Daily Practice · GCSE Science
April 1968 5-a-day
Every sheet in April 1968
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1968Explain why potable water is not the same as pure water.
- 2nd April 1968Explain why sodium chloride conducts electricity when molten but not when solid.
- 3rd April 1968Give the formula for atom economy.
- 4th April 1968Explain, in terms of the reaction pathway, why adding a catalyst increases the rate of a reaction without changing the overall energy change of the reaction.
- 5th April 1968Balance the equation for the complete combustion of methane: CH4 + O2 -> CO2 + H2O
- 6th April 1968State one advantage of running known reference substances alongside an unknown sample on the same chromatogram, rather than only comparing to published Rf values.
- 7th April 1968How is the uncertainty in a set of repeated readings usually estimated?
- 8th April 1968Define electric current.
- 9th April 1968A source has a half-life of 5 days and an initial activity of 1600 Bq. What is its activity after 15 days?
- 10th April 1968State two factors that increase a driver's thinking distance.
- 11th April 1968Name a typical material used to make a permanent magnet, and a typical material used to make an induced (temporary) magnet.
- 12th April 1968State, in one sentence, what the Big Bang model proposes about the early universe.
- 13th April 1968Calculate the surface area to volume ratio of a cube of side 2 cm.
- 14th April 1968Explain why a small number of healthy volunteers are given a very low dose of a new drug in the first stage of a clinical trial.
- 15th April 1968A yeast culture respires without oxygen. Name the two products of this reaction, and name one industrial process that relies on it.
- 16th April 1968A man who is a known carrier of cystic fibrosis (Ff) has children with a woman who has been confirmed to carry no cystic fibrosis allele at all (FF). Explain why none of their children can have cystic fibrosis.
- 17th April 1968Give the resolution of a burette that can be read to the nearest half of a small division.
- 18th April 1968Why is an atom electrically neutral?
- 19th April 1968State the law of conservation of mass.
- 20th April 1968Concentrated sodium chloride solution (brine) is electrolysed using inert electrodes. State the products formed at the cathode and at the anode.
- 21st April 1968Explain why increasing temperature increases the rate of a reaction, referring to both the frequency and the energy of collisions.
- 22nd April 1968Give one piece of evidence that a solid sample is impure, based on its melting behaviour.
- 23rd April 1968Explain why carbon monoxide is dangerous even though it has no smell.
- 24th April 1968Why can no device be 100 percent efficient?
- 25th April 1968Why is melting described as a physical change?
- 26th April 1968A cyclist rides 300 m north then 300 m back south to the start. State the total distance travelled and total displacement.
- 27th April 1968Sound waves travel through a steel rail at approximately 5900 m/s. A sound wave sent along the rail has a frequency of 2950 Hz. Calculate its wavelength.
- 28th April 1968State the eventual fate of a star with a much greater mass than the Sun, after it explodes as a supernova.
- 29th April 1968Convert 0.05 mm into micrometres.
- 30th April 1968State the function of the valves in the heart and in veins.