final exam

1.

1 point

What is the correct formula for potassium sulfite?

KSO4

K2SO4

K2SO3

P2SO4

2.

1 point

What is the proper name for Fe(NO3)3?

iron (II) nitrate

iron (II) nitrite

iron (III) nitrate

iron (III) nitrite

3.

1 point

How many significant figures should there be in the answer to the following math equation?
23.413 g / (2.15 cm x 1.1 cm x3.73 cm)

4

2

3

5

4.

1 point

Which element has the largest atomic radius? (Refer to the Periodic Table for a clue.)

Rb

Li

Na

K

5.

1 point

What is the coefficient of H2 when the following equation is correctly balanced?
Na(s) + H2O(l) --> NaOH(aq) + H2 (g)

2

1

4

3

6.

1 point

Calculate the number of moles in 38.4 g of C4H6O4.

3.08 mol

38.4 mol

4.53 x 103 mol

0.325 mol

7.

1 point

The proper name for N2O5 is

dinitrogen pentoxide

nitrogen pentoxide

pentaoxygen dinitride

dinitrogen tetroxide

8.

1 point

By international agreement the standard temperature and pressure (STP) for gases is

298.15 K and 760. torr

0°C and 700. torr.

25°C and one atmosphere

273.15 K and 760. torr

9.

1 point

Solubility rules predict that a precipitate will form when mixing 0.1 M aqueous solutions of

K2SO4 and CrCl3

KOH and Ba(NO3)2

NiBr2 and AgNO3

NaI and KBr

10.

1 point

What is the formula of the ionic compound formed between strontium (Sr) and nitrogen (N)?

Sr2N3

Sr3N2

SrN

SrN3

11.

1 point

What is (are) the spectator ion(s) in the following reaction?

2H+(aq) + 2ClO3-(aq) + Sr2+(aq) + 2OH-(aq) --> Sr2+(aq) + 2ClO3-(aq) + 2H2O(l)

Sr2+, OH-

H+

H+, OH-

Sr2+, ClO3-

12.

1 point

The reaction 2KClO3(s) → 2KCl(s) + 3O2(g) is a(n)

combustion reaction

synthesis reaction.

ionic reaction.

decomposition reaction.

13.

1 point

Balancing a chemical equation so that it obeys the law of conservation of matter requires:

Making sure the reactants and products are in the same phase.

Adjusting the coefficients in front of the formulas so there are the same number and type of atom on both sides of the equation

Changing the formulas of the products and reactants

Keeping the total charge the same on both sides of the equation

14.

1 point

A covalent bond is formed when two atoms

are dissociated in aqueous solutions

share one or more bonding electron pairs.

have no non-bonding electron pairs.

share no bonding electron pairs

15.

1 point

What are the products produced when Mg(OH)2 reacts with H3PO4?

No reaction occurs

Mg3(PO4)2 and H3(OH)2

(OH)3PO4 and HMg

Mg3(PO4)2 and H2O

16.

1 point

Calculate the number of moles of oxygen atoms in 32.0 grams of oxygen gas (O2).

2.00 moles

0.50 moles

2.42 moles

1.00 moles

17.

1 point

Determine the freezing point of a 0.25 m solution of glucose in water. (Kf for water is 1.86ºC/m.)

0.46ºC

–0.46ºC

0.93ºC

–0.93ºC

18.

1 point

Isotopes are atoms of the same element that have different

number of neutrons

numbers of protons

numbers of electrons

principal chemical properties

19.

1 point

A sample of nitrogen gas has a volume of 32.4 L at 20 °C. The gas is heated to 220 °C at constant
pressure. What is the final volume of nitrogen?

31.4 L

19.3 L

54.5 L

356 L

20.

1 point

The hydrogen (H) atom can achieve a complete outer shell by

sharing a bonding pair of electrons with another atom.

gaining one electron to form H-.

losing one electron to form H+.

all of the above.

21.

1 point

Which one of the following gases will diffuse the fastest at a given temperature?

SF6

CH4

Ar

NH3

22.

1 point

The correct name for HNO2 is

nitrous acid.

hydronitric acid

nitric acid.

hyponitric acid.

23.

1 point

A small bubble rises from the bottom of a lake, where the temperature and pressure are 4 °C and 3.0
atm, to the water’s surface, where the temperature is 25 °C and pressure is 0.95 atm. Calculate the final
volume of the bubble if its initial volume was 2.1 mL.

0.72 mL

41.4 mL

7.1 mL

6.2 mL

24.

1 point

Liquid nitrogen is used by physicians to burn moles off of skin. Liquid nitrogen boils at boils at 77 K. What is
its boiling point in °C ?

-196°C

350°C

-350°C

-56°C

25.

1 point

How many moles of O2 are required to react with 5.2 moles of methanol, CH3OH?
2CH3OH + 3O2 --> 2CO2 + 4H2O

4.0

3.5

1.8

7.8

26.

1 point

A cube of lead has a volume of 6.61 cm3. Its mass is 75.0 grams. What is its density?

7.41 g/cm3

11.3 g/cm3

3.85 g/cm3

22.6 g/cm3

27.

1 point

What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?

reactivity list

activity series

periodic list

reaction sequence

28.

1 point

What is the molarity of 2850. mL of a solution containing 46.2 grams of NaBr?

0.695 M

0.157 M

0.516 M

0.306 M

29.

1 point

The electron configuration 1s22s22p63s23p6 represents the element __________.

He

Kr

Ne

Ar

30.

1 point

A much sought-after high explosive has the following composition: C, 20.7%; N, 24.1 %; O, 55.2%. What
is its empirical formula?

C2NO2

CNO2

C2N2O6

C4N2O4

31.

1 point

Which one of the following molecular formulas is also an empirical formula?

C6H6O2

H2P4O6

H2O2

C2H6SO

32.

1 point

What volume of 0.2500 M KOH solution contains 16.31 grams of KOH?

872 mL

8.72 mL

165 mL

1165 mL

33.

1 point

The molecular formula for vitamin C is C6H8O6. What is the empirical formula?

CHO

C3H4O3

C2H4O2

CH2O

34.

1 point

Atoms consist principally of what three fundamental particles?

elements, protons, and neutrons

elements, positrons, and neutrons

electrons, protons, and molecules

electrons, protons, and neutrons

35.

1 point

What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?

molar yield

mole ratio

excess yield

percentage yield

36.

1 point

For the reaction SO3 + H2O → H2SO4, calculate the percentage yield if 500. g of sulfur trioxide react with excess water to produce 575 g of sulfuric acid.

82.7%

91.2%

88.3%

93.9%

37.

1 point

The reaction Cl2(g) + 2KBr(aq) → 2KCl(aq) + Br2(l) is a(n)

single replacement reaction

ionic reaction

synthesis reaction

combustion reaction

38.

1 point

In the combustion of butane (C4H10), the amount of carbon dioxide produced by burning 5.80 g
of C4H10 is

2 C4H10 (g) + 13 O2 (g) --> 8 CO2 (g) + 10 H2O (l)

88.0 g

8.80 g

17.6 g

64.8 g

39.

1 point

Glucose has a molecular weight of 180.2 g and an empirical formula CH2O. What is its molecular formula?

C8H4O5

C12H22O11

C10H12O3

C6H12O6

40.

1 point

Which one of the following is an alkaline earth metal?

tin, Sn

potassium, K

magnesium, Mg

iron, Fe

41.

1 point

Which one of the following equations accurately represents the dissociation of Mg(NO3)2?

Mg(NO3)2(aq) --> Mg2+(aq) + 2NO3-(aq)

2NO3-(aq) + Mg2+(aq) --> Mg(NO3)2(aq)

Mg(NO3)2(aq) --> Mg2+(aq) + 2N(aq) + O3-(aq) +

Mg(NO3)2(aq) + 3H2O(l) --> Mg(OH)2(aq) + 2HNO3(aq)

42.

1 point

What is the oxidation number of S in S2O4?

+2

-4

-2

+4

43.

1 point

Calculate the volume occupied by 0.588 g of NH3 at STP, if it behaves ideally.

0.502 L

0.621 L

0.775 L

0.368 L

44.

1 point

Which of the following numbers has 4 significant figures?

0.0430

0.43980

0.0431

0.04309

45.

1 point

Deviations from the Ideal Gas Equation are greater at:

high temperatures and low pressures

high temperatures and high pressures

low temperatures and high pressures

low temperatures and low pressures

46.

1 point

Calculate the number of grams of Al2O3 that could be produced if 2.5 g of aluminum and 2.5 g of oxygen
were allowed to react according to the following balanced equation.
4 Al (s) + 3 O2 (g) --> 2 Al2O3 (s)

7.4 g

4.7 g

10.0 g

9.4 g

47.

1 point

How many significant figures should there be in the answer to the following math equation?
2.834 + 5.71520 + 2.12 + 178.1 + 250.2619

6

5

4

3