Chemical Test IGCSE Chemistry (Double Award)

What is the test for oxygen?

Glowing splint relights

What is the test for hydrogen?

Lighted splint burns with squeaky pop

What is the test for chlorine?

Damp blue litmus paper red then bleaches

What is the test for ammonia?

Damp red litmus paper turns blue

What is the test for carbon dioxide?

Bubble through limewater turns cloudy

What is the chemical test for water?

Water will turn anhydrous copper (II) sulfate from white to blue

What is the physical test for water?

Pure water boils at exactly 100 degrees

What is the halide test for anions?

Nitric acid, add silver nitrate produces a coloured precipitate

In the halide test for anions, what colour precipitate does Chloride produce?

White

In the halide test for anions, what colour precipitate does bromide produce?

Cream

In the halide test for anions, what colour precipitate does iodide produce?

Yellow

What is the Sulfate test for anions?

Hydrochloric acid add barium chloride. White precipitate of barium sulfate

What is the carbonate test for anions?

Hydrochloric acid test bubbles for carbon dioxide

What are the group 1 & 2 tests for cations?

Flame test

In the flame test, what colour does the Lithim ion burn as?

Red

In the flame test, what colour does the sodium ion burn as?

Yellow

In the flame test, what colour does the potassium ion burn as?

Lilac

In the flame test, what colour does the calcium ion burn as?

Brick Red

How do you test for cations in the transition metals?

Add sodium hydroxide solution

When sodium hydroxide solution is added to an unknown transition metal and it turns blue, what metal is it?

Copper (II) ion

When sodium hydroxide solution is added to an unknown transition metal and it turns green, which metal is it?

Iron (II) ion

When sodium hydroxide solution is added to an unknown transition metal and it turns brown, which metal is it?

Iron (III) ion

When ammonium is tested for cations, what do you do?

Add sodium hydroxide solution and test gas for ammonia

How do you perform the flame test?

Nichrome wire, roaring flame, hydrochloric acid, roaring flame, dip into sample, roaring flame, flame colour

What element colour is fluorine?

Yellow

What element colour is Chlorine?

Green

What element colour is bromine?

brown

What element colour is Iodine?

Dark grey

What element colour is astatine?

Black

What colour in solution is chlorine?

Pale green

What colour in solution is bromine?

orange

What colour in solution is iodine?

Brown

How do you prepare oxygen?

Hydrogen peroxide decomposed using manganese oxide, displacement of water

How do you prepare hydrogen?

Dilute hydrochloric acid, add zinc, displacement of water

How do you prepare carbon dioxide?

Dilute hydrochloric acid, add calcium carbonate, displacement of water

When hydrogen chloride and ammonia are diffusing towards each other in a sealed tube, what is formed? Where?

Ammonium chloride, where they meet

What is the order of the reactivity series?

Potassium, Sodium, Lithium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Hydrogen, Copper, Silver, Gold,

What is the chemical name for rust?

Hydrated iron (III) oxide

What does sacrifical protection involve?

Blocks of zinc, zinc corrodes instead of iron

What does galvanising involve?

Completely coated in zinc, protects from oxygen and water accessing iron

What is the positive electrode called?

Anode

What is the negative electrode called?

Cathode

What is the positive ion called?

cation

What is the negative ion called?

anion

What is Aluminium ore known as?

Alumina

What solvent is used in the extraction of aluminium?

Cryolite

In increasing order of temperature, what order are the fractions in?

Refinery gases, gasoline, kerosene, diesel, fuel oil, bitumen

What is the general formula for Alkanes?

CnH2n+2

What is the general formula for Alkenes?

CnH2n

What products are formed when a acid and metal react together?

Salt and hydrogen

What products are formed when an acid and base react together?

Salt and water

What products are formed when an acid and metal carbonate react together?

Salt, water and carbon dioxide

What products are formed when an acid and an alkali react together?

Salt and water