Question 1

what is a pure substance?

Accepted Answer

one that is made up of just one substance (can be an element/compound)

Answer

one that is made up of many substances

Question 2

how to tell whether a substance is pure or not

Accepted Answer

a pure substance has a fixed melting and boiling point

Answer

a pure substance has a range of melting and boiling points

Question 3

what is a formulation?

Accepted Answer

a mixture that has been designed to be a useful product e.g. medicine, paint

Answer

a compound that has been designed to be a useful product e.g. medicine, paint

Question 4

what do cleaning agents contain?

Accepted Answer

surfactant (actual detergent that removes grease), water (to thin out mixture so it can squirt more easily from the bottle), colouring and fragrance additives (to improve appeal of product to customers) and rinse agent (to help water drain off crockery)

Answer

binder (for colour), pigment (to help paint attach to object and form a protective film when dry) and solvent (to help pigment and binder spread well during paint by thinning them out)

Answer

pigment (for colour), binder (to help paint attach to object and form a protective film when dry) and solvent (to help pigment and binder spread well during paint by thinning them out)

Question 5

what do paints contain?

Accepted Answer

pigment (for colour), binder (to help paint attach to object and form a protective film when dry) and solvent (to help pigment and binder spread well during paint by thinning them out)

Answer

surfactant (actual detergent that removes grease), water (to thin out mixture so it can squirt more easily from the bottle), colouring and fragrance additives (to improve appeal of product to customers) and rinse agent (to help water drain off crockery)

Answer

binder (for colour), pigment (to help paint attach to object and form a protective film when dry) and solvent (to help pigment and binder spread well during paint by thinning them out)

Question 6

what is the mobile phase in chromatography?

Accepted Answer

the solvent

Answer

the chromatography paper

Question 7

what is the stationary phase in chromatography?

Accepted Answer

the chromatography paper

Answer

the solvent

Question 8

how to calculate Rf?

Accepted Answer

distance moved by substance / distance moved by solvent

Answer

distance moved by solvent / distance moved by substance

Question 9

test for chlorine

Accepted Answer

damp blue litmus paper is bleached white

Answer

limewater turns cloudy

Answer

glowing splint relights

Answer

lit splint goes out with a squeaky pop

Question 10

test for hydrogen

Accepted Answer

lit splint goes out with a squeaky pop

Answer

glowing splint relights

Answer

limewater turns cloudy

Question 11

test for oxygen

Accepted Answer

glowing splint relights

Answer

lit splint goes out with a squeaky pop

Answer

limewater turns cloudy

Question 12

test for carbon dioxide

Accepted Answer

limewater turns cloudy

Answer

glowing splint relights

Answer

damp blue litmus paper is bleached white

Answer

lit splint goes out with a squeaky pop

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