题目内容

Which of the calculation about significant figures is incorrect?

A. 0.03050 has 4 significant digits.
B. 12.050 has 5 significant digits.
C. pH = 5.25 has 3 significant digits.
D. 7.2×10–5 has 2 significant digits.

查看答案

搜索结果不匹配？点我反馈

更多问题

Which of the following statements about errors is wrong?

A. Uncalibrated instrument will cause errors
B. Impure reagents will cause measurement errors
C. System errors can be eliminated by improving test methods
D. Random errors can be eliminated by improving test methods

查看答案

All errors can be eliminated by the proper methods.

查看答案

Standard deviation can better reflect the closeness of analysis results.

查看答案

The average value of a set of data is very close to the true value, indicating that the measurement is very accurate.

查看答案

Which of the calculation about significant figures is incorrect?

A. 0.03050 has 4 significant digits. B. 12.050 has 5 significant digits. C. pH = 5.25 has 3 significant digits. D. 7.2×10–5 has 2 significant digits.

Which of the following statements about errors is wrong?

All errors can be eliminated by the proper methods.

Standard deviation can better reflect the closeness of analysis results.

The average value of a set of data is very close to the true value, indicating that the measurement is very accurate.

A. 0.03050 has 4 significant digits.
B. 12.050 has 5 significant digits.
C. pH = 5.25 has 3 significant digits.
D. 7.2×10–5 has 2 significant digits.