Answer:Experimental Question: How does the amount of a substance affect the rate at which temperature changes?
It depends on the conductivity of the material. If the shift is extreme, the temperature near the heating / cooling source will be similar to the temperature of the heating / cooling source and it will take time for the remainder of the material to rise to temperature. It will depend on the conductivity of the material.
Hypothes is:
Materials List:
• digital stopwatch
• 250ml beaker
• rubber bung
• thermometer
• bunsen burner
• tripod
• gauze
• retort stand and clamp
• goggles
Safety Procedures *:
1. Adult supervision is required.
2. Wear safety goggles, apron, and closed-toe shoes.
3. Do not wear baggy sleeves or dangling jewelry. Tie long hair back.
4. Use hot pads or oven mitts to handle hot objects.
5. Do not reach over a hot burner.
6. Do not leave the experiment unattended.
7. Clean up spills immediately.
8. Report any injuries to your Learning Coach or adult supervisor immediately
Experimental Procedures :
• Fill an empty beaker with exactly 150ml of water (check side-scale of beaker)
• Set up apparatus as shown above. Ensure the thermometer is about 2cm above the bottom of the beaker.
• Light the bunsen burner and put on a blue flame. Heat up the water.
• When the temperature on the thermometer has reached 90°C, immediately switch off the burner.
• Start the stopwatch and time for 5.0 minutes.
• Read the thermometer value at the 5.0 minute mark.
• Before repeating the experiment, check the level of water is still 150ml
Data Table:
Start Temperature of Water (°C) Temperature after 5min (°C) Drop in Temperature
(°C) Average Rate of Cooling x 1000 (°C/s)
80 70 10 17
75 66 9 15
70 62 8 13
65 59 6 10
60 55 5 8
Analysis:
Conclusions : There is a strong correlation between the average rate of cooling and the start temperature: the greater the start temperature, the faster the average rate of cooling.
Explanation:
use quillbot or this will be considered plagerism
