Q: Copper has two naturally occurring isotopes: $$^{63}Cu (69.1$$%, mass = 62.9 amu) and $$^{65}Cu (30.9$$%, mass = 64.9 amu). What is the atomic weight of copper?

$$(0.691 \times 62.9) + (0.309 \times 64.9) = 63.5$$ amu

Question 1

Which of the following statements best describes Dalton's Law of Constant Composition?

Accepted Answer

A given compound always contains the same relative number and kind of atoms.

Question 2

A neutral atom of phosphorus-31 ($$^{31}P) $$has how many protons, neutrons, and electrons?

Accepted Answer

15 protons, 16 neutrons, 15 electrons

Question 3

Which of the following is the correct empirical formula for hydrogen peroxide?

Accepted Answer

$$HO$$

Question 4

Copper has two naturally occurring isotopes: $$^{63}Cu (69.1$$%, mass = 62.9 amu) and $$^{65}Cu (30.9$$%, mass = 64.9 amu). What is the atomic weight of copper?

Accepted Answer

$$(0.691 	imes 62.9) + (0.309 	imes 64.9) = 63.5$$ amu

Question 5

Which group on the periodic table contains elements that are most likely to form $$1^+$$ ions?

Accepted Answer

Group 1A (Alkali metals)

Question 6

What is the chemical formula for iron(III) chloride?

Accepted Answer

$$FeCl_3$$

Question 7

Which of the following is a correct name for $$Na_2SO_4$$?

Accepted Answer

Sodium sulfate

Question 8

Which statement about isotopes is correct?

Accepted Answer

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

Question 9

What is the correct name for $$HNO_2$$?

Accepted Answer

Nitrous acid

Question 10

Which of the following is the correct formula for magnesium nitride?

Accepted Answer

$$Mg_2N_3$$

Question 11

Which of the following is a molecular formula?

Accepted Answer

$$C_6H_{12}O_6$

Question 12

What is the charge on a sulfur ion in $$Na_2S$$?

Accepted Answer

$$2^-$$

Question 13

Which of the following is the correct name for $$KClO_4$$?

Accepted Answer

Potassium perchlorate

Question 14

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$N_2O_4$$

Question 15

Which of the following is a correct structural formula representation?

Accepted Answer

Shows the order in which atoms are bonded

Question 16

Which of the following is the correct name for $$Ca(NO_3$)_2$$?

Accepted Answer

Calcium nitrate

Question 17

What is the correct formula for barium hydroxide?

Accepted Answer

$$Ba(OH)_2$$

Question 18

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 19

Which of the following is the correct name for $$HClO_3$$?

Accepted Answer

Chloric acid

Question 20

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(NH_4$)_2SO_4$$

Atoms, Molecules, and Ions: Foundations of Chemical Structure and Nomenclature

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