$$1 \\text{ kg} = 1000 \\text{ g}$$

Question 1

Which of the following best describes the difference between accuracy and precision in scientific measurements?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Question 2

A student measures the length of a nail as shown in the image. What is the correct way to report the length using significant digits?

Accepted Answer

6.35 cm

Question 3

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin ($$K)$$

Question 4

Convert 18.0 mL to liters using the correct number of significant digits.

Accepted Answer

$$1.80 \times 10$$^{-2}$$ L

Question 5

Which of the following is a derived SI unit?

Accepted Answer

Newton ($$N)$$

Question 6

A measurement is recorded as 0.00250 g. How many significant digits does this value have?

Accepted Answer

3

Question 7

Which of the following is the correct conversion factor to change kilograms to grams?

Accepted Answer

$$1 \text{ kg} = 1000 \text{ g}$$

Question 8

A scientist records the following masses: 2.50 g, 2.48 g, 2.51 g, and 2.49 g. The true mass is 2.00 g. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 9

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 10

A car’s speedometer reads 60 MPH. What is this speed in meters per second ($$m/s$$)? (1 mile = 1.609 km, 1 hour = 3600 s)

Accepted Answer

$$26.8 \ m/s$$

Question 11

Which of the following statements about scientific notation is correct?

Accepted Answer

Scientific notation clearly indicates the number of significant digits in a measurement.

Question 12

Which of the following is an example of a systematic error?

Accepted Answer

A balance that is not zeroed before measuring mass.

Question 13

When multiplying 4.56 (3 sig figs) by 1.4 (2 sig figs), what is the correct answer with the proper number of significant digits?

Accepted Answer

$$6.4$$

Question 14

Which of the following is the correct way to round 1.247 to two decimal places?

Accepted Answer

1.25

Question 15

A student adds 3.75 mL and 4.1 mL. What is the correct answer with the proper number of significant digits?

Accepted Answer

7.9 mL

Question 16

Which of the following is an exact number and does not limit the number of significant digits in a calculation?

Accepted Answer

1 meter = 100 centimeters

Question 17

Which prefix represents $$10^{-6} in $$the SI system?

Accepted Answer

Micro ($$\mu)$$

Question 18

A temperature is measured as 25 $$^C. $$What is this temperature in Kelvin?

Accepted Answer

$$298 \ K$$

Question 19

Which of the following best describes the scientific method?

Accepted Answer

A process involving observation, hypothesis, experiment, theory, and further testing.

Question 20

Which of the following is the correct formula for pressure in SI units?

Accepted Answer

$$P = \frac{F}{A}$$

Measurements and Units in General Chemistry

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