Activity Water Heat Transfer Lab

Name:________________ __ Per:______ Activity –Water Phase Change Purpose: Track the temperature of water over time as heat is added to the system Procedure: See Instructions at Lab Stations Data/ Observations: Time Temperature (1 minute) ( °C) Phase/ phases water is in 0 Ice (solid phase) 1 2 3 4 5 6 7 8 9 Graph: your data from above Time (1 minute) Temperature ( °C) Phase/ phases water is in 10 11 12 13 14 15 16 17 18 19 Questions: 1. How warm can an ice cube get? Explain 2. The boiling point of water is 100 °C. What do you think the boiling point of a substance tells you? 3. How is it that the water temperature does not go above 100 °C, yet you’re still adding heat from the Bunsen burner? Where’s the heat going? Worksheet- Heat Transfer During Phase Changes Ice Cube Melting on a Counter Top: 1. Draw arrows showing which direction heat is being transferred, into, or out of, the ice cube. 2. Ice  Liquid a) Is ice releasing heat or taking heat from the environment when it melts? b) Is this process endothermic or exothermic for the ice? Explain. 3. What are 2 differences between the molecules of H20 in the puddle of water different from the molecules of water still in the solid ice cube? Water Freezing in an Ice Cube Tray: 1. Draw arrows showing which direction heat is being transferred when the ice cube tray is placed in the freezer. 2. Ice  Liquid a) When water is freezing, is it releasing heat or taking heat from the environment? b) Is this process endothermic or exothermic for the water? Explain. 3. In order to cool things in a refrigerator, heat must be transferred away from the food. Where do you think this heat ends up going? Boiling Water on the Stove: 1. Draw arrows showing which direction heat is being transferred in the image to the right. (Hint: it’s going 2 different places) 2. What temperature does the water, H20 (l), reach? How do you know? 3. What are 2 differences between the molecules of liquid water and water (gas)? 4. Water (l)  Water (g) (B on diagram)- is this process endothermic or exothermic? Explain. 5. Water (l)  Water (g) is this process endothermic or exothermic? Explain. 6. When is it colder outside- While it’s raining or after it rains? Explain using ideas from above. Procedure: 1. Set up your beaker above the Bunsen burner on the ring stand. Secure the thermometer in the beaker using the thermometer clamp. (DO NOT let the thermometer rest on the glass) 2. Put a handful ice cubes into the beaker. Record this temperature at time 0. 3. Turn on the Bunsen burner and heat the ice while stirring occasionally. 4. Record the temperature & phases every 1 minute until the water has been boiling for 5 minutes. Procedure: 1. Set up your beaker above the Bunsen burner on the ring stand. Secure the thermometer in the beaker using the thermometer clamp. (DO NOT let the thermometer rest on the glass) 2. Put a handful ice cubes into the beaker. Record this temperature at time 0. 3. Turn on the Bunsen burner and heat the ice while stirring occasionally. 4. Record the temperature & phases every 1 minute until the water has been boiling for 5 minutes. Procedure: 1. Set up your beaker above the Bunsen burner on the ring stand. Secure the thermometer in the beaker using the thermometer clamp. (DO NOT let the thermometer rest on the glass) 2. Put a handful ice cubes into the beaker. Record this temperature at time 0. 3. Turn on the Bunsen burner and heat the ice while stirring occasionally. 4. Record the temperature & phases every 1 minute until the water has been boiling for 5 minutes.