Calculations Involoving Masses

Question 1

Avogadro’s number

Answer 1

6.02 x 10 ^23

Question 2

Deduce the empirical formula of propene (C3H6)

Answer 2

CH2

Question 3

Calculate the formula for Calcium chloride

Answer 3

Ca2+ Cl- = CaCl2

Question 4

Nitrate Ion

Answer 4

-
NO
3

Question 5

Sulphate ion

Answer 5

2-
SO
4

Question 6

Ammonium ion

Answer 6

+
NH
4

Question 7

Carbonate ION

Answer 7

2-
CO
3

Question 8

Hydroxide ION

Answer 8

-

OH

Question 9

Sulphuric acid eq.

Answer 9

H SO

2 4

Question 10

Nitric Acid Eq.

Answer 10

HNO

3

Question 11

Hydrochloric acid eq.

Answer 11

HCL

Question 12

Phosphoric acid eq.

Answer 12

H PO

3 4

Question 13

What do you do to test for CO2

Answer 13

Pass gas through limewater, it it goes cloudy CO2 is present

Question 14

How do you test for O2

Answer 14

Put a glowing splint in gas and if it relights oxygen is present

Question 15

How do you test for H2 (hydrogen)

Answer 15

Put a lit splint in gas and if it POPS hydrogen is present

Question 16

How do you test for NH3 (ammonia)

Answer 16

Pass gas over damp red litmus paper, if it goes blue ammonia is present

Question 17

How do you test for chlorine ( CL2)

Answer 17

Pass gas over damp blue litmus paper and if chlorine is present it’ll go red then white

Question 18

What’s the order of fractional distillation

Answer 18

GAS
PETROL
KEROSENE
DIESEL
FUEL OIL
BITUMEN