2 h) Chemical Tests

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Anhydrous

Back (Answer)

Without water

Front (Question)

Anion

Back (Answer)

Negative ion

Front (Question)

Cation

Back (Answer)

Positive ion

Front (Question)

Ion

Back (Answer)

Charged particle formed when an atom (or group of atoms) loses or gains electrons.

Front (Question)

Melting point

Back (Answer)

Temperature at which a substance changes state from a solid to a liquid. Pure substances have fixed melting points but a mixture may melt over a range of temperatures.

Front (Question)

Precipitate

Back (Answer)

Solid that is formed by a reaction involving liquids or gases.

Front (Question)

Test for halides and results

Back (Answer)

Add dilute nitric acid, add silver nitrate solution. Chlorides = white precipitate Bromide = cream precipitate Iodide = yellow precipitate

Front (Question)

Flame test method

Back (Answer)

Dip wire loop into conc. hydrochloric acid, burn in flame until no colour is seen, dip into conc. hydrochloric acid and then into solid sample or dip into solution of sample.

Front (Question)

Flame colour for lithium ions

Back (Answer)

red

#10

Front (Question)

Flame colour for sodium ions

Back (Answer)

yellow

#11

Front (Question)

Flame colour for potassium ions

Back (Answer)

lilac

#12

Front (Question)

Flame colour for calcium ions

Back (Answer)

orange-red (brick red)

#13

Front (Question)

Flame colour for copper ions

Back (Answer)

blue-green

#14

Front (Question)

Test for ammonium ion and result

Back (Answer)

Add sodium hydroxide solution, warm gently. Damp red litmus paper turns blue. Pungent smell.

#15

Front (Question)

Test for cations using sodium hydroxide and results

Back (Answer)

Add sodium hydroxide solution. copper(II) ions = blue precipitate iron(II) ions = dirty green precipitate iron(III) ions = orange/brown precipitate

#16

Front (Question)

Test for sulphate ion and result

Back (Answer)

Add dilute hydrochloric acid, add barium chloride solution. White precipitate forms.

#17

Front (Question)

Test for carbonate ion and result

Back (Answer)

Add dilute hydrochloric acid, bubble gas produced through limewater. Limewater turns cloudy.

#18

Front (Question)

Test for oxygen gas

Back (Answer)

Glowing splint re-lights

#19

Front (Question)

Test for hydrogen gas

Back (Answer)

Use a lit splint. Burns with a squeaky pop.

#20

Front (Question)

Test for carbon dioxide gas

Back (Answer)

Bubble through limewater. Limewater turns cloudy.

#21

Front (Question)

Test for ammonia gas

Back (Answer)

Damp red litmus paper turns blue. Pungent smell. (alternative: add hydrogen chloride gas and a white precipitate forms)

#22

Front (Question)

Test for chlorine gas

Back (Answer)

Damp litmus paper is bleached. (chlorine is a green gas)

#23

Front (Question)

Test for the presence of water

Back (Answer)

Anhydrous copper(II) sulphate turns from white to blue.

#24

Front (Question)

Test for the purity of water

Back (Answer)

Boils at 100 degrees C Melts at 0 degrees C