Question 1

Which of the following statements correctly describes the arrangement of the periodic table?

Accepted Answer

Groups are vertical columns and periods are horizontal rows.

Question 2

Which of the following is NOT a property of metals?

Accepted Answer

Tends to gain electrons in reactions

Question 3

Which family on the periodic table contains elements that are highly reactive with water and have one valence electron?

Accepted Answer

Alkali metals

Question 4

Which of the following best defines a chemical reaction as opposed to a nuclear reaction?

Accepted Answer

A process that involves the rearrangement of electrons to form new substances

Question 5

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

Accepted Answer

Density

Question 6

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 7

A sample of a substance has a definite volume but an indefinite shape. Which state of matter is this?

Accepted Answer

Liquid

Question 8

Which of the following changes is a chemical change?

Accepted Answer

Burning of wood

Question 9

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 10

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

Accepted Answer

Density

Question 11

A student measures the mass of a sample as $$2.3456 g. If $$the answer must be rounded to three significant figures, what is the correct value?

Accepted Answer

$$2.34 g$$

Question 12

Express $$0.004560 in $$scientific notation with the correct number of significant figures.

Accepted Answer

$$4.560 	imes 10$$^{-3}$$

Question 13

A calculation yields the value $$0.05678$$ and must be reported to two significant figures. What is the correct answer?

Accepted Answer

$$0.057$$

Question 14

At standard temperature and pressure (STP), which of the following is true?

Accepted Answer

Temperature is $$0^\circC $$and pressure is $$1$$ atm

Question 15

On a phase diagram, what physical change occurs when a substance moves from the solid region directly to the gas region as temperature increases at low pressure?

Accepted Answer

Sublimation

Question 16

Which of the following best describes a formula unit?

Accepted Answer

The smallest electrically neutral collection of ions in an ionic compound

Question 17

Which of the following scenarios best illustrates a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen

Question 18

A sample of dry ice (solid $$\mathrm{CO_2$}) is $$left on a table at room temperature and disappears without leaving a liquid. Which process has occurred?

Accepted Answer

Sublimation

Question 19

Which of the following best describes the motion and arrangement of particles in a gas?

Accepted Answer

Particles are far apart and move freely in all directions

Question 20

A mixture of sand and salt is best described as:

Accepted Answer

A heterogeneous mixture

General Chemistry Foundations: Periodic Table, Matter, and Measurement

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