Question 1

Which of the following best describes how to record a measurement using significant figures?

Accepted Answer

Record all digits you are sure of plus the first uncertain digit, and include the unit.

Question 2

How many significant figures are in the measurement $$0.0520 g$$?

Accepted Answer

$$3$$

Question 3

Why is it important to know the number of significant figures in measured values?

Accepted Answer

It relates to the measurement scale and ensures calculated results do not imply greater certainty than the measurements.

Question 4

Which of the following numbers has exactly $$4$$ significant figures?

Accepted Answer

$$0.004560$$

Question 5

A student measures the mass of a sample as $$12.30 g $$and the volume as $$4.0 mL. $$What is the density, reported to the correct number of significant figures?

Accepted Answer

$$3.1 g/mL$$

Question 6

Which rule applies when determining the number of significant figures in the result of $$2.34 	imes 1.2$$?

Accepted Answer

The result should have as many significant figures as the number with the fewest significant figures.

Question 7

How many significant figures are in the measurement $$500.0 mL$$?

Accepted Answer

$$4$$

Question 8

A scientist adds $$12.11 g$$, $$0.034 g$$, and $$1.3 g. $$What is the sum, reported to the correct number of decimal places?

Accepted Answer

$$13.4 g$$

Question 9

Which of the following statements about zeros is correct?

Accepted Answer

Trailing zeros in a number with a decimal point are significant.

Question 10

A measurement is recorded as $$0.07020 kg. $$How many significant figures does it have?

Accepted Answer

$$5$$

Question 11

You are given the following measurements: $$3.45 m$$, $$2.1 m$$, and $$0.678 m. $$What is the sum, reported to the correct number of decimal places?

Accepted Answer

$$6.2 m$$

Question 12

Which of the following best explains why calculated results cannot be expressed to a greater certainty than the measured values themselves?

Accepted Answer

Because the uncertainty in the measurement limits the certainty of the result.

Question 13

A student multiplies $$4.56 by$$ $$1.4. $$What is the product, reported to the correct number of significant figures?

Accepted Answer

$$6.4$$

Question 14

Which of the following numbers contains three significant figures?

Accepted Answer

$$0.00340$$

Question 15

A nurse measures a patient's temperature as $$37.00$$ °C. How many significant figures are in this measurement?

Accepted Answer

$$3$$

Question 16

Which of the following is the correct way to report the result of $$8.12 + 0.5$$?

Accepted Answer

$$8.6$$

Question 17

A chemist divides $$15.0 g by$$ $$2.5 mL. $$What is the result, reported to the correct number of significant figures?

Accepted Answer

$$6.0 g/mL$$

Question 18

Which of the following best describes a captive zero?

Accepted Answer

A zero between nonzero digits.

Question 19

A laboratory balance reads $$0.500 g. $$How many significant figures does this measurement have?

Accepted Answer

$$3$$

Question 20

A student subtracts $$12.11$$ from $$15.2. $$What is the result, reported to the correct number of decimal places?

Accepted Answer

$$3.1$$

Measurement and Significant Figures in Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard