Exam 2

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1

Which statement about compounds is FALSE?

a. compounds consist of atoms of two or more different elements that are chemically bonded together

b. the elements in a compound cannot be separated or recovered by a physical process

c. ionic compounds are composed of cations and anions

d. covalent compounds are composed of metals and nonmetals

e. intermolecular forces are attractive forces between molecules of a compound, and are responsible for the compound's physical properties

d. covalent compounds are composed of metals and nonmetals

2

A covalent bond involves which of the following?

a. sharing of electrons between two atoms

b. transfer of electrons between two atoms

c. donation of protons from one atom to another

d. electrostatic attraction between opposite charges

e. sharing of protons between two atoms

a. sharing of electrons between two atoms

3

What is the formula of the ionic compound formed when ions of calcium and nitrogen combine?

a. CaN

b. CaN2

c. Ca2N

d. Ca3N2

e. Ca2N3

d. Ca3N2

4

Emergency treatment of cardiac arrest victims sometimes involves injection of a calcium chloride (CaCl2) solution directly into the heart muscle. Which statement about the compound CaCl2 is FALSE?

a. this compound is an ionic compound

b. the cation in this compound is Ca2+

c. the anion in this compound is Cl2 -

d. there are two chloride ions in this compound

e. the net charge on this compound is zero

c. the anion in this compound is Cl2 -

5

At what temperature is a liquid converted into a gas?

a. the boiling point of the liquid

b. the combustion point of the liquid

c. the flash point of the liquid

d. the condensation point of the liquid

e. 100 Celsius

a. the boiling point of the liquid

6

The polyatomic ion known as the diphosphate ion is an important intermediate formed in metabolic processes. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which of the following correctly represents the symbol for the diphosphate ion?

a. P2O7 4-

b. P2O7 14-

c. PO4+

d. P 2O7 2-

e. PO2-

a. P2O7 4-

7

Which statement about general bonding characteristics is FALSE?

a. bond energy is the amount of energy required to break a bond holding two atoms together

b. bond length is the distance of separation of two nuclei in a covalent bond

c. triple bonds have higher bond energies than double bonds

d. single bonds are easier to break than double bonds

e. a triple bond is longer than a single bond

e. a triple bond is longer than a single bond

8

What statement about the ammonia molecule, NH3, is FALSE?

a. the molecule contains three polar bonds

b. the molecule itself is not polar

c. the molecule has a trigonal pyramidal shape

d. the nitrogen atom has one nonbonding pair of electrons

e. the pull of the electrons in the N-H bonds is toward the nitrogen atom

b. the molecule itself is not polar

9

What is the formula of the ionic compound sodium carbonate?

a. NaCO2

b. Na2CO2

c. Na2CO3

d. Na(CO3)2

e. Na3CO3

c. Na2CO3

10

What is the name of Fe2(SO4)3 in the Stock system?

a. iron monosulfuric acid

b. iron (II) sulfate

c. iron (III) sulfate

d. iron trisulfate

e. iron (II) trisulfate

c. iron (III) sulfate

11

A double bond between two atoms, A and B, ___________.

a. is longer than a single bond between the same two atoms

b. has a lower bong energy than a single bond between the same two atoms

c. arises when two electrons are transferred from A to B

d. consists of two electrons shared between A and B

e. consists of four electrons shared between A and B

e. consists of four electrons shared between A and B

12

How many nonbonding electrons are in CH4?

a. 0

b. 1

c. 2

d. 3

e. 8

a. 0

13

What is the proper name for Mg(CN)2?

a. Manganese carbon nitride

b. Manganese dicyanide

c. Magnesium dicarbon dinitride

d. Magnesium (II) dicyanide

e. Magnesium cyanide

e. Magnesium cyanide

14

What region on the periodic table are elements with the lowest electronegativity values found?

a. upper right corner

b. bottom right corner

c. upper left corner

d. bottom left corner

e. middle

d. bottom left corner

15

What kind of bond results when electron transfer occurs between atoms of two different elements?

a. ionic

b. covalent

c. nonpolar

d. single

e. double

a. ionic

16

What is the formula of the compound sulfur trioxide?

a. S3O

b. SO3

c. S(O2)3

d. S3O2

e. S3O2-

b. SO3

17

How many dots are present in the Lewis symbol for the fluorine atom?

a. 5

b. 6

c. 7

d. 8

e. 10

c. 7

18

Which element has the greatest electronegativity?

a. Si

b. P

c. Cl

d. Ar

e. Br

c. Cl

19

Draw the Lewis structures of F2, O2 and N2. Which statement is true?

a. all three molecules have single bond between the atoms

b. both O2 and N2 have double bonds connecting the atoms

c. Fluorine has the shortest bond between the two atoms

d. the bond between the nitrogen atoms in N2 is stronger than the bond in F2 and O2

e. all three molecules have triple bonds between the atoms

d. the bond between the nitrogen atoms in N2 is stronger than the bond in F2 and O2

20

A sample of aluminum contains 2.91 x 1022 atoms of aluminum. What is the mass of this sample?

a. 0.767 g

b. 1.30 g

c. 558 g

d. 1.08 x 1021 g

e. 7.85 x 1023 g

b. 1.30 g

21

How is the eaction shown below best classified?

Ca(s)+2HCl(aq)---> CaCl2(g)+H2(g)

a. decomposition

b. combination

c. single-replacement

d. double-replacement

e. precipitation

c. single-replacement

22

How is the reaction shown below best classified?

2NaCl(s)+F2(g)--->2NaF(s)+Cl2(g)

a. decomposition

b. combination

c. single-replacement

d. double-replacement

e. precipitation

c. single-replacement

23

What is the mass of a 0.150 mole sample of sulfur?

a. 5.17 g

b. 4.68 g

c. 214 g

d. 0.208 g

e. 4.81 g

e. 4.81 g

24

Lithium oxide can be produced by the reaction shown below. If a manufacturing company wants to make 25.0 g of Li2O, what mass of Li is necessary?

4Li(s)+O2(g)--->2Li2O(s)

a. 0.0861 g Li

b. 2.903 g Li

c. 11.6 g Li

d. 12.5 g Li

e. 23.2 g Li

c. 11.6 g Li

25

To convert a given number of moles into the number of atoms, one would multiply by which of the following factors?

a. 6.022 x 1023 atoms/1 mol

b. 1 mol/6.022 x 1023 atoms

c. 1.66 x 10-24 atoms/1 mol

d. 1 mol/1.66 x 10-24 atoms

e. molar mass

a. 6.022 x 1023 atoms/1 mol

26

The average mass of one atom of copper is 63.55 amu. What is the mass of Avogadro's number of atoms?

a. 3.827 x 1025 amu

b. 63.55 g

c. 3.827 x 1025 g

d. 63.55 atoms

e. 63.55 formula units

b. 63.55 g

27

What is the mass of one mole of carbon atoms?

a. 6.022 g

b. 12.01 g

c. 7.232 g

d. 6.022 x 1023 g

e. 7.232 x 1024 g

b. 12.01 g

28

What is the mass of 3.01 mol of sulfur atoms?

a. 1.81 x 1024 g

b. 32.06 g

c. 3.01 g

d. 0.150 g

e. 96.5 g

e. 96.5 g

29

How many atoms of sulfur are present in a 155 g sample of sulfur?

a. 2.91 x 1024 atoms

b. 6.02 x 1023 atoms

c. 3.01 x 1023 atoms

d. 2.91 x 1023 atoms

e. 2.01 x 1023 atoms

a. 2.91 x 1024 atoms

30

Methanol (CH3OH) is the fuel used by race cars in the Indianapolis 500. It burns in the engine according to the equation below. How many moles of oxygen gas are necessary to react completely with 425 moles of methanol?

2CH3OH(l)+3O2(g)--->2CO2(g)+4H2O(g)

a. 3 mol

b. 255 mol

c. 283 mol

d. 638 mol

e. 1275 mol

d. 638 mol

31

Classify the following reaction:

H2SO4(aq)+2KOH(aq)--->K2SO4(aq)+2H2O(aq)

a. precipitation

b. acid-base

c. oxidation-reduction

d. decomposition

e. combustion

b. acid-base

32

Choose the best classification of the reaction represented by the following equation:

Na2SO4(aq)+Ba(OH)2(aq)--->BaSO4(s)+2NaOH(aq)

a. decomposition

b. combination

c. single-replacement

d. double-replacement

e. none of the choices are correct

d. double-replacement

33

Choose the best classification of the reaction represented by the following equation:

Zn(s)+CuSO4(aq)--->ZnSO4(aq)+Cu(s)

a. single-replacement

b. double-replacement

c. combination

d. decomposition

e. acid-base

a. single-replacement

34

What is the mass of 4.35 moles of aluminum?

a. 0.163 g

b. 117 g

c. 2.62 x 1024 g

d. 9.78 x 1022 g

e. 27.8 g

b. 117 g

35

Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2.

a. 9.77 mol

b. 0.115 mol

c. 17.4 mol

d. 0.0631 mol

e. 0.0570 mol

e. 0.0570 mol

36

What are the formulas for the products that are expected in the double-replacement reaction shown below?

FeSO4(aq)+NaOH(aq)--->

a. FeOH and SO4Na

b. FeNa and SO4OH

c. Fe(OH)2 and Na2SO4

d. FeOH and NaSO4

e. FeOH2 and Na2SO4

c. Fe(OH)2 and Na2SO4

37

Consider the hypothetical reaction: 3A2+2B--->C+2D

How many moles of D can be formed from 5.0 mol of A2 and excess B?

a. 1.7 mol

b. 3.3 mol

c. 6.7 mol

d. 7.5 mol

e. 10. mol

b. 3.3 mol

38

How many iron atoms are present in 0.552 mol of iron?

a. 2.798 x 1024

b. 6.02 x 1023

c. 27.98

d. 3.32 x 1023

e. 55.85

d. 3.32 x 1023

39

Diamond is a pure form of the element carbon. If a 2 carat diamond has a mass of 0.396 g, how many carbon atoms are contained in this diamond?

a. 3.97 x 1022 atoms

b. 6.58 x 10-25 atoms

c. 1.99 x 1023 atoms

d. 1.99 x 1022 atoms

e. 2.38 x 1023 atoms

d. 1.99 x 1022 atoms