$$25\ \mathrm{cm} \times \frac{1\ \mathrm{m}}{100\ \mathrm{cm}} = 0.25\ \mathrm{m}$$

$$\frac{40.0}{100.0} \times 100\% = 40.0\%$$

Question 1

Which statement best describes the location of most of the mass and most of the volume in an atom?

Accepted Answer

Most of the mass is in the nucleus, and most of the volume is in the electron cloud.

Question 2

A neutral atom of chlorine has an atomic number $$Z = 17$$ and a mass number $$A = 35. $$How many neutrons does it have?

Accepted Answer

18

Question 3

Which of the following is a correct formula for the ionic compound formed between magnesium and nitrate?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 4

Which of the following statements about ionic and covalent compounds is TRUE?

Accepted Answer

Ionic compounds are made of extended structures held together by electrostatic attraction between ions.

Question 5

Which polyatomic ion has the formula $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

Sulfate

Question 6

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following is a diatomic element?

Accepted Answer

Nitrogen ($$\mathrm{N_2$})$$

Question 8

A sample contains a mixture of sodium chloride and water. Which classification best describes this sample?

Accepted Answer

Homogeneous mixture

Question 9

Which of the following ions is a cation?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 10

Which of the following best explains why Roman numerals are used in the names of some ionic compounds?

Accepted Answer

To indicate the charge of Type II cations, which can have multiple possible charges.

Question 11

Which of the following is the correct formula for the compound formed between calcium and phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 12

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons are responsible for chemical bonding and are found in the outermost shell.

Question 13

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

Accepted Answer

Carbon dioxide

Question 14

Which of the following is a correct example of dimensional analysis for converting 25 cm to meters?

Accepted Answer

$$25\ \mathrm{cm} 	imes \frac{1\ \mathrm{m}}{100\ \mathrm{cm}} = 0.25\ \mathrm{m}$$

Question 15

Which of the following is the correct formula for hydrogen carbonate (bicarbonate) ion?

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$

Question 16

Which of the following best describes the attractive force between protons in the nucleus and electrons, and how it relates to ionization energy?

Accepted Answer

The greater the attractive force, the higher the ionization energy.

Question 17

Which of the following is a correct formula for the compound formed between potassium and chromate?

Accepted Answer

$$\mathrm{K_2CrO_4}$$

Question 18

Which of the following is a correct example of a covalent compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 19

Which of the following is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 20

A compound contains 40.0 g of sodium ($$\mathrm{Na}) $$and 60.0 g of chlorine ($$\mathrm{Cl}). $$What is the mass percent of sodium in the compound?

Accepted Answer

$$\frac{40.0}{100.0} 	imes 100\% = 40.0\%$$

Atoms, Ions, Compounds, and Nomenclature: Exam 2 Study Guide

Study Guide - Practice Questions