Answer all the questions. A student completes an experiment to find the specific heat capacity of a metal.
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1 Answer all the questions. 1(a). A student completes an experiment to find the specific heat capacity of a metal. (i) The student takes voltage and current measurements. Suggest three other measurements they need to take? [3] (ii) Describe how these measurements could be used to determine the specific heat capacity of the metal. OCR You may photocopy this page. 1 of 8 Created in ExamBuilder
2 (b). The value obtained from the experiment is much higher than expected. Suggest two reasons how this could have occurred and suggest two improvements to the experimental procedure. [4] OCR You may photocopy this page. 2 of 8 Created in ExamBuilder
3 2(a). A student completes an experiment to find the specific heat capacity of a metal. (i) The student takes voltage and current measurements. Suggest three other measurements they need to take? [3] (ii) Describe how these measurements could be used to determine the specific heat capacity of the metal. (b). The value obtained from the experiment is much higher than expected. Suggest two reasons how this could have occurred and two improvements to the experimental procedure. [4] OCR You may photocopy this page. 3 of 8 Created in ExamBuilder
4 3(a). Alex has two radiators in her home. They are filled with 10 kg of different liquids. The table below shows information about oil and water. Material Specific heat capacity (J/kg C) Freezing point ( C) Boiling point ( C) Oil Water Alex's conservatory can be very cold. Sometimes it can get as low as 6 C. Alex thinks that the oil radiator may be better for the conservatory. Suggest why. [1] (b). Both radiators in a home have a cut-out which prevents them getting hotter than 60 C. Suggest why. [1] OCR You may photocopy this page. 4 of 8 Created in ExamBuilder
5 (c). Alex does a calculation. She knows that the oil heater produces 800 J of energy each second. Calculate the energy produced by the oil heater in 10 minutes. answer: J (d). (i) Alex wants the oil heater to heat up by 40 C. How much energy is needed? Show your working. answer: J (ii) She supplies enough energy to heat up the oil radiator by 40 C but it only heats up to 32 C. Suggest two reasons why. END OF QUESTION PAPER OCR You may photocopy this page. 5 of 8 Created in ExamBuilder
6 Question Answer/Indicative content Marks Guidance 1 a i Temperature rise or start and end temperatures (1) Time that the heater is switched on (1) Mass of the block (1) 3 ii Reference to: energy = voltage current time (1) SHC = energy / (mass temp rise) (1) 2 b Any two reasons and any two improvements Reasons Heat escapes to the surroundings (1) Part of the immersion heater is outside of the block (1) Poor thermal contact between the immersion heater and block (1) It takes time for the thermometer to reach its maximum temperature (once the heater is turned off) (1) Improvements Lag / insulate the aluminium block (1) Make sure all of the heater is in the block / use a smaller heater (1) Use petroleum jelly to transfer heat between the immersion heater and the block (1) Wait until the maximum temperature is reached (1) 4 Max 2 reasons and 2 improvements ALLOW (idea of) residual heat not reaching the block before the final temperature is recorded. Total 9 2 a i Temperature rise or start and end temperatures (1) Time that the heater is switched on (1) Mass of the block (1) 3 ii Reference to: energy = voltage current time (1) SHC = energy / (mass temp rise) (1) 2 OCR You may photocopy this page. 6 of 8 Created in ExamBuilder
7 Question Answer/Indicative content Marks Guidance b Any two reasons and any two improvements Reasons Heat escapes to the surroundings (1) Part of the immersion heater is outside of the block (1) Poor thermal contact between the immersion heater and block (1) It takes time for the thermometer to reach its maximum temperature (once the heater is turned off) (1) Improvements Lag / insulate the aluminium block (1) Make sure all of the heater is in the block/use a smaller heater (1) Use petroleum jelly to transfer heat between the immersion heater and the block (1) Wait until the maximum temperature is reached (1) Improvements Lag / insulate the aluminium block (1) Make sure all of the heater is in the block/use a smaller heater (1) Use petroleum jelly to transfer heat between the immersion heater and the block (1) Wait until the maximum temperature is reached (1). 4 Max 2 reasons and 2 improvements ALLOW (idea of) residual heat not reaching the block before the final temperature is recorded. ALLOW (idea of) residual heat not reaching the block before the final temperature is recorded. Total 9 OCR You may photocopy this page. 7 of 8 Created in ExamBuilder
8 Powered by TCPDF ( Question Answer/Indicative content Marks Guidance 3 a Oil will not freeze (as easily as water) / ORA (1) 1 b c Reduces risk of burns to people / children (1) Time conversion: = 600 seconds (1) / (J) (1) 1 2 ALLOW 480 (kj) d i Substitute into formula for specific heat capacity / (1) 2 ALLOW 680 (kj) ii (J) (1) Any two from: Some energy used to heat the radiator case (rather than the oil) (1) Energy passed from oil to air in room / oil undergoes cooling whilst heating up (1) Energy is dissipated to surroundings (1) It is not 100% efficient at transferring energy (1) 2 Total 8 OCR You may photocopy this page. 8 of 8 Created in ExamBuilder
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SCIENCE: Heat MATHEMATICS: Reading a thermometer AIM: Students understand the relationship between heat and density. BACKGROUND: How does a hot air balloon work? As the air inside the balloon becomes hotter
CLASS 7 ABOUT THIS PRACTICE TEST ANSWERING THE QUESTIONS EQUIPMENT ALLOWED IN THIS PRACTICE TEST ESTIMATED TIME FOR THIS PRACTICE TEST
LSS 7 OUT THIS PRTIE TEST This Practice Test has 15 questions. It has been designed to give you an idea of the main IT assessment. NSWERING THE QUESTIONS Each question has four options. hoose the EST answer