Cold Pack Lab - Prelab Questions

Read the lab assignment, then answer the following.

1. in your experience, in what direction does heat exchange occur? (How does heat flow?)
2. Why are plastic foam cups used instead of glass?
3. Why should ammonium nitrate not be exposed to an open flame or to temperature above 250∞C?
4. Why should clothing splashed with ammonium nitrate solution be rinsed immediately with water?
5. Describe an effective cold pack – what does ‘effective’ mean here?
6. Name 4 things you will need in this lab beside safety equipment.
7. Will energy be released or absorbed in this experiment?
8. What is the target temperature in this experiment? If you say the freezing point of ice, what is this in ºC?
9. What is the chemical formula for ammonium nitrate.
10. What things should you observe to record in the data table?

11. You are asked to create a line graph with mass as the independent variable. What is the dependent variable? What axis are these variables placed on?