Question 1

Which statement is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms are composed of protons, neutrons, and electrons.

Question 2

An atom has 13 protons, 14 neutrons, and 10 electrons. What is the correct symbol for this ion?

Accepted Answer

$$\mathrm{^{27}_{13}Al$$^{3+}$$}$$

Question 3

Which of the following best describes an isotope?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons.

Question 4

Calculate the average atomic mass of an element with two isotopes: 20.0% $$\mathrm{^{10}X} (10.0129 $$amu) and 80.0% $$\mathrm{^{11}X} (11.0093 $$amu).

Accepted Answer

$$10.81$$ amu

Question 5

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 6

What is the empirical formula for a compound with the molecular formula $$\mathrm{C_8H_{18}}$$?

Accepted Answer

$$\mathrm{C_4H_9}$$

Question 7

Which of the following compounds is ionic?

Accepted Answer

$$\mathrm{Na_2O}$$

Question 8

A sample of magnesium contains 78.99% $$\mathrm{^{24}Mg} (23.98504 $$amu), 10.00% $$\mathrm{^{25}Mg} (24.9858 $$amu), and 11.01% $$\mathrm{^{26}Mg} (25.9829 $$amu). What is the average atomic mass?

Accepted Answer

$$24.31$$ amu

Question 9

Which of the following is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 10

Which group in the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 11

What is the formula for the compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 12

Which of the following is a correct chemical formula for a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 13

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 14

Which of the following is a binary acid?

Accepted Answer

$$\mathrm{HCl(aq)}$$

Question 15

What is the charge on the ion formed when a sulfur atom gains two electrons?

Accepted Answer

$$2-$$

Question 16

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

Accepted Answer

$$\mathrm{Ca(H_2PO_4)_2}$$

Question 17

Which of the following is a structural isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

2-methylpropane

Question 18

Which of the following best describes a cation?

Accepted Answer

An atom that has lost one or more electrons

Question 19

Which of the following is the correct name for $$\mathrm{NH_4Cl}$$?

Accepted Answer

Ammonium chloride

Question 20

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

Accepted Answer

$$\mathrm{K_2SO_4}$$

Atoms, Molecules, and Ions: Foundations of General Chemistry

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