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Essay text:
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...
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