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Extra-Credit E-homeworkCh3

ANSWERS ARE GIVEN IN BOLD!

Start Date:		19 May 2008 at 01:00 PM
Due Date:		27 May 2008 at 01:00 AM

Student Access after Due Date: Yes. Mark Late

Graded: Yes

EOC Problem 3.52

BeF₂ is

binary molecule.

ionic compound.

EOC Problem 3.54

SnO₂ is

ionic compound.

binary molecule.

Test Bank, Question 1

A compound is

a physical blend of two or more elements.

two or more elements well mixed.

two or more elements combined chemically.

two or more elements carrying a positive charge.

Test Bank, Question 2

Which is an example of an ion?

Na₃PO₄

HO

Na⁺

NaCl

Test Bank, Question 3

Which is the appropriate description ofSr²⁺?

This is an ion with a charge of +2 because there are more electrons than protons.

This is an atom and can be used to form chemical compounds.

This is an atom with a charge of +2 because there are more neutrons than protons.

This is an ion with a charge of +2 because there are two more protons than electrons.

Test Bank, Question 4

Which of the following is a cation?

Na

Br

O^2-

Ca²⁺

Test Bank, Question 5

Which ion has the same number of electrons as the noble gas argon?

Br^-

Ca²⁺

Mg²⁺

F^-

Test Bank, Question 6

How many protons and electrons does Mg²⁺have?

12 protons and 14 electrons

14 protons and 12 electrons

12 protons and 10 electrons

12 protons and 12 electrons

Test Bank, Question 9

How many electrons are in the third energy level of a calcium atom (n = 3)?

8

2

18

20

Test Bank, Question 10

How many valence electrons are in an atom of sulfur?.

8

either 16 or 32

2

6

Test Bank, Question 11

Electron dot structures

are a means of visually representing valence electrons.

show the distribution of the electrons in the energy levels.

show how the inner energy levels fill.

describe how electrons can move from one energy level to another.

Test Bank, Question 13

What is the number of electrons that would be placed around the Al for aluminum when drawing the electron dot structure?

3

13

1

2

Test Bank, Question 14

NO₃^- is the _____ ion.

nitrite

nitrogen trioxide

nitrate

nitrous

Test Bank, Question 15

HPO₄^2- is the _____ ion.

hydrogen phosphate

monophosphate

phosphide

phosphite

Test Bank, Question 19

Which two ions are isoelectronic?

K⁺ and Cl^-

Li⁺ and I^-

Be²⁺ and O^2-

Mg²⁺ and Be²⁺

Test Bank, Question 20

Which symbol is representative of a halide ion?

Fe²⁺

I^-

He

Ne

Test Bank, Question 21

The formation of ions typically occurs when

nonmetal atoms lose electrons and metals gain them.

metal and nonmetal atoms are close together in the number of valence electrons.

nonmetal atoms gain electrons and metal atoms lose them.

metal and nonmetal atoms have the same number of electrons.

Test Bank, Question 23

Which pair of elements cannot combine to form a chemical compound?

Na and Ne

Ca and I

Fe and S

Li and O

Test Bank, Question 24

Calcium chloride has the formula CaCl₂. As an ionic compound it is _____.

more likely a molecular compound

composed of two cations and one anion

composed of one cation and two anions.

held together by means of covalent bonds

Test Bank, Question 26

What is the formula of beryllium sulfide?

Be₂S

Be₃S₂

Be₂S₃

BeS

Test Bank, Question 27

The formula for ammonium chloride is

NH₄Cl

NCl

AlCl₃

AmCl

Test Bank, Question 28

Chose the formula of cobalt(II) nitrate.

Co₂ NO₃

Co(NO₃)₂

CoN

Co_(II)(NO₃)₂

Test Bank, Question 29

The difference between an ionic bond and a covalent bond is that

covalent bonds come about because of a sharing of electrons; ionic bonds don't

ionic bonds commonly occur between two metals and covalent bonds occur between metals and nonmetals

ionic bonds are between atoms that can share electrons; covalent bonds are between atoms that will donate/accept electrons

ionic bonds are between smaller atoms; covalent bonds are between large atoms

Test Bank, Question 30

What is the proper name of the compound FePO₄?

iron(III) phosphide

iron phosphorus tetraoxide

iron(III) phosphate

iron phosphide

Test Bank, Question 32

Copper(II) phosphate has what formula?

Cu₃(PO₄)₂

Cu(II)PO₄

Cu₂(PO₄)₃

Cu₂PO₄

Test Bank, Question 33

Which of the following atom pairs would most likely be connected by an ionic bond?

O and Br

K and Br

S and Br

F and Br

Test Bank, Question 34

Which of the following atom pairs would most likely be connected by a covalent bond?

K and F

O and Cl

Na and O

Na and Cl

Test Bank, Question 35

Nitrogen can have an anion, N^3-. This ion _____.

is the result of the atom gaining three electrons.

can form three ionic bonds.

has eight electrons in the outside orbit.

All of these choices are correct.

Test Bank, Question 36

A compound commonly called trisodium phosphate, Na₃PO₄ , is used to clean grease and other organic materials from concrete surfaces. Calculate the formula weight of this cleaner.

70.2 amu

116.7 amu

118.3 amu

164.0 amu

Test Bank, Question 37

Aluminum sulfate, Al₂(SO₄)₃, can be used as an anti-infective. What is the formula weight of this salt?

342.3 amu

150.1 amu

315.3 amu

75.1 amu

Test Bank, Question 38

What is the mass in grams of 3 moles of calcium carbonate, CaCO₃, a common antacid?

68 grams

100 grams

300 grams

150 grams

Test Bank, Question 39

Calculate the mass of 10 moles of nickel(II) cyanide, Ni(CN)₂.

1694 grams

847 grams

987 grams

1107 grams

Test Bank, Question 41

Ethanol, C₂H₅OH, is found in alcoholic beverages. If a 125-g sample is pure ethanol, how many moles of ethanol are present?

0.419 moles

2.72 moles

46.3 moles

5750 moles

Test Bank, Question 42

A 100-gram sample is found to be pure alanine, CH₃C(NH₂)COOH an amino acid found in proteins. How many moles of alanine are in the sample?

0.9 moles

1.1 moles

890 moles

0.2 moles

Test Bank, Question 43

What is the formula weight of magnesium chloride?

125.9 g/mol

90.4 g/mol

95.3 g/mol

59.8 g/mol

Test Bank, Question 44

What is the formula weight of ammonium oxide?

30.0 g/mol

52.0 g/mol

34.0 g/mol

44.0 g/mol

Test Bank, Question 46

A Roman numeral is used in the name of transition metal ions. That numeral indicates the charge of the ion.

True

False

Test Bank, Question 47

An example of a polyatomic cation is NH₄⁺

False

True

Test Bank, Question 49

Sodium carbonate is an ionic compound whose formula is NaCO₃.

True

False

Test Bank, Question 50

Helium forms an ion with a 2+ charge.

False

True

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