@An example of oxidation includes:
The rusting of iron
Heating Ammonium chloride
Dissolving Calcium carbonate in water

@Which substance is used for pickling onions?
Ethanoic acid
Hydrochloric acid
Ethane

@A gas which pollutes the atmosphere is:
SO
CO
Ar

@What volume of liquid is in the measuring cylinder?
#cylin2
8 cm
6 cm
9 cm

@Why are the components in crude oil separated by fractional distillation?
Because they have different boiling points
Because they are all liquid
Because they are hydrocarbons

@AlCl + ?NaOH  Al(OH) + 3NaC What is the missing number needed to balance the equation?
3
1
2

@Washing soda crystals are made of:
Sodium carbonate
Magnesium sulphate
Magnesium chloride

@The electrode labelled 'Y' is connected to the negative terminal of a battery. This electrode is called:
#electro1
the cathode
the anode
an electrolyte

@When chemical bonds are formed:
Energy is released
Energy is taken in
Energy remains unchanged

@An element that forms crystals composed of small molecules is:
Iodine
Diamond
Magnesium

@A substance, made of one kind of atom, is:
an element
a compound
a mixture

@Diffusion is when:
Particles of different substances gradually become mixed
Molecules come apart
A substance goes straight from a solid to a gas

@Which statement is INCORRECT for protons?
Protons orbit the nucleus
Protons are similar in mass to neutrons
Protons carry a positive charge

@Approximately how much iron is present in stainless steel?
74%
10%
<1%

@Sodium is a metal. Just using this information only, which of the following could be stated as a fact?
It conducts electricity
It is hard
It has a very high melting point

@Caesium is an alkaki metal in group 1. When placed in water it will produce:
Caesium hydroxide and hydrogen
Caesium oxide and hydrogen
Caesium oxide and oxygen

@In carbon dioxide, then main types of bond are:
Covalent
Ionic
Van der Waals

@The substance used to kill bacteria in tap water is:
Chlorine
Ammonia
Bromine

@If a lighted splint is put into a test tube containing hydrogen then it will:
Make a popping sound
Burn more brightly
Make the splint go out

@Approximately how much of the air is composed of nitrogen?
78%
21%
99%

@How many oxides have a neutral pH?
A few
None at all
A very large number of them

@Which one of the following is sulphur not used for
Making natural rubber 'softer' for tyres
Making insecticides
Making matches

@Natural gas, used in the home in fires and cookers, is mainly:
Methane
Butane
Propene

@The halogens are elements all found in which group of the periodic table?
Seven
One
Two

@In the contact process, SO and O are reacted together to form SO. This process is sped up by using:
Vanadium pentoxide as a catalyst
Very high temperatures
Air rather than pure oxygen

@Which one of the following changes is oxidation?
CuO  CuO
N  NH
FeCl  FeCl

@If a fossil fuel burns with a yellow sooty flame then:
there is not enough oxygen present
there is too much oxygen
there is just the correct amount of oxygen

@What volume of water is in the measuring cylinder?
#cylin1
45.0 cm
40.5 cm
55.0 cm

@If a solid will dissolve in a liquid, the liquid is called a:
Solvent
Solute
Solution