Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which of the following is an example of a pure substance?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 3

A student measures the mass of a metal block as $$45.67\ \mathrm{g}$$ and its volume as $$16.2\ \mathrm{cm^3$}. $$What is the density of the block, reported with the correct number of significant figures?

Accepted Answer

$$2.8\ \mathrm{g/cm^3$}$$

Question 4

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 5

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by transferring electrons from a metal to a nonmetal.

Question 6

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

Accepted Answer

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

Question 7

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 8

A chemist needs to prepare $$250.0\ \mathrm{mL} of a $$solution. If the solution has a density of $$1.10\ \mathrm{g/mL}$$, what is the mass of the solution in grams?

Accepted Answer

$$275\ \mathrm{g}$$

Question 9

Which of the following statements about atoms is correct?

Accepted Answer

Protons and neutrons are found in the nucleus.

Question 10

A student records the following measurements: $$12.0\ \mathrm{cm}$$, $$12.00\ \mathrm{cm}$$, and $$12\ \mathrm{cm}. $$Which measurement has the greatest number of significant figures?

Accepted Answer

$$12.00\ \mathrm{cm}$$

Question 11

Which of the following is a real-life example of a covalent compound?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 12

A patient receives a medication dissolved in $$50.0\ \mathrm{mL} of $$solution with a density of $$1.20\ \mathrm{g/mL}. $$What is the mass of the solution delivered?

Accepted Answer

$$60\ \mathrm{g}$$

Question 13

Which of the following best explains why the SI unit for mass is the kilogram and not the gram?

Accepted Answer

The kilogram is a larger and more practical unit for scientific measurements.

Question 14

Which of the following is a correct statement about significant figures?

Accepted Answer

All nonzero digits are significant.

Question 15

A sample of gas occupies $$2.50\ \mathrm{L}$$ and has a mass of $$5.00\ \mathrm{g}. $$What is the density of the gas in $$\mathrm{g/L}$$?

Accepted Answer

$$2.00\ \mathrm{g/L}$$

Question 16

Which of the following is a property of a solid state of matter?

Accepted Answer

Particles are close together and vibrate in fixed positions.

Question 17

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element is a pure substance that cannot be broken down by chemical means, while a compound is made of two or more elements chemically combined.

Question 18

Which of the following is the correct formula for calculating density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 19

A gold bar has a mass of $$500.0\ \mathrm{g}$$ and a volume of $$25.0\ \mathrm{cm^3$}. $$What is its density?

Accepted Answer

$$20.0\ \mathrm{g/cm^3$}$$

Question 20

Which of the following best describes the role of electrons in chemical bonding?

Accepted Answer

Electrons are shared or transferred between atoms to form chemical bonds.

Matter and Measurements: Fundamental Concepts in General Chemistry

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