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. container for storing chemicals
b. instrument for measuring time
c. tool for observing changes in substances
d. device for measuring temperature

Explanation:

The sentence mentions using the "chronometer" to track the duration of chemical reactions. Duration refers to time - length. So, it is an instrument for measuring time.

Answer:

B. instrument for measuring time