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

NOTE: The stirring rod was not used in the First and Second experiments, as it was not available. A substitute we used the thermometer.

Methods

Trial Test
In a 100ml beaker 30mls of water was placed the