Ammonium Nitrate

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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
„XWater
„XTeaspoons
„XTime
„XAmmonium Nitrate
„XThermometer
„XStirring (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
„X1 thermometer
„X1 plastic teaspoon
„XSafety glasses
„X100ml beaker
„X30mls of water
„X1 teaspoon of Ammonium Nitrate
„X1 graduated cylinder
„X1 stirring rod

First Test
„X1 thermometer
„X1 plastic teaspoon
„X1 stop watch
„X1 stirring rod
„XSafety glasses X3 (one for each group member)
„X250ml beaker
„X1 graduated cylinder
„X150 grams of Ammonium Nitrate
„X100mls of water

Second Test
„X1 thermometer
„X1 plastic teaspoon
„X1 stop watch
„X1 stirring rod
„XSafety glasses X3 (one for each group member)
„X100ml beaker
„X1 graduated cylinder
„Xleftover from original 150 grams of Ammonium Nitrate
„X50mls 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...
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