"In order for a chemical reaction to occur, the particles, atoms or ions which are reactants, must physically come into contact with one another. Anything that increases the frequency of these encounters will increase the rate at which products are formed.
The rate of a chemical reaction can be increased by increasing the temperature of the reaction" -Lab Sheet
How does temperature affect chemical reactions?
The lab was conducted in three tests, one heated, one at room temperature, and one cold. An alka-seltzer tablet was dropped into each one, and temperature, time, and reaction was recorded.
In the heat test, the water was 24˚C to begin. It was heated to 50˚ C, and then taken off the hot plate. At about 45˚C the water began to bubble. The alka-seltzer tablet was the added, and reacted and fizzled for 39.18 seconds. The temperature fluctuated almost 5˚C while the reaction was taking place.
In the room temperature test, the water was 23.6˚C. After sitting for a minute, it rose to 23.8˚C. The tablet was then added, and it reacted for 41.49 seconds. It took longer at room temperature to dissolve the tablet. The temperature dropped .7˚C during the reaction.
In the cold water test, the water was 12.5˚C when the ice was first added. After a minute of stirring, it dropped to 2.8˚C and most of the ice had completely dissolved. The reaction lasted for 1 minute 55.23 seconds. The tablet jumped around in the bottom of the beaker. It took almost triple the length of the hot reaction. When the temperature probe was near the dissolving tablet, the temperature went up. Overall the temperature change was 1.9˚C.
The tablet was releasing energy in the reaction, because whenever the probe was close to it, more heat was recorded. Also, the hotter the water, the more energy. So when the most energy was combined, it produced the fastest reaction.
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