Question 1

Which of the following best describes an intensive property, and which is an example of it?

Accepted Answer

A property that does not depend on the amount of substance present; for example, density.

Question 2

A student measures the mass of a gold coin three times and gets values of 19.30 g, 19.32 g, and 19.31 g. The actual mass is 19.32 g. Which statement best describes the measurements?

Accepted Answer

The measurements are both precise and accurate.

Question 3

Which of the following is a chemical change?

Accepted Answer

Rusting of an iron nail.

Question 4

A sample of ethanol has a mass of 15.8 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$0.790\ \mathrm{g/mL}$$

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Air in a classroom.

Question 6

Convert $$355\ \mathrm{mL} ($$the volume of a can of soda) to liters.

Accepted Answer

$$0.355\ \mathrm{L}$$

Question 7

Which of the following statements about SI units is correct?

Accepted Answer

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

Question 8

A cube has sides of length $$2.00\ \mathrm{cm}. $$What is its volume in $$\mathrm{mL}$$?

Accepted Answer

$$8.00\ \mathrm{mL}$$

Question 9

Which of the following is an example of a compound?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 10

A student needs to convert $$8.00\ \mathrm{m} to $$inches. Given $$1\ \mathrm{in.} = 2.54\ \mathrm{cm}$$ and $$1\ \mathrm{cm} = 10$$^{-2}$$\ \mathrm{m}$$, what is the correct answer?

Accepted Answer

$$315\ \mathrm{in.}$$

Question 11

Which of the following is an extensive property?

Accepted Answer

Mass

Question 12

Which of the following best describes the difference between a pure substance and a mixture?

Accepted Answer

A mixture has a variable composition, while a pure substance has a fixed composition.

Question 13

A sample of table salt has a mass of $$10.0\ \mathrm{g}$$ and a volume of $$4.63\ \mathrm{cm}^3. $$What is its density?

Accepted Answer

$$2.16\ \mathrm{g/cm}^3$$

Question 14

Which of the following is an example of a physical change?

Accepted Answer

Sublimation of dry ice (solid $$\mathrm{CO}_2) to $$gas.

Question 15

How many significant figures are in the measurement $$0.03500\ \mathrm{g}$$?

Accepted Answer

Four

Question 16

Which of the following is the correct conversion from Celsius to Kelvin for a temperature of $$25.0\ ^\circ\mathrm{C}$$?

Accepted Answer

$$K = 25.0 + 273.15 = 298.15\ \mathrm{K}$$

Question 17

Which of the following is an exact number?

Accepted Answer

The number of centimeters in a meter.

Question 18

A student adds $$2.47$$ and $$3.1. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$5.6$$

Question 19

Which of the following is the correct SI prefix for $$10^{-6}$$?

Accepted Answer

micro-

Question 20

A laboratory balance gives a reading of $$20600\ \mathrm{g}. $$How many significant figures does this measurement have?

Accepted Answer

Three

General Chemistry I: Chapter 1 – Matter, Energy, and Measurement

Guida di studio - Domande di pratica

Study guide - Flashcard