Q: A student needs to convert $$5.00\ \mathrm{km} to $$meters. What is the correct answer and which prefix multiplier is used?

$$5.00 \times 10^3$\ \mathrm{m}$$; kilo-

Question 1

Which of the following statements best describes an intensive property?

Accepted Answer

It is independent of the amount of substance present.

Question 2

A student measures the mass of a metal sample as $$3.15\ \mathrm{g}$$ and its volume as $$0.233\ \mathrm{cm}^3. $$What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$13.5\ \mathrm{g/cm}^3$$

Question 3

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

Accepted Answer

Kelvin (K)

Question 4

Convert $$85.6^\circ\mathrm{F} to $$Kelvin. (Use $$^\circ\mathrm{C} = \frac{(^\circ\mathrm{F} - 32)}{1.8}$$ and $$K = ^\circ\mathrm{C} + 273.15)$$

Accepted Answer

$$302.0\ \mathrm{K}$$

Question 5

Which of the following numbers contains exactly three significant figures?

Accepted Answer

0.0540

Question 6

A patient’s temperature is measured as $$39.0^\circ\mathrm{C}. $$What is this temperature in Fahrenheit?

Accepted Answer

$$102.2^\circ\mathrm{F}$$

Question 7

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom

Question 8

A chemist needs to convert $$6.45\ \mathrm{m}^2 to$$ $$\mathrm{cm}^2. $$Which conversion factor should be used?

Accepted Answer

$$1\ \mathrm{m}^2 = 10,000\ \mathrm{cm}^2$$

Question 9

Which prefix multiplier corresponds to $$10^{-9}$$?

Accepted Answer

nano-

Question 10

A student records the following measurements: $$0.00340$$, $$2.50$$, and $$100.0. $$How many significant figures are in each measurement, respectively?

Accepted Answer

3, 3, 4

Question 11

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 12

A sample of ethanol has a mass of $$78.5\ \mathrm{g}$$ and a volume of $$99.0\ \mathrm{mL}. $$What is its density in $$\mathrm{g/mL}$$, reported to the correct number of significant figures?

Accepted Answer

$$0.793\ \mathrm{g/mL}$$

Question 13

Which of the following is a derived SI unit?

Accepted Answer

$$\mathrm{m}^3 ($$cubic meter)

Question 14

A nurse needs to administer a medication at a dosage of $$0.250\ \mathrm{mg}$$ per kilogram of body weight. If a patient weighs $$70.0\ \mathrm{kg}$$, how many milligrams of medication should be given?

Accepted Answer

$$17.5\ \mathrm{mg}$$

Question 15

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 16

A laboratory thermometer reads $$-40.0^\circ\mathrm{C}. $$What is this temperature in Fahrenheit?

Accepted Answer

$$-40.0^\circ\mathrm{F}$$

Question 17

Which of the following is NOT a base SI unit?

Accepted Answer

Liter ($$\mathrm{L})$$

Question 18

A student needs to convert $$5.00\ \mathrm{km} to $$meters. What is the correct answer and which prefix multiplier is used?

Accepted Answer

$$5.00 	imes 10^3$\ \mathrm{m}$$; kilo-

Question 19

Which of the following best describes the Kelvin scale?

Accepted Answer

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

Question 20

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm}^3. If $$you have a gold bar with a volume of $$10.0\ \mathrm{cm}^3$$, what is its mass?

Accepted Answer

$$193\ \mathrm{g}$$

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

Guida di studio - Domande di pratica

Study guide - Flashcard