Things To Know

Question 1

What charge is Pb

Answer 1

2+

Question 2

In PV = nRT what is P measured in

Answer 2

kPa

Question 3

What colour is Iodine dissolved in water

Answer 3

Brown

Question 4

What colour is Iodine dissolved in organic solvents (hexane)

Answer 4

Purple

Question 5

What colour is Iodide in solution

Answer 5

Colourless

Question 6

Test for iodine in solution

Answer 6

Add starch - will turn blue black

Question 7

Test for iodide in solution

Answer 7

Silver nitrate

Question 8

Group 2 (2X) + O₂

Answer 8

forms 2XO (metal oxide)

Question 9

Group 2 + Water
X + 2H₂O

Answer 9

X(OH)₂ + H₂ (metal hydroxide and hydrogen)

Question 10

Thermal stability of group 2 carbonates increase

Answer 10

Down the group

Question 11

Group 2 hydroxides solubility

Answer 11

More soluble down the group

Question 12

Group 2 chlorides solubility

Answer 12

Less soluble down the group

Question 13

Group 1 + Water
2X + 2H₂O

Answer 13

2XOH + H₂ (Metal hydroxide and hydrogen)

Question 14

4Li + O₂ →

Answer 14

2Li₂O

Question 15

Enthalpy change of neutralisation is per mol of

Answer 15

water

Question 16

Enthalpy change of formation is per mol of

Answer 16

product

Question 17

What is the enthalpy of combustion always

Answer 17

negative

Question 18

Octane rating

Answer 18

Higher it is, the less knocking in the engine

Question 19

What is the halogen test with cyclohexane

Answer 19

Add halogen (e.g Br2) to water and cyclohexane. Shake until two layers form. The non polar halogen will dissolve in the non polar cyclohexane.

Question 20

Cl2 in cyclohexane

Answer 20

Pale green

Question 21

Br2 in cyclohexane

Answer 21

bright Orange

Question 22

I2 in cyclohexane

Answer 22

Purple