Question 1

Which statement from Dalton's Atomic Theory is still accepted today?

Accepted Answer

Atoms of different elements combine to form compounds in small whole number ratios.

Question 2

Which experiment led to the discovery that the atom is mostly empty space with a dense nucleus?

Accepted Answer

Rutherford's gold foil experiment

Question 3

A neutral atom of sodium ($$\mathrm{Na}) $$has 11 protons and 11 electrons. What is the electron count for a $$\mathrm{Na^+}$$ ion?

Accepted Answer

10 electrons

Question 4

Which of the following correctly describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 5

Given an isotope with 28 protons and 32 neutrons, what is its mass number ($$A$$)?

Accepted Answer

$$A = 60$$

Question 6

Which of the following ions has more electrons than protons?

Accepted Answer

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

Question 7

What is the correct formula for calcium bromide?

Accepted Answer

$$\mathrm{$$CaBr_2$$}$$

Question 8

Which of the following is a binary covalent compound?

Accepted Answer

Carbon dioxide

Question 9

What is the name of the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron (III) oxide

Question 10

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 11

What is the correct name for $$\mathrm{$$HNO_2$$} (aq$$)?

Accepted Answer

Nitrous acid

Question 12

Which of the following statements about valence electrons is TRUE?

Accepted Answer

Valence electrons are the outermost electrons involved in chemical reactions.

Question 13

Which of the following is the correct formula for aluminum carbonate?

Accepted Answer

$$\mathrm{Al_2$(CO_3$)_3}$$

Question 14

What is the charge on the iron cation in iron(II) oxide?

Accepted Answer

$$+2$$

Question 15

Which of the following is a polyatomic ion?

Accepted Answer

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

Question 16

What is the correct name for $$\mathrm{HCl} (aq$$)?

Accepted Answer

Hydrochloric acid

Question 17

Which of the following best describes the plum pudding model of the atom?

Accepted Answer

Electrons are embedded in a positively charged sphere.

Question 18

A certain element has an atomic number $$Z = 17$$ and a mass number $$A = 35. $$How many neutrons does it have?

Accepted Answer

$$18$$

Question 19

Which of the following is the correct name for $$\mathrm{CO_2$}$$?

Accepted Answer

Carbon dioxide

Question 20

Which of the following compounds contains a transition metal with a variable charge?

Accepted Answer

$$\mathrm{CuF}$$

Atoms, Molecules, and Ions: Foundations of Atomic Theory and Chemical Nomenclature

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