Question 1

Which statement best describes the Law of Multiple Proportions?

Accepted Answer

When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in the ratio of small whole numbers.

Question 2

Which experiment led to the discovery of the electron and what was the key observation?

Accepted Answer

J.J. Thomson's cathode ray tube experiment; cathode rays were deflected by electric and magnetic fields, indicating they were negatively charged particles.

Question 3

A neutral atom of $$^{13}C$$ has how many protons, neutrons, and electrons?

Accepted Answer

6 protons, 7 neutrons, 6 electrons

Question 4

Which of the following is the correct empirical formula for glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$CH_2O$$

Question 5

Which statement about isotopes is correct?

Accepted Answer

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

Question 6

What is the formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$$MgCl_2$$

Question 7

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 8

Which of the following ions is a polyatomic ion?

Accepted Answer

$$NH_4$$^+$$

Question 9

Which statement about the periodic table is correct?

Accepted Answer

Elements are arranged in order of increasing atomic number.

Question 10

Which of the following is a diatomic molecule found naturally?

Accepted Answer

$$O_2$$

Question 11

What is the correct name for the ionic compound $$Fe_2O_3$$?

Accepted Answer

Iron(III) oxide

Question 12

Which of the following statements about subatomic particles is true?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons are found outside the nucleus.

Question 13

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

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 14

Which acid is named hydrofluoric acid?

Accepted Answer

$$HF$$

Question 15

What is the average atomic mass (atomic weight) of an element with two isotopes: 60% $$^{63}X ($$mass = 62.93 amu) and 40% $$^{65}X ($$mass = 64.93 amu)?

Accepted Answer

$$63.53$$ amu

Question 16

Which of the following is a correct statement about the nuclear model of the atom proposed by Rutherford?

Accepted Answer

Most of the atom's mass is concentrated in a small, dense nucleus.

Question 17

Which of the following is the correct name for $$Ag_3N$$?

Accepted Answer

Silver nitride

Question 18

Which of the following is the correct formula for the dichromate ion?

Accepted Answer

$$Cr_2O_7$$^{2-}$$

Question 19

Which of the following is a property of metals?

Accepted Answer

They conduct heat and electricity.

Question 20

Which prefix is used in binary molecular compound nomenclature to indicate five atoms?

Accepted Answer

Penta-

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

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