Question 1

A student measures the mass of a sample three times and obtains the values 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.00 g. Which statement best describes the student's measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 2

Which of the following best describes the relationship between measurement and uncertainty in scientific experiments?

Accepted Answer

Every measurement has an associated uncertainty due to limitations in instruments and human error.

Question 3

Which of the following units is most appropriate for measuring the volume of a liquid medicine dose?

Accepted Answer

$$\mathrm{mL}$$

Question 4

How many significant figures are in the measurement 0.004560 g?

Accepted Answer

4

Question 5

A laboratory thermometer reads 21.7 $$^\circC. If $$the thermometer is only accurate to the tenths place, how should the temperature be recorded using significant figures?

Accepted Answer

21.7 $$^\circC$$

Question 6

Convert 5.00 kilometers to meters. (1 km = 1000 m)

Accepted Answer

$$5.00 	imes 10^3$ m

Question 7

Which of the following is NOT one of the five traditional areas of study in chemistry?

Accepted Answer

Nuclear Chemistry

Question 8

A scientist is developing a new drug to treat cancer. Is this an example of pure or applied science?

Accepted Answer

Applied science, because it is aimed at solving a specific problem.

Question 9

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 10

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout.

Question 11

Which separation technique would be most appropriate to separate sand from salt water?

Accepted Answer

Filtration

Question 12

Which part of a Bunsen burner is responsible for controlling the amount of air mixing with the gas?

Accepted Answer

The air intake (collar)

Question 13

Which region of a Bunsen burner flame is the hottest in a properly adjusted (roaring) flame?

Accepted Answer

The tip of the inner blue cone

Question 14

A student records the mass of a beaker as 150.0 g and the mass of the beaker plus a sample as 154.32 g. What is the mass of the sample, and how many significant figures should the answer have?

Accepted Answer

$$4.32 g$$, 4 significant figures

Question 15

Which of the following is an extensive property?

Accepted Answer

Mass

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 17

A chemist needs to separate a mixture of colored dyes. Which technique should be used?

Accepted Answer

Chromatography

Question 18

Which of the following best describes the flame produced by a Bunsen burner when the air supply is limited?

Accepted Answer

A yellow, luminous flame

Question 19

A sample of water has a mass of 36.0 g and a volume of 36.0 mL. What is the density of the water, and how many significant figures should the answer have?

Accepted Answer

$$1.00 g/mL$$, 3 significant figures

Question 20

Which of the following is the correct conversion for 250 milliliters to liters?

Accepted Answer

$$0.250 L$$

General Chemistry: Measurement, Properties, and Laboratory Techniques Study Guide

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