Chemistry Chapter 3

The ammonium ion has the formula NH4+. How many nonbonding electrons must be shown in the Lewis structure of the ammonium ion? a. 0 c. 8 b. 4 d. 9

A.

The preferred name for HCO3- is hydrogen carbonate. What is the common name for this ion? a. bicarbonate c. bicarbide b. dicarbonate d. dicarbide

A.

Which of the following is true about elements which exist as diatomic molecules? a. The bond in the molecule is nonpolar covalent. b. The bond in the molecule is polar covalent. c. The bond in the molecule is ionic. d. The type of bond depends on the specific molecule.

A.

Which of the following molecules is(are) polar? a. H2O c. both of them b. CO2 d. neither of them Which of the following molecules is(are) polar? a. H2O c. both of them b. CO2 d. neither of them

A.

A covalent bond is associated with which of the following? a. interactions between nuclei c. the transfer of electrons b. the sharing of electrons d. all of these

B.

AgCl is a chemical commonly used in photography. What is the correct name for AgCl? a. monosilver monochloride c. silver chlorine b. silver chloride d. silver monochlorine

B.

For which of the following pairs are the atoms most likely to form an ionic bond with each other? a. carbon and oxygen c. chlorine and oxygen b. calcium and chlorine d. sodium and magnesium

B.

Formaldehyde has the chemical formula CH2O. How many electrons must be shown in the Lewis structure of formaldehyde? a. 4 c. 12 b. 8 d. 16

B.

Formaldehyde has the chemical formula CH2O. How many nonbonding electrons must be shown in the Lewis structure of formaldehyde? a. 0 c. 8 b. 4 d. 12

B.

How many bonds does a carbon atom typically form? a. 2 c. 6 b. 4 d. 8

B.

How many nonbonding electrons are present in a molecule of water? a. 2 c. 6 b. 4 d. 8

B.

How many types of chemical bonds exist? (that we had studied) A. 1 B. 2 C. 3 D. 4

B.

In which of the following molecules does the carbon atom have a nearly trigonal planar distribution of electron density? a. C2H2 c. C2H6 b. C2H4 d. none of these

B.

What bond angle is most closely associated with a tetrahedral distribution of electron density? a. 90° c. 120° b. 109.5° d. 180°

B.

What is the correct name for NH4NO3, a compound found in fertilizers? a. ammonia nitrate c. ammonia nitrite b. ammonium nitrate d. ammonium nitrite

B.

What is the name of CS2? a. carbon disulfur c. carbon(IV) sulfide b. carbon sulfide d. carbon disulfide

B.

What is the relationship between the nitrate ion and the nitrite ion? a. The nitrate ion has one less oxygen atom than does the nitrite ion. b. The nitrate ion has one more oxygen atom than does the nitrite ion. c. In addition to having one less oxygen atom than nitrite, nitrate also has a larger negative charge. d. In addition to having one more oxygen atom than nitrite, nitrate also has a larger negative charge.

B.

Which is most likely true for an atom with six valence electrons? a. it will gain one electron c. it will lose one electron b. it will gain two electrons d. it will lose two electrons

B.

Which of the following molecules is best described as having a nearly tetrahedral distribution of electron density? a. BeCl2 c. SnCl2 b. OF2 d. none of these

B.

Which of the following molecules is(are) polar? a. BCl3 c. both of them b. NH3 d. neither of them

B.

A compound used in the treatment of manic depression has the formula Li2CO3. Which of the following is the correct name for this compound? a. dilithium carbonate c. lithium carbonate b. lithium carbon trioxide d. lithium carboxide

C.

Acetylene has the formula C2H2. Which of the following is a correct description of acetylene? a. acetylene has only single bonds c. acetylene has one triple bond b. acetylene has one double bond d. none of these is correct

C.

How many electrons are associated with a double bond? a. 1 c. 4 b. 2 d. 6

C.

In a Lewis structure, which of the following atoms can have more than eight electrons associated with it? a. C c. S b. O d. none of these

C.

The term "limelight" is derived from the old name for calcium oxide. What is the formula of calcium oxide? a. CaO2 c. CaO b. Ca2O d. Ca2O2

C.

The toxic gas hydrogen cyanide has the formula HCN. How many electrons must be shown in the Lewis structure of hydrogen cyanide? a. 2 c. 10 b. 6 d. 12

C.

What bond angle is most closely associated with a trigonal planar distribution of electron density? a. 90° c. 120° b. 109.5° d. 180°

C.

What electronegativity difference is associated with a polar covalent bond? a. exactly 0 c. between 0.5 and 1.9 b. less than 0.5 d. greater than 1.9

C.

What is the correct name for Al2(SO4)3? a. dialuminum trisulfate c. aluminum sulfate b. aluminum trisulfate d. aluminum sulfoxide

C.

What is the correct name for K2HPO4? a. dipotassium hydrogen phosphate c. potassium hydrogen phosphate b. potassium hydrogen phosphoxide d. potassium dihydrogen phosphate

C.

What is the correct name for MgO? a. monomagnesium monoxide c. magnesium oxide b. magnesium monoxide d. magnesium oxygen

C.

What is the formula of the compound formed between the ammonium ion and the carbonate ion? a. NH4CO3 c. (NH4)2CO3 b. NH4(CO3)2 d. (NH4)3CO3

C.

What is the name of NO2? a. nitrogen oxide c. nitrogen dioxide b. nitrogen oxygen d. nitrous oxide

C.

What is the valence shell electron configuration of all the noble gases except for helium? a. ns2 c. ns2np6 b. ns2np3 d. np8

C.

When we name a molecular binary compound which of the following is true? a. The element which has more atoms in the molecule is named first. b. We name the elements in alphabetical order. c. We name the less electronegative element first. d. We name the more electronegative element first.

C.

Which halogen atom is most electronegative? a. bromine c. fluorine b. chlorine d. iodine

C.

Which of the following elements is most likely to gain electrons to become an anion? a. Ar c. Cl b. C d. Fe

C.

Which of the following is the correct formula for dinitrogen pentoxide? a. O2N5 c. N2O5 b. O5N2 d. N5O2

C.

Which of the following is the correct formula for dinitrogen trioxide? a. O2N3 c. N2O3 b. O3N2 d. N3O2

C.

Which of the following is true about a molecule which contains only three bonds which are polar and have the same degree of polarity? a. The molecule will always be polar. b. The molecule will never be polar. c. The molecule will be polar if the electron distribution is tetrahedral. d. none of the above is true

C.

Which of the following molecules is(are) polar? a. CH3Cl c. both of them b. CH2Cl2 d. neither of them

C.

In a Lewis structure, which of the following atoms can have more than eight electrons associated with it? a. C c. O b. N d. none of these

D.

The ammonium ion has the formula NH4+. How many electrons must be shown in the Lewis structure of the ammonium ion? a. 4 c. 8 b. 5 d. 9

D.

What is the correct formula for aluminum oxide? a. AlO c. Al2O b. AlO2 d. Al2O3

D.

Which of the following elements is most electronegative? a. B c. N b. C d. O

D.

Which of the following endings is generally associated with a monatomic anion? a. -ade c. -ic b. -ate d. -ide

D.

Which of the following ions has the same electronic configuration as argon? a. K2+ c. both a. and b. b. Ca+ d. neither a. nor b.

D.

Which of the following is expected to be true in the carbonate ion, CO32-? a. The carbon atom does not have an octet. b. The carbon to oxygen bond lengths are the consistent with single bonds. c. The carbon to oxygen bond lengths are the consistent with double bonds. d. The carbon to oxygen bonds are shorter than single bonds but longer than double bonds.

D.

Which of the following is the correct way to write the formula of the compound formed between the barium ion and the sulfate ion? a. Ba2(SO4)2 c. Ba(SO4)2 b. Ba2SO4 d. BaSO4

D.

Which of the following is the correct way to write the formula of the compound formed between the calcium ion and the sulfate ion? a. Ca2(SO4)2 c. Ca(SO4)2 b. Ca2SO4 d. CaSO4

D.

Which of the following is true for the molecule O=C=S? a. O=C=S is nonpolar because it contains only double bonds. b. O=C=S is nonpolar because it is linear. c. O=C=S is polar because it has a bent shape. d. O=C=S is polar because the polarities of the O=C and C=S do not cancel.

D.

Which of the following occurs when a magnesium atom is converted to Mg2+? a. The magnesium atom gains two electrons and loses two protons. b. The magnesium atom gains two electrons. c. The magnesium atom loses two electrons and two protons.

D.