Daily Practice · GCSE Science
December 1991 5-a-day
Every sheet in December 1991
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 1991Write the formula of calcium chloride and explain the ratio.
- 2nd December 1991A 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.
- 3rd December 1991Hydrogen 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.
- 4th December 1991Describe the colour change seen when an alkene is shaken with bromine water.
- 5th December 1991Name the two gases released in large amounts by volcanic activity that formed most of the Earth's early atmosphere.
- 6th December 1991Name the energy store associated with a moving car.
- 7th December 1991Give the equation linking energy transferred, charge flow and potential difference.
- 8th December 1991Who provided the evidence for the existence of the neutron, and roughly when relative to the nuclear model?
- 9th December 1991State the name of the upward force acting on an object placed in a fluid.
- 10th December 1991A current-carrying wire experiences a force of 1.2 N when placed at right angles to a magnetic field of flux density 0.40 T, carrying a current of 6.0 A. Calculate the length of wire in the field.
- 11th December 1991Why does taking repeat readings and calculating a mean improve the data?
- 12th December 1991State the type of large biological molecule that all enzymes are made from.
- 13th December 1991State two ways measles is prevented from spreading.
- 14th December 1991State one difference between nervous and hormonal coordination.
- 15th December 1991State what is meant by a selection pressure.
- 16th December 1991A 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.
- 17th December 1991Give two observations when lithium is added to water.
- 18th December 1991State the value of the Avogadro constant and what it counts.
- 19th December 1991Using the values in the previous question, calculate the overall energy change for the reaction.
- 20th December 1991State Le Chatelier's principle in your own words.
- 21st December 1991Write the ionic equation for the precipitation reaction between barium ions and sulfate ions.
- 22nd December 1991Write the equation linking power, energy and time, and rearrange it for time.
- 23rd December 1991A resistor of resistance 15 ohm is connected to a 6.0 V supply. Calculate the current flowing through it. Use V = I x R.
- 24th December 1991A gas is heated in a sealed rigid container. Explain what happens to the pressure.
- 25th December 1991On a velocity-time graph, what does the area between the line and the time axis represent?
- 26th December 1991State the speed of all electromagnetic waves travelling through a vacuum.
- 27th December 1991State the name of the force that keeps a satellite in orbit around the Earth.
- 28th December 1991Define an undifferentiated cell.
- 29th December 1991Which tissue transports water and mineral ions from the roots?
- 30th December 1991Give three uses of the glucose produced in photosynthesis.
- 31st December 1991A plant grown in the shade is shorter than a genetically identical plant of the same species grown in full sunlight. State whether this difference is genetic variation, environmental variation, or both.