Question 1

Which of the following statements best describes a qualitative observation?

Accepted Answer

The solution changed color from blue to green.

Question 2

A student measures the length of a rod three times and records 12.34 cm, 12.35 cm, and 12.33 cm. The actual length is 12.00 cm. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is an example of a systematic (determinate) error?

Accepted Answer

A balance that always reads 0.05 g too high.

Question 4

Which of the following is the correct SI unit for luminous intensity?

Accepted Answer

candela (cd)

Question 5

Convert 0.0056 kilometers to centimeters using the correct number of significant figures.

Accepted Answer

$$560 cm$$

Question 6

A sample has a mass of 25.0 g and a volume of 5.00 cm$$^3. $$What is its density, reported with the correct number of significant figures?

Accepted Answer

$$5.00$$ $$g/cm^3$

Question 7

Which of the following numbers has three significant figures?

Accepted Answer

0.0310

Question 8

A temperature is measured as 25.0 °C. What is this temperature in Kelvin?

Accepted Answer

$$298.15 K$$

Question 9

Which of the following best describes an intensive property?

Accepted Answer

It is independent of the amount of substance present.

Question 10

A reaction absorbs heat from the surroundings and the temperature of the surroundings decreases. This process is:

Accepted Answer

Endothermic

Question 11

How many significant figures should be reported for the result of $$3.56 	imes 4.0$$?

Accepted Answer

One

Question 12

Which of the following is an exact value?

Accepted Answer

100 pennies = $1

Question 13

A graduated cylinder is marked every 0.1 mL. If the meniscus is between 4.5 and 4.6 mL, what is the best way to record the measurement?

Accepted Answer

4.56 mL

Question 14

Which of the following is the correct scientific notation for 0.0310 with the correct number of significant figures?

Accepted Answer

$$3.10 	imes 10$$^{-2}$$

Question 15

A sample of mercury has a density of $$13.6 \ \mathrm{g/cm^3$}. $$What is the mass in grams of $$95.0 \ \mathrm{mL} of $$mercury?

Accepted Answer

$$1.3 	imes 10^3$ g

Question 16

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$$^\circ F = 1.8(^\circ C) + 32$$

Question 17

Which of the following best describes the First Law of Thermodynamics?

Accepted Answer

Energy of the universe is conserved.

Question 18

A student needs to convert 2.00 feet to inches. Which conversion factor should be used?

Accepted Answer

$$\frac{12 \ \mathrm{in}}{1 \ \mathrm{ft}}$$

Question 19

Which of the following is true about the reporting of significant figures in multiplication and division?

Accepted Answer

The answer should have as many significant figures as the value with the fewest significant figures.

Essentials: Units, Measurements, and Problem Solving

Study Guide - Practice Questions

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