Question

read the sentences.
the scientist used a chronometer to accurately track the duration of each chemical reaction in the experiment. this precise data allowed her to analyze reaction rates with confidence.
what does the word \chronometer\ mean as it is used in the sentence?
a. device for measuring temperature
b. tool for observing changes in substances
c. container for storing chemicals
d. instrument for measuring time

Explanation:

The sentence mentions that the scientist used a chronometer to track the duration of chemical reactions. Duration refers to time. So, the chronometer is related to measuring time.

Answer:

D. instrument for measuring time