Ammonium Nitrate

SCIENCE REPORT

AMMONIUM NITRATE

NH4NO3

Problem

Our task was to investigate what the optimum ratio of solute to solvent that will produce the maximum cooling/heating effect?

Hypothesis

With a smaller quantity of water (50mls) and the same amount of Ammonium Nitrate added. After any period of time the mixture will be a cooler temperature than that of a mixture with a larger quantity of water.

Variables

„X Water

„X Teaspoons

„X Time

„X Ammonium Nitrate

„X Thermometer

„X Stirring (used thermometer)

„« Changed/Uncontrolled Variables

- The amount of times the mixture was stirred. We stirred the mixture until the Ammonium Nitrate was dissolved, so the amount of times we stirred after each teaspoon was different.

- Each teaspoon may not have been equal. Measurements were made based on judgment and not exact measurements.

„« Controlled Variables

- Amount of water used in each test was equal (100mls and 50mls).

- Total amount of Ammonium Nitrate used (150grams).

- Temperature was measured after and exact time i.e. 1 minute, 2 minutes, 3 minutes.

Equipment

Trial test

„X 1 thermometer

„X 1 plastic teaspoon

„X Safety glasses

„X 100ml beaker

„X 30mls of water

„X 1 teaspoon of Ammonium Nitrate

„X 1 graduated cylinder

„X 1 stirring rod

First Test

„X 1 thermometer

„X 1 plastic teaspoon

„X 1 stop watch

„X 1 stirring rod

„X Safety glasses X3 (one for each group member)

„X 250ml beaker

„X 1 graduated cylinder

„X 150 grams of Ammonium Nitrate

„X 100mls of water

Second Test

„X 1 thermometer

„X 1 plastic teaspoon

„X 1 stop watch

„X 1 stirring rod

„X Safety glasses X3 (one for each group member)

„X 100ml beaker

„X 1 graduated cylinder

„X leftover from original 150 grams of Ammonium Nitrate

„X 50mls of water