1 Exp Chem (P/C)

Question 1

SI unit for temperature

Answer 1

Kelvin

Question 2

Burette can measure volume to the nearest __

Answer 2

0.05 cm cube

Question 3

what apparatus to measure mass

Answer 3

beam balance / electronic balance

Question 4

what volume can pipette measure

Answer 4

fixed volume of 10.0 or 25.0 cm cube

Question 5

gases suitable for downward delivery of gas collection

Answer 5

soluble dense gases such as hydrogen chloride, chlorine and sulfur dioxide

Question 6

method of collecting gases such as oxygen, nitrogen and carbon dioxide

Answer 6

displacement of water

Question 7

gases suitable for upward delivery of gas collection

Answer 7

soluble lower dense gases such as ammonia

Question 8

what apparatus can be used to measure the volume of gas

Answer 8

graduated gas syringe

Question 9

(P) what drying agent to use for drying of most gases except for ammonia

Answer 9

concentrated sulfuric acid

Question 10

(P) drying agent to dry ammonia

Answer 10

quicklime (Calcium oxide)

Question 11

how to separate insoluble solids from liquid

Answer 11

filtration

Question 12

how to obtain soluble salts from its solution

Answer 12

crystallisation, follow by filtration

Question 13

simple distillation is to separate ___ from its ___

Answer 13

solvent ; solution

Question 14

(P) what substances can be obtained from sublimation

Answer 14

ammonium chloride, iodine

Question 15

how to test if a substance is pure or impure

Answer 15

pure > fixed MP and BP.
impure > melts and boils over a range of temperature

Question 16

(P) how to separate immiscible liquids

Answer 16

separating funnel

Question 17

which substance in a liquid mixture will be separated first using fractional distillation

Answer 17

the lower boiling point liquid from the liquid mixture

Question 18

paper chromatography can be used to separate a mixture of substances which have ___

Answer 18

different solubilities

Question 19

the substances that travelled further is the more/less soluble substance

Answer 19

more soluble

Question 20

(P) Rf value is known as the

Answer 20

retention factor

Question 21

(P) colourless substance in the chromatogram can be identified by ___

Answer 21

spraying locating agent