Tuesday, 15 March 2011

Chemical Reactions Lab Investigation

In this lab we tested out a chemical reaction. My hypothesis stated that when the chemical reactions occurred, the colder the water got the longer they would go on for. We had three separate tests. The first test was conducted with the water at 50 degrees Celsius, the second test was conducted at room temperature, and the third test was conducted after Ice had been dropped into the water, and it had cooled to -1 degrees celsius. For each of the tests we dropped a pelt of alka-selzer into the water.

-Hot test

For the first test we heated the water on a hot plate, until it was 50 degrees celsius. Then I used the tongs to pick up the heated beaker of water, and put it on the stand. We then proceeded to drop a pelt of alka-selzer into the hot water. The alka-selzer reacted with the water causing it to fizzle as the pelt dissolved. The reaction went on for a short 21 seconds.

-Room temperature test

For this test we emptied the beaker of water and refiled it with room temperature water. This water was about 21 degrees celsius. Once the alka-selzer pelt was dropped into the water, it began to fizzle once more.

-Cold test

-Picture of our cold reaction. You can see the ice in the cup is partially obsucred by bubbles produced by the reaction.

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