@Molten potassium iodide has a current passed through it. What gas is produced?
#molten
Iodine
Potassium
Postassim Iodide

@To break chemical bonds you:
Give heat energy
Remove heat energy
Do not add or remove heat energy

@Which one of the following does not contain ionic bonds?
N
NaCl
AlCl

@What is the chemical symbol for silver?
Ag
S
Sr

@Which of the following is incorrect for electrons?
They carry a smaller negative charge than protons positive charge
They can be removed from the atom altogether
In a neutral atom there are as many as many protons

@A substance not used in the production of iron is:
Sulphur
Hot air
Coke

@Aircraft frameworks are usually made of:
Aluminium
Zinc
Tungsten

@What two substances are necessary for rusting to occur?
Air and water
Water and an oxide
Oxygen and nitrogen

@The temperature diamond melts at is:
3550
95
300

@Why is chlorine added to water in swimming pools?
Disinfect the water
As a bleaching agent
To soften the water

@Hydrogen gas enters at the left, and is burning on the right. What can be seen on the cold surface?
#burn
Water droplets
Soot
Yellowish deposit

@Nitrogen is used to make Ammonia. The process is called the:
Haber process
Frasch process
Contact process

@Roughly how much of the Earth's crust is made by oxygen (in various compounds)?
47%
5%
21%

@What happens to sulphur when it is heated with a blue bunsen flame?
It changes colour
It sublimes
It's immediately converted to sulphur dioxide

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

@Which of the following sets contains three elements from the same group of the periodic table?
Li, Na and K
Na, Mg and Al
N, S and Br

@The reaction between powdered magnesium and dilute sulphuric acid can be sped up by:
Warming the mixture
Adding water
Using acid that is more dilute

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

@What is the name of the liquid found between the plates of a car battery?
Sulphuric acid
Nitric acid
Sodium carbonate

@When burnt, which one of the following does NOT produce pollution?
Hydrogen
Diesel oil
Wood

@This thermometer reads 0.1C too low. The correct temperature reading is:
#thermom1
43.9
43.8
43.7

@The diagram shows the reuslts of a chromotography experiment. The sample S does NOT contain:
#chrom
Samples W and Z
Samples X and Y
Samples W and Y

@What is the mass of each element present in one mole of calcium chloride (CaCl)
Calcium, 40g and Chlorine, 71g
Calcium, 20g and Chlorine, 35.5g
Calcium, 80g and Chlorine, 35.5g

@Dilute sulphuric acid reacts with:
Zinc oxide to produce Zinc sulphate and water
Copper to produce hydrogen
Sodium carbonate to produce oxygen

@The liquid in the water allows electricity to flow through it when X and Y are connected to a battery. The liquid is:
#electro1
an Electrolyte
a Conductor
a Cathode

@An exothermic reaction is:
One that produces heat energy
One that absorbs heat energy
One where there is no heat energy change

@Which statement about covalent bonds is true?
They are as strong as ionic bonds
They are present in some metals
They are the weakest type of bonds found

@The elements in copper carbonate are:
Oxygen, copper and carbon
Copper and carbon
Copper, carbon, nitrogen and oxygen

@During the production of iron from iron ore, which one of the following is NOT used in the blast furnace?
Slag
Limestone
Coke
