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P1.1.3 Energy transfer by heating GCSE items that can be used to define successful outcomes for peer and self assessment activities
Using Exam pro items to support successful outcomes Learners will be able to test their progress against learning outcomes using questions taken from past AQA GCSE questions. Assessment of practical work Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q1 foundation The diagram shows potatoes being baked in a gas oven. Each potato has a metal skewer pushed through it. Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q1 contd. (a) Explain how heat is transferred by the process of convection from the gas flame at the bottom of the oven to the potatoes at the top of the oven(3) (b) The metal skewers help the potatoes to cook by transferring heat to the inside of the potatoes. By what method is heat transferred through a metal skewer? (1) (c) When the potatoes are taken from the oven, they start to cool down. Suggest one factor that will affect how fast a potato cools down (1) Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q1 mark scheme (a) any three from: ignore reference to skewer (air) particles / molecules / atoms gain energy (air) particles / molecules / atoms move faster do not accept move more, do not accept move with a bigger amplitude / vibrate more (air) particles / molecules / atoms move apart air expands do not accept particles expand air becomes less dense warm / hot air rises do not accept heat rises3 (b) Conduction accept conductor 1 (c) any one from: temperature of the potato do not accept heat for temperature temperature of the surroundings / room / surface / atmosphere accept how hot the potato / room is size / mass / weight / volume of the potato shape of the potato surface area of the potato potato cut open insufficient nature of the surface of the potato type of surface it is placed on in a draught type of potato whether the skewers are left in or taken out1 Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q2 foundation AQA-PH1FP-QP-Jan12 Q7 The diagram shows two thermometers. The bulb of each thermometer is covered with a piece of wet cotton wool. One of the thermometers is placed in the draught from a fan. Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q2 contd. The graph shows how the temperature of each thermometer changes with time. Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q2 Contd. (a) Which of the graph lines, A or B, shows the temperature of the thermometer placed in the draught? Explain, in terms of evaporation, the reason for your answer. (3 marks) (b) A wet towel spread out and hung outside on a day without wind dries faster than an identical wet towel left rolled up in a plastic bag. Explain why. (2 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q2 mark scheme Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q3 higher The diagram shows a metal pan being used to heat water. Energy from the gas flame is transferred through the metal pan by conduction. Explain the process of conduction through metals. (4 marks) Version 2.0 Copyright © AQA and its licensors. All rights reserved.
Q3 mark scheme Version 2.0 Copyright © AQA and its licensors. All rights reserved.
B1.5 Energy and biomass in food chains GCSE items that can be used to define successful outcomes for peer and self assessment activities.
Version 2.0 Copyright © AQA and its licensors. All rights reserved. C (ii) Quantitative Chemistry.
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