@What is the best way to separate iodine from other impurities?
Sublimation
Dissolving and filtering
Fractional distillation

@The relative molecular mass of ammonium chloride NHCl?
53.5
50.5
60.0

@An acid will always:
React with an alkali to form a salt and  water
React with any metal to produce hydrogen
Fume in moist air

@A Hoffmann voltameter is connected as shown. The name of the negative (-) electrode is:
#hoff
The cathode
The anode
An ion

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

@Which one of the following is the most likely melting point of an ionic solid?
950
0
-57

@Air, water, hydrogen, brass, silver nitrate & tin. From the list below, how many substances are elements?
Two
One
Four

@In a solid, if you supply more energy then:
the more the particles vibrate
the particles melt
the bonds between the particles break straight away

@Which of the following is incorrect for neutrons?
They are similar in mass to electrons
They carry no charge
They do not orbit the nucleus

@What is the name of the reducing agent used to obtain iron from its ore in a blast furnace?
Carbon monoxide
Calcium carbonate
Hydrogen

@Why are metals good conductors of electricity?
They have many free moving electrons
They have high melting points
They are made of electrons only

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

@Which one of the following is NOT a property of diamond?
Low melting point
Transparent
Does not conduct electricity

@Which of the following is a chemical symbol for a halogen?
I
He
Na

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

@When hydrogen chloride gas mixes with ammonia gas:
White fumes are formed
There is an explosive reaction
A dense black vapour is formed

@Air is passed through sodium hydroxide solution, and then over heated copper. The gases removed during this process are:
Carbon dioxide and oxygen
Oxygen and water vapour
Nitrogen and carbon dioxide

@Sulphuric acid is made by the:
Contact process
Frasch process
Electrolysis

@What is the name of this substance?
#eth
Ethane
Methanol
Ethene

@Elements in Group II are called:
Alkaline earth metals
Alkali metals
Halogens

@If you had one 10g lump of a substance, and ten 1g lumps of the same substance then:
The ten 1g lumps would react faster
The one 10g lump would react faster
There would be no difference in the reaction rates

@Copper II oxide reacts with hydrogen to form copper and water. The copper II oxide is:
Reduced
Oxidised
Neutralised

@Farmers must be very careful when adding nitrates (in fertilizers) to their land because:
Nitrates are soluble and could contaminate water supplies eventually
Lime in the soil reacts with the nitrates
The soil can quickly become too acidic for crops to grow

@Carbon monoxide is poisonous because it:
Combines with the oxygen carrying portions of blood
Is oxidised in the lung
Produces carbon in the lungs

@If you were asked to measure 21.7 cm of liquid as accurately as posible, which one would you use?
50cm burette
100cm beaker
25cm pipette

@To separate large pieces of glass from water, what  technique would be best?
Decanting
Dissolving, filtering and evaporation
Sublimation

@?HO  2HO + O The number needed to balance the equation is:              
2
1
4

@The diagram shows part of a pH chart. Where abouts would lemmon juice go?
#phscale
Position n
Position j
Position k

@The diagram shows a Hoffmann voltameter, connected to a power supply. The blue liquid is water, with a little sulphuric acid in it. The gas X is:
#hoff
Oxygen
Hydrogen
Sulphur dioxide