Question 1

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 2

A neutral atom of bromine-81 ($$^{81}\mathrm{Br}) $$has how many protons, neutrons, and electrons?

Accepted Answer

35 protons, 46 neutrons, 35 electrons

Question 3

Which of the following best describes the difference between a molecular formula and an empirical formula?

Accepted Answer

A molecular formula gives the exact number of atoms of each element in a molecule, while an empirical formula gives the simplest whole-number ratio of atoms.

Question 4

Calculate the average atomic mass of carbon given the following data: $$^{12}\mathrm{C} (98.93$$%, 12.0000 amu) and $$^{13}\mathrm{C} (1.07$$%, 13.0034 amu).

Accepted Answer

$$12.01\ \mathrm{amu}$$

Question 5

Which of the following pairs of elements would you expect to have the most similar chemical properties?

Accepted Answer

Mg and Ca

Question 6

What is the correct formula for the compound formed between aluminum ions and phosphate ions?

Accepted Answer

$$\mathrm{Al}_2(\mathrm{PO}_4)_3$$

Question 7

Which of the following is a diatomic molecule?

Accepted Answer

$$\mathrm{O}_2$$

Question 8

What is the name of the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 9

Which of the following ions is correctly paired with its name?

Accepted Answer

$$\mathrm{NO}_3^-$$, nitrate ion

Question 10

Which of the following compounds is ionic?

Accepted Answer

$$\mathrm{Na}_2\mathrm{O}$$

Question 11

What is the correct name for $$\mathrm{H}_2\mathrm{SO}_3$$?

Accepted Answer

Sulfurous acid

Question 12

Which of the following best describes a cation?

Accepted Answer

A positively charged ion formed when an atom loses electrons

Question 13

What is the empirical formula for a compound with the molecular formula $$\mathrm{C}_6\mathrm{H}_{12}$$?

Accepted Answer

$$\mathrm{CH}_2$$

Question 14

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 15

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 16

What is the correct formula for magnesium nitride?

Accepted Answer

$$\mathrm{Mg}_3\mathrm{N}_2$$

Question 17

Which of the following is the correct name for $$\mathrm{C}_2\mathrm{H}_5\mathrm{OH}$$?

Accepted Answer

Ethanol

Question 18

Which of the following acids is correctly named?

Accepted Answer

$$\mathrm{HNO}_3$$, nitric acid

Question 19

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

Accepted Answer

$$\mathrm{(NH}_4)_2\mathrm{Cr}_2\mathrm{O}_7$$

Question 20

Which of the following best describes a polyatomic ion?

Accepted Answer

A charged species composed of two or more atoms covalently bonded

Atomic Structure, Periodic Table, and Chemical Nomenclature: General Chemistry Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards