@The graph labelled x shows the amount of product produced during a chemical reaction. Which of the other graphs shows the same experiment, but this time using a catalyst?
#rrate_1
Graph z
Graph y
Graph w
@Which one of the following changes is oxidation?
CuÛO ï CuO
NÛ ï NHÜ
FeClÜ ï FeClÛ
@Which metal is used in the production of compact discs (CD's)?
Aluminium
Steel
Chromium
@What are fossil fuels?
Fuels that are formed from things that were once alive
Fuels that are formed only from ancient rocks
Fuels formed from plant material only
@The substance most likely to be found in this thermometer is:
#thermom1
Mercury
Silver
Water
@Oxygen and nitrogen can be separated from the air by fractional distillation because:
Nitrogen has a different boiling point from oxygen
Oxygen is more reactive than nitrogen
Oxygen is more soluble than nitrogen
@What is the relative molecular mass of water (HÛO)?
18
16
20
@Acid (in burette X) is slowly added to an alkali (in flask Y) until it is just neutralised. At this point you have reached:
#bur1
"The end point"
"A neutral reaction"
"Equilibrium"
@What is the name of the scientist connected with much of the early work on electrochemistry?
Michael Faraday
Charles Darwin
Joseph Priestley
@In an exothermic reaction a temperature rise is produced because:
More energy is released when new bonds are formed than when old ones break
Less energy is released when new bonds are formed than when old ones break
The products are less stable because they have lost energy
@Which one of the following does not contain ionic bonds?
NÛ
NaCl
AlÛClÜ
@In a gas, the particles are:
Not attracted to each other at all
Strongly attracted to each other
Bonded to each other
@The mass number for an atom is the number of:
Protons & neutrons added together
Protons only
Neutrons only
@Aluminium is made by using a mixture of bauxite and cryolite. The aluminium is obtained by:
Electrolysing the molten mixture
Fractional distillation of the mixture
Decomposing the bauxite, the cryolite being a catalyst
@The type of bonding in metals is called:
Metallic bonding
Ionic bonding
Hydrogen bonding
@In which of the following pairs can both metals be obtained by passing carbon monoxide over the hot metal oxide?
Lead and copper
Aluminium and iron
Copper and magnesium
@Which one of the following is a property of graphite?
Conducts electricity
Fairly hard substance
Transparent
@What will displace bromine from sodium bromide solution?
Chlorine gas
Aqueous iodine
Aqueous potassium iodide
@The diagram shows an experiment set up to test the diffusion of hydrogen. If the apparatus is left for some time:
#diff
The level in tube x goes down and the level in tube y up
The two levels in x and y stay the same
The level in tube y goes down and the level in x goes up
@Nitrogen is quite often used in the welding and glass making industries. This is because it:
Provides a safe non-reactive atmosphere
Means higher temperatures can be reached
Speeds up the reaction rates
@Oxides of non metals are usually:
Acidic
Alkaline
Neutral
@For the gas sulphur dioxide, which of the following is incorrect?
It is insoluble in water
It turns moist universal indicator paper red
It is heavier than air
@The molecular formula of Octane is:
CáHÚá
CáHá
CáHÚß
@An element does not conduct electricity. Using this information only, the element is likely to belong in:
Group 7 (the halogens)
Group 1 (the alkali metals)
The transition elements
@Magnesium in tube Y is reacting more slowly than in tube X. To speed up tube Y you could:
#ttube
Heat test tube Y a little
Shake tube Y
Add more acid (blue liquid)
@When metal ions are discharged at the cathode during electrolysys the process is called:
Reduction
Oxidation
Hydration
@Before river water can be used in the home it is purified by:
filtration and chlorination
distillation and neutralisation
neutralisation and filtration
@Various nitrogen oxides are produced by fossil fuel power stations. These gases produce what kind of acid rain?
Nitric Acid
Sulphuric Acid
Ethanoic Acid
@What is a 'pure' substance?
Something that is made of just a single substance
A substance that contains no germs
A substance with a melting point that covers several degrees
