$$0.0056\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5.6\ \mathrm{m}$$

$$^\circ F = (21.6 \times 1.8) + 32 = 70.9^\circ F$$

Question 1

Which of the following statements about SI base units is correct?

Accepted Answer

The SI base unit for length is the meter (m).

Question 2

A scientist measures the mass of a sample as 0.02340 kg. How many significant figures are in this measurement?

Accepted Answer

5

Question 3

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

Accepted Answer

Density

Question 4

A student needs to convert 25.0 °C to Kelvin. Which equation should they use, and what is the correct answer?

Accepted Answer

$$K = ^\circ C + 273.15$$; $$K = 298.15$$

Question 5

Which prefix multiplier corresponds to $$10^{-6}$$?

Accepted Answer

micro-

Question 6

A block of metal has a mass of 45.6 g and a volume of 16.0 cm$$^3. $$What is its density?

Accepted Answer

$$2.85\ \mathrm{g/cm^3$}$$

Question 7

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 8

A temperature is recorded as 86.0 °F. What is this temperature in Celsius?

Accepted Answer

$$^\circ C = (86.0 - 32) \div 1.8 = 30.0^\circ C$$

Question 9

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

Accepted Answer

Precision refers to how close repeated measurements are to each other; accuracy refers to how close a measurement is to the true value.

Question 10

A student records the following measurements: 0.00450 m, 2.30 m, and 100.0 m. How many significant figures are in each measurement, respectively?

Accepted Answer

3, 3, 4

Question 11

Which of the following conversions is correct for expressing 0.0056 kilometers in meters?

Accepted Answer

$$0.0056\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} = 5.6\ \mathrm{m}$$

Question 12

A sample of ethanol has a density of $$0.789\ \mathrm{g/mL}. $$What is the mass of $$250.0\ \mathrm{mL} of $$ethanol?

Accepted Answer

$$197.25\ \mathrm{g}$$

Question 13

Which of the following is NOT a derived SI unit?

Accepted Answer

Meter (m)

Question 14

A measurement is recorded as 0.07080 L. How many significant figures does this value have?

Accepted Answer

5

Question 15

A student is asked to convert 5.00 inches to centimeters. (1 inch = 2.54 cm, exact) How many significant figures should the answer have?

Accepted Answer

3

Question 16

Which of the following best explains why density is considered an intensive property?

Accepted Answer

Density is a ratio of mass to volume and does not change with sample size.

Question 17

A laboratory thermometer reads 21.6 °C. What is this temperature in Fahrenheit?

Accepted Answer

$$^\circ F = (21.6 	imes 1.8) + 32 = 70.9^\circ F$$

Question 18

Which of the following best describes the Kelvin temperature scale?

Accepted Answer

It assigns 0 K to the temperature at which molecular motion virtually stops.

Question 19

A student measures the length of a table as 2.300 m. Which rule for significant figures applies to this measurement?

Accepted Answer

Trailing zeros after a decimal point are significant.

Chapter 1: Matter, Measurement, and Problem Solving – Study Notes

Guida di studio - Domande di pratica