Daily Practice · GCSE Science
December 1980 5-a-day
Every sheet in December 1980
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 1980State the pH value of a neutral solution.
- 2nd December 1980Hydrogen 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.
- 3rd December 1980State the number of covalent bonds a carbon atom forms in a saturated hydrocarbon.
- 4th December 1980Explain, in terms of infrared radiation, how greenhouse gases keep the Earth warm.
- 5th December 1980A motor is supplied with 800 J of energy and wastes 240 J as heat. Calculate its efficiency as a percentage.
- 6th December 1980Give the equation linking energy transferred, charge flow and potential difference.
- 7th December 1980Who provided the evidence for the existence of the neutron, and roughly when relative to the nuclear model?
- 8th December 1980State the equation that links pressure, force and area.
- 9th December 1980In a simple d.c. electric motor, state the name and function of the component that reverses the current in the coil every half turn.
- 10th December 1980Why does taking repeat readings and calculating a mean improve the data?
- 11th December 1980An amylase reaction is complete after 200 seconds. Calculate the rate of reaction using rate = 1000 / time.
- 12th December 1980State two ways measles is prevented from spreading.
- 13th December 1980Name the gland that monitors and controls blood glucose concentration.
- 14th December 1980Explain why genetic engineering can introduce a new characteristic in a single generation, while selective breeding cannot.
- 15th December 1980An atom has atomic number 11 and mass number 23. State the number of protons.
- 16th December 1980Give two observations when lithium is added to water.
- 17th December 1980State the value of the Avogadro constant and what it counts.
- 18th December 1980State whether the combustion of methane is exothermic or endothermic.
- 19th December 1980State the two named reactants used in the Haber process.
- 20th December 1980Write the ionic equation for the precipitation reaction between barium ions and sulfate ions.
- 21st December 1980Write the equation linking power, energy and time, and rearrange it for time.
- 22nd December 1980Two resistors are connected in parallel across a 12 V battery. State the potential difference across each resistor.
- 23rd December 1980A gas is heated in a sealed rigid container. Explain what happens to the pressure.
- 24th December 1980A ball decelerates uniformly from 18 m/s to 0 m/s over a distance of 2.7 m while being caught. Using (final velocity)^2 = (initial velocity)^2 + 2 x acceleration x distance, calculate its deceleration.
- 25th December 1980An X-ray has a wavelength of 1 x 10^-10 m. Calculate its frequency (speed of light = 3 x 10^8 m/s).
- 26th December 1980A satellite in a stable, small-radius, close orbit around the Earth is compared with a satellite in a stable, large-radius, distant orbit. State which of the two satellites has the greater orbital speed.
- 27th December 1980Define an undifferentiated cell.
- 28th December 1980Which tissue transports water and mineral ions from the roots?
- 29th December 1980Give three uses of the glucose produced in photosynthesis.
- 30th December 1980Give one piece of evidence that supports Darwin's theory of evolution by natural selection.
- 31st December 1980A peat bog covered an area of 850 hectares in 2015. By 2025, drainage for farmland had reduced the peat bog to 680 hectares. Calculate the percentage decrease in the area of the peat bog.