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6th grade Student Worksheet Heat Convection and Mathematical Expressions Activity Private Think Time: What does happen when water is heated in the microwave? What does happen when ice is added to water? Discuss with a Partner: How can you investigate this process? How can you test your hypothesis? Part I of the Investigation: 1. Measure 200 ml of water and place in microwave safe container. Measure its initial room temperature. Heat the water in the microwave for 1 minute. Record temperature after heating time. 2. Repeat same process as step no. 1; but double the heating time. 3. Repeat same process as step no. 1; but increase the heating time by adding 2 more minutes. 4. Repeat same process as step no. 1; but increase the heating time by adding 3 additional minutes. 5. Complete table below and calculate the change in temperature by subtracting the initial temperature from the final temperature. What do these procedural phrases mean in mathematical terms? Write the expressions: Direction Expression double the heating time increase the heating time by adding 2 more minutes increase the heating time by adding 3 additional minutes Subtracting the initial temperature from the final temperature Conduct Investigation and collect data: Trial Water Heating Initial Final Change in Amount Time Temperature Temperature Temperature 1 2 3 4 200 ml 200 ml 200 ml 200 ml 1 min What is the constant(s) in this investigation? What is the variable(s) in this investigation? Analyze data collected. What will happen after warming the water in the microwave for 7 min? Use evidence from data collected to support your answer. Part II of the Investigation: 1. Measure 200 ml of water and place in container. Record its initial room temperature. Add 5 ice cubes and wait 2 minutes. Record temperature. 2. Repeat same process as step no. 1; but increase the number of ice cubes by the product of the original number and 2. 3. Repeat same process as step no. 1; but increase the number of ice cubes by having 3 times the original amount. 4. Repeat same process as step no. 1; but increase the number of ice cubes by adding 3 times more to the original amount. 5. Complete table below. The final temperature minus the initial temperature will give you the temperature change. What do these procedural phrases mean in mathematical terms? Write the expressions: Direction product of the original number and 2 3 times the original amount adding 3 times more to the original amount final temperature minus the initial temperature Expression Conduct Investigation and collect data: Trial Water Number of Initial Final Change in Amount Ice cube Temperature Temperature Temperature 1 2 3 4 200 ml 200 ml 200 ml 200 ml 5 What is the constant(s) in this investigation? What is the variable(s) in this investigation? Analyze data collected. What will happen after adding 35 ice cubes to the water? Use evidence from data collected to support your answer. Part III of the Investigation: What will happen when very hot water is placed near very cold water? What will happen to the air surrounding both water containers? 1. Warm up 200 ml of water in a microwave for 4 minutes. Add heated water to a container with 200 ml of room temperature water. 2. Place 35 ice cubes to a container with 200 ml of room temperature water. 3. Locate both containers side by side. 4. Lit an incense stick and place between the two containers. Observe and discuss your findings. 6th grade MSP Sep 2015- CMCSS Training