Here is a write up of an experiment on heat transfer. The independent variable in this experiment is the _________ of the container. What one word completes the sentence?

An experiment was carried out as described below. The sodium hydrogencarbonate was added to __________ the mixture. What word completes this sentence?

Look at the image below. Molly boils some water and pours it into a beaker. She records its temperature, covers it for 5 minutes, and then records its temperature again. She repeats this experiment with two different types of insulating material: newspaper and bubble wrap. Her results are below. As well as the starting temperature, the __________ of the water must be the same for all three trials. What word completes the sentence?

Write down what the independent and dependent variables are in this experiment.

. A company has made a new material called ‘Wellwarm’. They want to use ‘Wellwarm’ to make coats. (a) A scientist tested ‘Wellwarm’ to see how well it insulated a beaker of hot water. She tested ‘Wellwarm’ and three other materials as shown below. She wrapped each beaker in a different material. She recorded the temperature at the start and 20 minutes later. (i) What was the independent variable that the scientist changed? (ii) What was the dependent variable that the scientist measured during the investigation? (b) The results of the investigation are shown below. time (minutes) temperature of water (°C) wrapped in material A material B material C material D 0 60 60 60 60 20 34 40 38 36 material A material B material C material D thermometerlidPrimaryTools.co.ukPrimaryTools.co.uk KS3/09/Sc/Tier 3–6/P1 19 Total 8 9c 1 mark 9bii 1 mark 9c 1 mark 9d 1 mark 9e 1 mark (i) The scientist said that the ‘Wellwarm’ material is the best insulator. Which material was ‘Wellwarm’? Use the results to help you. Tick the correct box. (ii) Use the evidence in the results table to explain your choice. (c) The company made a coat from each of the four materials they tested. A person tested the different coats by wearing each one in a cold room. He measured the temperature inside each coat for 30 minutes. Write down two other variables that should be controlled to make this a fair test. 1. 2. (d) Write down one thing the scientists should do to make sure the person testing the coats is safe. (e) Suggest one advantage of using a temperature sensor and data logger instead of a thermometer in this experiment. maximum 8 marks 9bi 1 mark

In the equation for specific heat capacity, temperature is measured using the units degrees __________. What word completes the sentence? Give the full name, not the symbol.