Ammonium Nitrate
Essay by review • November 23, 2010 • Study Guide • 517 Words (3 Pages) • 1,552 Views
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
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