l. Consider an experiment to determine the avera e rate of reaction of water. St
ID: 551217 • Letter: L
Question
l. Consider an experiment to determine the avera e rate of reaction of water. Students drop the antacid in the water and use a stopwatch to measure the time for the antacid to stop bubbling in the water. One student drops the antacid and another student watches and carefully starts the watch a. Identify two possible sources of systematic error: n ni Cdn b. Identify two possible sources of random error: 2. Human Error is often cited by students as a source of error. What type of error is most likely affecting results if human error is cited and why? 3. Why is it generally good practice to always use the most accurate and precise measurement instrument available?Explanation / Answer
1.
a. In the experiment systematic error : would be say the stopwatch did not start exactly at the same time it is pressed. The stopwatch is not set to zero at the beginning. both of these are related to tool used (stopwatch) and is termed as systematic error.
b. In the experiment sources of random error : would be say the time lag between the tablet of antacid dropped in water and the time the stopwatch was started. The tablet was not of the same weight in all the cases. these are unpredictable errors and give different value each time for the experiment.
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