INVESTIGATION 1: Mini-investigation question 1: What will happen when you mix equal amounts of hot and cold water? - What is your prediction for question one? Why do you think this will happen? Mixing equal amounts of hot and cold water will produce a warm water with a temperature that is equal to the average temperature of the hot and cold water being added. In other words, it is between the hot and cold water temperature. My prediction is that the same volume of hot and cold water are being mixed. This will happen because of heat transfer from hot to cold water molecules. Conduct the investigation: - On one of your paper cups write a mark at about 'A of the cup. You will use this mark to make sure you use the same volume of water in each investigation. 0 Measure out cold water from the tap (just use the coldest water you can get) to the marked line in your cup and pour into one of the other cups. - Measure out hot water from the tap (just use the hottest water you can get) to the marked line in your cup and pour into one of the other cups. . Use your thermometers to measure the temperatures. Temperature of hot water = 7M7 C Temperature of cold water = 79 C Predicted nal temperature when they are mixed = _m_ C 0 Prepare to use your stopwatch. - Pour the two liquids into a third cup and measure the nal temperature. The final temperature is relatively stable, so when the temperature stops changing, you've reached the nal temperature. Measure the time it takes to reach this stable {emperature Actual nal temperature = _E C Time it took to reach a stable temperature: _It took around lminute and 13 seconds._ - Is there a difference between your prediction and what you observed? What might be an explanation for this? There is no major difference between what I predict and the actual result. The results are approximately the same and the 2-3OC difference is due to the environment because we don't perform the experiment in ideal conditions and there is some difference in the environment also like temperature and cup material. The hot and cold water average nal temperature is approximately 53-54%\" but we get an actual result of50C. Some difference due to like heat loss during mixing of water.some effect of nearby environmental temperature. material of cup like it is heat resistive or not. The difference due to these factors. INVESTIGATION 2 NIini investigation question two: What will happen when you mix double the amount of cold water with hot water? - What is your prediction for question two? Why do you think this will happen? The temperature of the resulting water is near the cold water temperature since its voltune is two times greater than hot water. My prediction is the relative volume of cold water compared to the hot water. This will happen because the volume of cold water is greater, hence, the heat transfer from hot water will be distributed even more. Conduct the investigation: - Measure out cold water from the tap (just use the coldest water you can get) to the marked line in your cup and pour into one of the other cups. Repeat this process so you have twice as much cold water. - Measure out hot water from the tap (just use the hottest water you can get) to the marked line in your cup and pour into one of the other cups. - Use your thermometers to measure the temperatures. Temperature of hot water = 7M7 C Temperature of cold water = _Q C Predicted nal temperature when they are mixed = _25-30_ C - Prepare to use your stopwatch. - Pour the two liquids into a third cup and measure the nal temperature. The nal temperature is relatively stable. so when the temperature stops changing. you've reached the nal temperature. Measure the time it takes to reach this stable temperature. Actual nal temperature = _ C Time it took to reach a stable temperature: _25 minutes - Is there a difference between your prediction and what you observed? What might be an explanation for this? No. there's not any difference between my prediction and what I'd observed. Mini investigation question three: What will happen when hot water in a plastic bag is placed into cold water? - What is your prediction for question three\".J Why do you think this will happen\".J Heat transfer will still take place and the temperature of the hot water will decrease while the temperature of the cold water will increase. My prediction is caused by the difference in temperature between the two types of water placed with a plastic boundary. This will happen because heat will still pass through the plastic boundary and permits heat transfer. INVESTIGATION 3: Mini investigation question three: What will happen when hot water in a plastic bag is placed into cold water? . What is your prediction for question three? Why do you think this will happen? Heat transfer will still take place and the temperature of the hot water will decrease while the temperature of the cold water will increase My prediction is caused by the difference in temperature between the two types of water placed with a plastic boundary. This will happen because heat will still pass through the plastic boundary and permits heat transfer Conduct the investigation: a Measure out cold water from the tap (just use the coldest water you can get) to the marked line in your cup and pour into one of the other cupsi Repeat this process so you have twice as much cold water. . Measure out hot water from the tap (just use the hottest water you can get) to the marked line in your cup. - Use your thermometers to measure the temperatures. Temperature of hot water = _100_ C Temperature of cold water = 0 C' Predicted nal temperature = _30-50_ C . Prepare to use your stopwatch. . Pour the hot water into the plastic bag. Piace the plastic bag of hot water into the cup that is lled with cold water. . Stick one thermometer into the hot water in the plastic bag and another into the cold water in the cup. This is a picture of the set-up: [ F'l _, 5' l '7 -' at . Measure and record the temperatures of both the water in the cup and the water in the bag each 30 seconds until they reach thermal equilibrium (have the same temperature). Make sure the cold thermometer is not touching the plastic bag. Actual nal temperature : 7E7 C