Daily Practice · GCSE Science
August 1985 5-a-day
Every sheet in August 1985
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st August 1985Why is an atom electrically neutral?
- 2nd August 1985State the law of conservation of mass.
- 3rd August 1985State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
- 4th August 1985Explain how a catalyst increases the rate of a reaction without being used up.
- 5th August 1985Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 6th August 1985Explain why carbon monoxide is dangerous even though it has no smell.
- 7th August 1985Why can no device be 100 percent efficient?
- 8th August 1985Why is melting described as a physical change?
- 9th August 1985A resultant force of 45 N acts on an object of mass 9.0 kg. Calculate its acceleration. Use F = m x a.
- 10th August 1985Give one everyday example of a transverse wave and one everyday example of a longitudinal wave.
- 11th August 1985State what happens to the orbital speed needed for a stable orbit as the orbital radius increases.
- 12th August 1985Convert 0.05 mm into micrometres.
- 13th August 1985State the function of the valves in the heart and in veins.
- 14th August 1985State three factors that can limit the rate of photosynthesis.
- 15th August 1985Explain why type 1 diabetes is treated with insulin injections rather than tablets.
- 16th August 1985The Arctic fox has small, rounded ears compared with the desert fennec fox, which has very large ears. State whether this is a structural, behavioural or functional adaptation, and explain how it helps the Arctic fox survive.
- 17th August 1985Explain, in terms of particle size, how reverse osmosis separates water from dissolved salt.
- 18th August 1985Write the formula of calcium chloride and explain the ratio.
- 19th August 1985Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
- 20th August 1985Hydrogen reacts with chlorine to form hydrogen chloride: H2 + Cl2 -> 2HCl. Use the bond energies given to calculate the overall energy change for this reaction. Bond energies: H-H = 436 kJ/mol, Cl-Cl = 243 kJ/mol, H-Cl = 432 kJ/mol.
- 21st August 1985Name the alkene with the molecular formula C4H8.
- 22nd August 1985Name three greenhouse gases.
- 23rd August 1985A kettle transfers 360000 J of energy in 150 s. Calculate its power in watts.
- 24th August 1985Give the equation linking energy transferred, charge flow and potential difference.
- 25th August 1985Who provided the evidence for the existence of the neutron, and roughly when relative to the nuclear model?
- 26th August 1985A spanner is used to loosen a bolt. Explain why using a longer spanner makes it easier to loosen the bolt.
- 27th August 1985State two ways of increasing the force produced by a motor effect setup, for a wire of fixed length at a fixed angle to the field.
- 28th August 1985Why does taking repeat readings and calculating a mean improve the data?
- 29th August 1985Name the plant tissue that transports water and dissolved minerals from the roots to the leaves.
- 30th August 1985State two ways measles is prevented from spreading.
- 31st August 1985Name the hormone released when blood glucose concentration is too high, and state its overall effect.