Question 1

Which of the following best describes the purpose of the scientific method in chemistry?

Accepted Answer

To provide a systematic approach for investigating natural phenomena and solving problems.

Question 2

Which of the following numbers has the correct number of significant figures: $$0.00450$$?

Accepted Answer

3 significant figures

Question 3

Convert $$3.25 	imes 10^4$ to standard notation.

Accepted Answer

$$32,500$$

Question 4

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

Accepted Answer

$$3.1 g/mL$$

Question 5

Which of the following is the correct way to round $$5.6789 to $$three significant figures?

Accepted Answer

$$5.68$$

Question 6

Which measurement contains exactly four significant figures?

Accepted Answer

$$0.04050$$

Question 7

A nurse needs to administer $$0.0250 L of a $$medication. How many milliliters is this, using scientific notation and the correct number of significant figures?

Accepted Answer

$$2.50 	imes 10^1$ mL

Question 8

Which of the following best describes the dependent variable in a scientific experiment?

Accepted Answer

The variable that is measured as a result of changes in the experiment.

Question 9

When multiplying $$2.34 (3 $$sig figs) by $$1.2 (2 $$sig figs), what is the correct answer with the proper number of significant figures?

Accepted Answer

$$2.8$$

Question 10

A thermometer reads $$98.60$$ °F. How many significant figures are in this measurement?

Accepted Answer

4

Question 11

Which of the following best represents the correct way to express $$0.000560 in $$scientific notation with the correct number of significant figures?

Accepted Answer

$$5.60 	imes 10$$^{-4}$$

Question 12

A student records the following data from a graph: time (s) vs. temperature (°C). What is the independent variable?

Accepted Answer

Time (s)

Question 13

Which of the following is the correct result for $$4.56 + 1.4$$, rounded to the correct number of decimal places?

Accepted Answer

$$6.0$$

Question 14

A laboratory balance gives a reading of $$0.0700 g. $$How many significant figures does this measurement have?

Accepted Answer

3

Question 15

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring experimental results

Question 16

A patient’s blood sample is measured as $$0.00560 L. $$How many significant figures are in this measurement?

Accepted Answer

4

Question 17

Which of the following best describes why significant figures are important in scientific measurements?

Accepted Answer

They indicate the precision of a measurement.

Question 18

A solution is measured as $$0.250 L. $$Express this value in milliliters using scientific notation and the correct number of significant figures.

Accepted Answer

$$2.50 	imes 10^2$ mL

Question 19

Which of the following is the correct answer for $$6.022 	imes 10$$^{23}$$ 	imes 2.0 	imes 10$$^{-3}$$, using scientific notation and the correct number of significant figures?

Accepted Answer

$$1.2 	imes 10$$^{21}$$

Scientific Notation, Significant Figures, and Measurement in Chemistry

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