Loose Leaf for General, Organic, and Biochemistry: Exam 2 Flashcards

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

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

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

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

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

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. PO^2-

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

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

What is the formula of the ionic compound sodium carbonate?

a. NaCO₂

b. Na₂CO₂

c. Na₂CO₃

d. Na(CO₃)₂

e. Na₃CO₃

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

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

How many nonbonding electrons are in CH₄?

a. 0

b. 1

c. 2

d. 3

e. 8

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

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

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

What is the formula of the compound sulfur trioxide?

a. S₃O

b. SO₃

c. S(O₂)₃

d. S₃O₂

e. S₃O^2-

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

a. 5

b. 6

c. 7

d. 8

e. 10

Which element has the greatest electronegativity?

a. Si

b. P

c. Cl

d. Ar

e. Br

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

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

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

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

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

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

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

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

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

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

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

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

Classify the following reaction:

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

a. precipitation

b. acid-base

c. oxidation-reduction

d. decomposition

e. combustion

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

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

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

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

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

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

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

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