SWBAT: Explore how mass effects the transfer of heat. Date: 9/28/15 DO NOW: Will a large cup or a small cup of water heat up faster? Explain your answer.

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Presentation transcript:

SWBAT: Explore how mass effects the transfer of heat. Date: 9/28/15 DO NOW: Will a large cup or a small cup of water heat up faster? Explain your answer. Directions: 1.Copy homework into your Agenda. 2.Head page 31 Do Now 9/28 -10/2 3.Head page 32 “Measuring Rate of Heat Loss”

Lab Safety Review- Demo Hot Water – Safety Review Be careful when handling hot glassware and apparatus in the laboratory. Hot glassware looks just like cold glassware. water faucets when not in use. Turn off all heating apparatus, gas valves, and water faucets when not in use. Keep work area neat and free of any unnecessary objects.

Lab Safety Review Review the location of and know how to operate the following: – Fire extinguishers – Alarm systems with pull stations – Fire blankets – Eye washes – First-aid kits – Deluge safety showers

Lab Safety Review Everyone Everyone need to follow the lab safety rules. It is a matter of SAFETY!!!!

Vocabulary Words Mass- Mass- A measure of how much matter is in an object. Initial temperature Initial temperature – the temperature at the beginning of the demonstration.

Question: Do different amounts of water cool at different rates? Make a claim. I claim that different amounts of water cool/do not cool at different rates. Explain your thinking. Explain your thinking. (think about your previous experiences) I think that this happens because...

Directions - Demo Part 1: 1 Fill up the large beaker halfway with boiling water 2. Fill up the small beaker halfway with boiling water 3. Measure the initial temperature of each beaker by using a digital thermometer. 4. Start the stop watch quickly after taking the initial reading.

Observations Collect the digital temperature reading every minute for the next 15 minutes and record on the Part 2 Chart.

SE- Scientific Explanation/Claim SE- Write a scientific explanation to answer the question that includes a scientific claim based on observations or obtained information, scientific evidence from your observations, and scientific reasoning. Your reasoning should describe how the evidence links to the claim and may include a scientific concept or principle. Claim: The more water in the beaker, the (faster/slower) the temperature drops.

Evidence (What was the temperature of the water in each beaker the first time you measured it? After 8 minutes? After 15 minutes?) The initial temperature of the water in the large beaker was __________°C. After 8 minutes, the temperature of the water in the large beaker was ____________°C. After 15 minutes, the temperature of the water in the large beaker was ___________ °C. The initial temperature of the water in the smaller beaker was __________°C. After 8 minutes, the temperature of the water in the smaller beaker was ____________°C. After 15 minutes, the temperature of the water in the smaller beaker was ___________ °C.

Reasoning: Why did the rate of temperature change differ between the two beakers? Due to the greater mass of the larger beaker, the temperature of the water inside that beaker dropped slower as shown in the initial temperature of __________°C and the final temperature taken after 15 minutes of _____________°C. Due to the smaller mass of the smaller beaker, the temperature of the water inside that beaker dropped faster from its initial temperature of ________°C to the final temperature taken after 15 minutes of ________ °C.

Video Watch video “ Matter Changing States” - Review hemistry/matterchangingstates/