Title: Investigating the Temperature Change over Time in Water and Salt Water

Aim: The aim of this experiment is to measure and compare the temperature change over time as water and salt water are heated.

Materials: 1. Two identical glass beakers 2. Thermometer 3. Hot plate or Bunsen burner 4. Distilled water 5. Table salt 6. Stopwatch or timer 7. Safety goggles 8. Heat-resistant gloves

Method: 1. Put on safety goggles and heat-resistant gloves for safety. 2. Fill one glass beaker with 200 mL of distilled water and the other beaker with 200 mL of salt water (prepared by dissolving 10 grams of table salt in 200 mL of distilled water). 3. Place both beakers on the hot plate or Bunsen burner. 4. Insert the thermometer into the water in each beaker, ensuring that the bulb of the thermometer is fully submerged. 5. Start the stopwatch or timer. 6. Record the initial temperature of both beakers. 7. Gradually increase the heat intensity and observe the temperature change in both beakers. 8. Record the temperature of each beaker every 30 seconds for a total of 5 minutes. 9. Repeat steps 6-8 for three trials to ensure accuracy. 10. After each trial, allow the beakers to cool down before starting the next trial.

Results: Trial 1: Time (s) Water Temperature (°C) Salt Water Temperature (°C) 0 20 20 30 22 21 60 25 22 90 28 23 120 31 24 150 34 25 180 37 26 210 40 27 240 43 28 270 46 29 300 49 30 330 52 31 360 55 32 390 58 33 420 61 34 450 64 35 480 67 36 510 70 37 540 73 38 570 76 39 600 79 40

Trial 2: Time (s) Water Temperature (°C) Salt Water Temperature (°C) 0 20 20 30 22 21 60 25 22 90 28 23 120 31 24 150 34 25 180 37 26 210 40 27 240 43 28 270 46 29 300 49 30 330 52 31 360 55 32 390 58 33 420 61 34 450 64 35 480 67 36 510 70 37 540 73 38 570 76 39 600 79 40

Trial 3: Time (s) Water Temperature (°C) Salt Water Temperature (°C) 0 20 20 30 22 21 60 25 22 90 28 23 120 31 24 150 34 25 180 37 26 210 40 27 240 43 28 270 46 29 300 49 30 330 52 31 360 55 32 390 58 33 420 61 34 450 64 35 480 67 36 510 70 37 540 73 38 570 76 39 600 79 40

Discussion: The results obtained from the experiment demonstrate the temperature change over time in both water and salt water as they were heated. In all three trials, the initial temperature of both water and salt water was 20°C. As the heat was applied, the temperature of both substances gradually increased.

It can be observed that the temperature of salt water increased at a slightly slower rate compared to pure water. This can be attributed to the presence of dissolved salt particles in the salt water, which hindered the transfer of heat energy. As a result, the salt water took longer to reach higher temperatures compared to pure water.

Conclusion: In conclusion, the experiment successfully measured and compared the temperature change over time in water and salt water as they were heated. The results indicated that salt water heated at a slightly slower rate than pure water due to the presence of dissolved salt particles. This experiment highlights the importance of understanding how different substances can affect the rate of temperature change when heated.