

Question 18

What is observed when this reaction occurs?

Ag+(aq) + Br-(aq) –> AgBr(aq)

Answer 18

Cream precipitate

Question 19

What is observed when this reaction occurs?

Ag+(aq) + I-(aq) –> AgI(aq)

Answer 19

Yellow precipitate

Question 20

What is the test for halide ions?

Answer 20

Acidified silver nitrate (AgNO3)

Question 21

Why must a halide solution be acidified before testing with silver nitrate?

Answer 21

To remove carbonate ions

Question 22

What is observed when dilute ammonia (NH3) is added to AgCl

Answer 22

White precipitate dissolves

Question 23

What is observed when dilute ammonia (NH3) is added to AgBr

Answer 23

Cream precipitate remains

Question 24

What is observed when conentrated ammonia (NH3) is added to AgBr

Answer 24

Cream precipitate dissolves

Question 25

What is observed when conentrated ammonia (NH3) is added to AgI

Answer 25

Yellow precipitate remains

Question 26

Why is chlorine added to drinking water?

Answer 26

To kill bacteria

Question 27

# Give the products of the equation Cl2(g) + H2O(l) -->

Answer 27

HClO(aq) + HCl(aq)

Question 28

# Give the products of the equation Cl2(g) + 2NaOH(aq) -->

Answer 28

NaClO(aq) + NaCl(aq) + H2O(l)

Question 29

Chlorine is toxic. Why is it not dangerous to add it to drinking water?

Answer 29

It is added in very low concentrations

Question 30

What is produced when chlorine is added to water?

Answer 30

HClO and HCl

Question 31

What is produced when chlorine is added to sodium hydroxide (NaOH)?

Answer 31

NaClO and NaCl and Water

Question 32

# State the observation for the reaction Cl2(aq) + 2NaBr(aq) --> Br2(aq) + 2NaCl(aq)

Answer 32

Orange/Brown solution (Br2 is formed)

Question 33

# State the observation for the reaction Cl2(aq) + 2NaI(aq) --> I2(aq) + 2NaCl(aq)

Answer 33

Brown solution (I2 is formed)

Question 34

# State the observation for the reaction I2(aq) + 2NaCl(aq) -->

Answer 34

No reaction (brown solution remains)

Question 35

# Give the products of the reaction Cl2(aq) + 2NaBr(aq) -->

Answer 35

Br2(aq) + 2NaCl(aq)

Question 36

# Give the products of the reaction Cl2(aq) + 2NaI(aq) -->

Answer 36

I2(aq) + 2NaCl(aq)

Question 37

# Give the products of the reaction Br2(aq) + 2NaI(aq) -->

Answer 37

I2(aq) + 2NaBr(aq)

Question 38

# Give the products of the reaction Br2(aq) + 2NaCl(aq) -->

Answer 38

Br2(aq) + 2NaCl(aq) No reaction

Question 39

What is a REDOX reaction?

Answer 39

A reaction when one reactant is oxidised and another is reduced

Question 40

What is oxidation?

Answer 40

Loss of electrons

Question 41

What is reduction?

Answer 41

Gain of electrons