$$12.044 \times 10$$^{23}$$ atoms

Question 1

Which of the following best explains why graphite and diamond, both made entirely of carbon atoms, have such different physical properties?

Accepted Answer

The carbon atoms in graphite are arranged in sheets, while in diamond they are bonded in a three-dimensional structure.

Question 2

Which of the following statements about the states of matter is correct?

Accepted Answer

A liquid has a definite volume but takes the shape of its container.

Question 3

A sample of matter is placed in a piston and compressed. The sample's volume decreases significantly. What state of matter is most likely present?

Accepted Answer

Gas

Question 4

Which of the following is a pure substance?

Accepted Answer

Table salt (sodium chloride)

Question 5

Which image best represents a compound?

Accepted Answer

An image showing blue circles and red squares connected together.

Question 6

When water is decomposed by electrolysis, why is the volume of hydrogen gas produced twice that of oxygen gas?

Accepted Answer

Each water molecule contains two hydrogen atoms and one oxygen atom.

Question 7

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 8

Which property is a chemical property?

Accepted Answer

Flammability

Question 9

According to Dalton’s atomic theory, which statement is correct?

Accepted Answer

Atoms of the same element are identical in mass and properties.

Question 10

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 11

How many neutrons are in an atom of $$^{197}\mathrm{Au} ($$gold)? (Atomic number of Au is 79.)

Accepted Answer

$$118$$ neutrons

Question 12

Which of the following is an isotope of carbon?

Accepted Answer

$$^{12}\mathrm{C}$$ and $$^{14}\mathrm{C}$$

Question 13

Which of the following best describes an ion?

Accepted Answer

An atom or molecule that has gained or lost electrons

Question 14

What is the empirical formula for glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$)?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 15

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

Accepted Answer

Elements in the same period have similar chemical properties.

Question 16

A forensic chemist finds a white powder at a crime scene. Which method would best help identify the substance?

Accepted Answer

Comparing its elemental composition to known substances

Question 17

How many atoms are in 2 moles of carbon?

Accepted Answer

$$12.044 	imes 10$$^{23}$$ atoms

Question 18

Which of the following best distinguishes mass from weight?

Accepted Answer

Mass is constant everywhere, weight depends on gravity.

Question 19

Which of the following is the correct balanced equation for the reaction of oxygen with nitrogen monoxide to form nitrogen dioxide?

Accepted Answer

$$\mathrm{O}_2 + 2\mathrm{NO} \rightarrow 2\mathrm{NO}_2$$

Question 20

What is the formula weight (in amu) of water ($$\mathrm{H}_2\mathrm{O}$$)? (Atomic weights: H = 1.0 amu, O = 16.0 amu)

Accepted Answer

$$18.0$$ amu

Atoms, Molecules, and Matter: Foundations of General Chemistry

Study Guide - Practice Questions