Daily Practice · GCSE Science
January 2000 - GCSE Science 5-a-day
Every GCSE Science sheet published in January 2000, with answers. Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
Every sheet in January 2000
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st January 2000A student reacts 2.4 g of magnesium with excess dilute hydrochloric acid: Mg + 2HCl -> MgCl2 + H2. Relative atomic mass of Mg = 24. Calculate the number of moles of hydrogen gas produced.
- 2nd January 2000State whether breaking a chemical bond requires energy or releases energy.
- 3rd January 2000Name the alkene with the molecular formula C4H8.
- 4th January 2000Name the two gases released in large amounts by volcanic activity that formed most of the Earth's early atmosphere.
- 5th January 2000Name the energy store associated with a moving car.
- 6th January 2000Why does the national grid transmit electricity at a very high potential difference?
- 7th January 2000Why is the atomic model a good example of how scientific models change?
- 8th January 2000A spanner is used to loosen a bolt. Explain why using a longer spanner makes it easier to loosen the bolt.
- 9th January 2000State 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.
- 10th January 2000Define the independent variable.
- 11th January 2000State the type of large biological molecule that all enzymes are made from.
- 12th January 2000Name the type of pathogen that causes malaria.
- 13th January 2000Name the hormone released when blood glucose concentration is too high, and state its overall effect.
- 14th January 2000Define mutation.
- 15th January 2000A sample contains 90% of an isotope with mass number 10 and 10% of an isotope with mass number 11. Calculate the relative atomic mass, to 1 decimal place.
- 16th January 2000Why are the noble gases unreactive?
- 17th January 2000How many atoms are there in 0.5 mol of helium?
- 18th January 2000Using the values in the previous question, calculate the overall energy change for the reaction.
- 19th January 2000The forward reaction of a particular reversible reaction is exothermic. State whether the reverse reaction is exothermic or endothermic.
- 20th January 2000Describe the test, and the positive result, for ammonium ions.
- 21st January 2000Convert 3.5 kJ into joules.
- 22nd January 2000A resistor of resistance 15 ohm is connected to a 6.0 V supply. Calculate the current flowing through it. Use V = I x R.
- 23rd January 2000How is the temperature of a gas related to the motion of its molecules?
- 24th January 2000State what the gradient of a distance-time graph represents.
- 25th January 2000Explain why ultraviolet, X-rays and gamma rays can be hazardous to human health, but radio waves are not.
- 26th January 2000Explain, in terms of forces, why a satellite in a stable orbit does not fall towards the Earth or fly off into space.
- 27th January 2000How many pairs of chromosomes are there in a human body cell?
- 28th January 2000Where are most stomata found on a typical leaf, and why?
- 29th January 2000Name four limiting factors of photosynthesis.
- 30th January 2000In pea plants, the allele for tall stems (T) is dominant over the allele for short stems (t). A homozygous tall plant (TT) is crossed with a homozygous short plant (tt). State the genotype and phenotype of all the offspring.
- 31st January 2000State what is meant by the term biodiversity.