Question

1. a student was trying to determine how many ice cubes would be needed to keep a glass containing 250 ml of water under 15°c for a minimum of 30 minutes. the student placed varying numbers of ice cubes in different cups and recorded the time it took for the water to warm up to 15°c. the student then performed the same experiment each day for a week. why did the student perform multiple trials of the same experiment?

a. to include additional variables in the experiment.
b. to complete the steps of the experiment in less time.
c. to find a less expensive way to conduct the experiment.
d. to increase the likelihood of accurate experimental results.

1. results in science are not generally accepted as being accurate until they can be verified. which of the following is an example of replication?

a. a student designs an experiment on plant growth that includes multiple trials.
b. one scientist carries out the same experiment performed by another scientist to validate the results.
c. a scientist poses a new question for investigation after reading the results of another scientists work.
d. a scientist analyzes the data included in the published work of another scientist and agrees with the conclusions.

Explanation:

For question 10:

• In an experiment, performing multiple trials helps to reduce the impact of random errors. By repeating the experiment (same experiment each day for a week), the student can get more reliable data. This increases the likelihood of accurate experimental results.
• Option A: Additional variables are not added by doing multiple trials of the same experiment.
• Option B: Doing multiple trials (each day for a week) does not complete the steps in less time.
• Option C: There is no indication that multiple trials make the experiment less expensive.

For question 11:

• Replication in science means that another scientist (or group) repeats the same experiment. This is to validate the results.
• Option A: A student including multiple trials in their own experiment is about repetition within one - experiment setup, not replication (which is between different scientists).
• Option C: Posing a new question is not replication.
• Option D: Analyzing data and agreeing with conclusions is not the same as actually replicating (re - doing) the experiment.

Answer:

1. D. To increase the likelihood of accurate experimental results.
2. B. One scientist carries out the same experiment performed by another scientist to validate the results.