Question 1

Which of the following best describes a chemical property?

Accepted Answer

Ability of a substance to react with oxygen

Question 2

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

Accepted Answer

Boiling of water

Question 3

Which statement about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 4

A sample contains 3.0 moles of sodium chloride (NaCl). How many formula units are present in the sample? (Use Avogadro's number: $$6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.81 	imes 10$$^{24}$$

Question 5

Which of the following elements is most likely to form a cation?

Accepted Answer

Sodium

Question 6

Which of the following best describes the arrangement of elements in the modern periodic table?

Accepted Answer

By increasing atomic number

Question 7

Which of the following is a correct electron configuration for magnesium ($$Z=12$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$

Question 8

Which of the following statements about ionic compounds is correct?

Accepted Answer

They are formed by the transfer of electrons from metals to nonmetals.

Question 9

A patient is given 0.50 mol of glucose ($$C_6H_{12}O_6$) intravenously. What is the mass of glucose administered? (Molar mass of C_6H$$_{12}$$O_6 = 180$$ \ g/mol$$)

Accepted Answer

$$90 \ g$$

Question 10

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

Question 11

Which of the following is a chemical change that occurs in the human body?

Accepted Answer

Digestion of carbohydrates

Question 12

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Question 13

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Question 14

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$CH_2O$$

Question 15

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

Accepted Answer

A mixture can be separated by physical means, while a compound cannot.

Question 16

Which of the following is the correct name for $$Fe_2O_3$$?

Accepted Answer

Iron(III) oxide

Question 17

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = $$58.44 \ g/mol)$$

Accepted Answer

$$0.342 \ M$$

Question 18

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 19

Which of the following is a correct Lewis structure for water ($$H_2O$$)?

Accepted Answer

O atom with two single bonds to H atoms and two lone pairs on O

CHEM 231 Exam 1 Study Guide: Foundations of Chemistry

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