Key term
AQA GCSE Combined Science Physics 8464
Atomic Structure
Topic overviewThe structure of an atomMass number, atomic number and isotopesFrom the plum pudding model to the nuclear modelChadwick, the neutron, and comparing the modelsRadioactive decay and nuclear radiationNuclear equationsHalf-lives and the random nature of radioactive decayRadioactive contamination
Electricity
Topic overviewCircuit symbols, electrical charge and currentCurrent, resistance and potential differenceOhmic conductors, filament lamps, diodes and thermistorsLight-dependent resistors, and investigating resistanceCurrent and potential difference in series and parallelConstructing circuits, and calculating in series circuitsDirect and alternating potential difference, and mains electricityPower and efficiencyAppliances, and the energy transferred by electrical workPower, and the power ratings of domestic appliancesThe National Grid
Energy
Forces
Topic overviewScalars, vectors, forces and the resultant forceGravityWork done and energy transferStretching, compressing, and the spring constantLinear and non-linear extension, and work done on a springResolving forces and free body diagramsDistance, displacement and speedThe speed of sound, and the distance-speed-time equationVelocity and the distance-time relationshipAcceleration, deceleration and velocity-time graphsArea under a velocity-time graph, and the uniform acceleration equationNewton's First LawNewton's Second and Third LawsStopping distance and reaction timeFactors affecting braking distanceBraking force, deceleration and the dangers of stopping quicklyMomentum and its conservation
Magnetism and Electromagnetism
Particle Model of Matter
Particle Model of Matter
Changes of state and specific latent heat
- 3 things to know
- Physics Paper 1
Overview
Energy taken in during a change of state with no change in temperature, latent heat and specific latent heat, the equation E = mL with its units and calculations, specific latent heat of fusion and of vaporisation, reading a melting point from a heating graph, and how specific heat capacity and specific latent heat differ.
What you need to know
Answer each one before you reveal it.
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Key term
Explain why a thermometer in a beaker of melting ice reads a steady 0 °C while ice is still present.
Key term
State, in words, the equation for the energy needed for a change of state.
Questions from this subtopic
Each one with the model answer underneath.
- 1
During which process does a substance take in energy without its temperature changing?
Model answer
During a change of state.
- 2
What name is given to the energy needed for a substance to change state?
Model answer
Latent heat.
- 3
While a substance is changing state, what happens to the energy supplied to it?
Model answer
It increases the internal energy stored in the substance but does not change its temperature.
- 4
Explain why a thermometer in a beaker of melting ice reads a steady 0 °C while ice is still present.
Model answer
The energy supplied is being used to change the state of the ice rather than to raise its temperature.
- 5
Define the specific latent heat of a substance.
Model answer
It is the energy needed to change the state of one kilogram of the substance with no change in temperature.
- 6
State, in words, the equation for the energy needed for a change of state.
Model answer
Energy for a change of state = mass × specific latent heat.
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