chemistry exam #2 practice questions

match the formula in the left column with the molecular shape in the right column 1. CS2 a. bent 2. OF2 b. linear 3. SiF4 c. trigonal pyramidal 4. NH3 d. tetrahedral

1. b 2. a 3. d 4. c

the formula for the binary ionic compound of barium and sulfur is a. BaS b. Ba2S c. BaS2 d. Ba2S3

a. BaS

the formula for copper (I) hydrogen sulfate is a. CuHSO4 b. Cu2HSO3 c. Cu2HSO4 d. Cu(HSO4)2

a. CuHSO4

the formula for sodium hydrogen carbonate is a. NaHCO3 b. Na2HCO3 c. NaH2CO3 d. NaHCO4

a. NaHCO3

which of the following molecules has polar bonds but is nonpolar? a. SiF4 b. Cl2 c. NCl3 d. OF2

a. SiF4

the correct name for Al2S3 is a. aluminum sulfide b. dialuminum trisulfite c. antimony sulfide d. antimony trisulfide

a. aluminum sulfide

the correct name for I2O5 is a. diiodine pentoxide b. diiodopentoxide c. iridium pentoxide d. pentaoxodiiodine

a. diiodine pentoxide

a potassium ion and an argon atom have the same a. electron configuration b. net charge c. nuclear charge d. properties

a. electron configuration

which of the following molecular shapes cannot be formed from the tetrahedral arrangement of the electron sets? a. linear b. bent c. trigonal pyramidal

a. linear

a bond formed when two atoms share one pair of electrons is a. single covalent b. double covalent c. triple covalent d. ionic

a. single covalent

what type of a bond forms when two atoms in group 7A combine to form a diatomic molecule? a. single covalent b. double covalent c. triple covalent d. ionic

a. single covalent

in the lewis formula for SO2, the number of lone pairs of electrons in the outer shell of the central atom is a. 0 b. 1 c. 2 d. 4

b. 1

how many lone pairs of electrons are the in the lewis formula of CF2Cl2? a. 4 b. 12 c. 14 d. 18

b. 12

how many lone pairs of electrons are there in the lewis formula of CF4? a. 4 b. 12 c. 14 d. 16

b. 12

strontium forms a simple (monatomic) ion with a charge of a. 2- b. 2+ c. 4+ d. 8+

b. 2+

oxygen forms a simple (monatomic) ion with a charge of a. 6- b. 2- c. 2+ d. 6+

b. 2-

how many dots surround B in the Lewis dot symbol for boron? a. 2 b. 3 c. 5 d. 9

b. 3

Ca and P react to form Ca3P2, an ionic compound. how many electrons are there in the valence shell of the P3- (phosphide) ion? a. 2 b. 8 c. 10 d. 16

b. 8

how many dots surround Br in the Lewis dot symbol for Br-? a. 1 b. 8 c. 7 d. 9

b. 8

how many unpaired electrons are there on S in SCl2? a. 0 b. 1 c. 2 d. 3

b. 8

how many unshared electrons are there in the lewis formula of H2O2? a. 3 b. 8 c. 14 d. 18

b. 8

which of the following are isoelectronic? a. S2 - and Ar b. Al3 + and Ar c. K and Cl - d. Ne and Ar

b. Al3+ and Ar

which of the following formulas is incorrect? a. AlCl3 b. Al3P2 c. CaS d. Cs2S

b. Al3P2

only one of the following ions is likely to be formed in an ordinary chemical reaction; it is a. Ar3- b. Br- c. K2+ d. S-

b. Br-

in which of the following pairs does carbon have the smallest share of electrons? a. C----C b. C----F c. C----O d. C----N

b. C----F

the formula of the ionic compound formed by lithium and nitrogen is )this is the only stable nitride of an alkali metal) a. LiN b. Li3N c. LiN3 d. Li6N2

b. Li3N

which of the following molecules and polyatomic ion has the smallest O---S---O bond angle? a. SO2 b. SO3^2- c. SO3

b. SO3^2-

which of the following molecular shapes can be formed from the trigonal planar arrangement of the electron sets? a. linear b. bent c. tetrahedral

b. bent

the correct name for N2S4 is a. dinitrogen disulfide b. dinitrogen tetrasulfide c. tetrasulfodinitrogen d. tetrasulfur dinitride

b. dinitrogen tetrasulfide

the bonding between Li+ and F- in lithium fluoride is a. covalent b. ionic c. nonpolar d. polar

b. ionic

the structural difference between a sodium atom and a sodium ion is the the sodium ion has one a. less proton than the sodium atom b. less electron than the sodium atom c. more proton and one less electron than the sodium atom d. more proton than the sodium atom

b. less electron than the sodium atom

the correct name for ZnI2 is a. diiodomonozircon b. zinc iodide c. zincocide chloride d. zirconium iodide

b. zinc iodide

the formula for ammonium dichromate is a. NH4Cr2O7 b. NH4CrO4 c. (NH4)2Cr2O7 d. (NH4)2CrO4

c. (NH4)2Cr2O7

how many pairs of nonbonding electrons does an atom of oxygen have when it forms a double covalent bond with another atom of oxygen? a. 0 b. 1 c. 2 d. 4

c. 2

which group of elements will form stable ions with a 2- charge? a. 2A b. 2B c. 6A d. 8A

c. 6A

which group of elements in the periodic table is characterized by an especially stable electron arrangement? a. 2A b. 2B c. 8A d. 8B

c. 8A

which of the following bonds is the most polar? a. C----Br b. C----Cl c. C----F d. H----H

c. C----F

which of the following molecules is nonpolar? a. HF b. H20 c. CCl4 d. PF3

c. CCl4

which of the following pairs of elements would most likely to form an ionic compound with each other? a. K and Ca b. Se and Cl c. Cs and Se d. Ne and Na

c. Cs and Se

which of the following molecules is polar? a. CF4 b. BF3 c. HCN d. F2

c. HCN

which of the following compounds incorporates a polyatomic ion? a. CO2 b. C6H12O6 c. K2SO3 d. SrBr2

c. K2SO3

the formula of the ionic compound form by magnesium and bromine is a. MgBr b. Mg2Br c. MgBr2 d. Mg2Br3

c. MgBr2

the formula for phosphorus trichloride is a. KCl3 b. K3Cl c. PCl3 d. P3Cl

c. PCl3

the formula for sulfur hexafluoride is a. S5F b. SF c. SF6 d. S6F6

c. SF6

which of the following formulas is correct? a. ZnCl b. Zn2Cl c. ZnCl2 d. Zn2Cl5

c. ZnCl2

when HCl is formed, a. a Cl atom gives one valence electron to an H atom b. an H atom gives one valence electron to a Cl atom c. a pair of valence electrons is shared, one each from the H atom and the Cl atom d. a pair of valence electrons is shard, none from the H atom and two from the Cl atom

c. a pair of valence electrons is shared, one from each the H atom and the Cl atom

the correct name for NH4HCO3 is a. ammonium acetate b. ammonium carbonate c. ammonium hydrogen carbonate d. ammonium cyanide

c. ammonium hydrogen carbonate

for an ionic bond to exist between two atoms, their difference in electronegativity should be a. between 0 and 0.5 b. between 0.5 an 2.0 c. greater than 2.0 d. zero

c. greater than 2.0

in a polar covalent bond, the atom with the partial negative charge is a. less electronegative b. has no electronegativity c. more electronegative d. ionized

c. more electronegative

the bond inBr2 is a. nonpolar double covalent b. ionic c. nonpolar single covalent d. polar triple covalent

c. nonpolar single covalent

the correct name for KCH is a. krypton chloride b. krypton chlorite c. potassium chloride d. potassium chlorine

c. potassium chloride

what is the correct name for NaCN? a. sodium carbonic nitrogen b. sodium cyanite c. sodium cyanide d. sodium monocyanide

c. sodium cyanide

the formula for ammonium phosphate is a. NH4PO3 b. NH4(PO4)2 c. (NH4)2PO4 d. (NH4)3PO4

d. (NH4)3PO4

the lewis formula for CCl4 has a. 0 lone pairs b. 1 double bond c. 4 ionic bonds d. 24 unshared electrons

d. 24 unshared electrons

how many electrons are in the valence shell of the C atom in a methane molecule? a. 2 b. 5 c. 6 d. 8

d. 8

which of the following cations is isoelectronic with S2-? a. Na+ b. Rb+ c. Mg2+ d. Ca2+

d. Ca2+

which of the following molecules is polar? a. H2 b. CH4 c. CO2 d. NH3

d. NH3

which of the following species does not have a triple bond in its lewis formula? a. N2 b. CN- c. CO d. O2

d. O2

in which of the following molecules does hydrogen satisfy the duet rule? a. H2 b. H2O c. CH4 d. all

d. all

how many dots are shown on the Lewis symbol for chloride ion, and what is the ion's charge? a. five dots, no charge b. six dots, positive charge c. seven dots, negative charge d. eight dots, negative charge

d. eight dots, negative charge

the correct name for LiBr is a. bromide lithide b. bromine lithide c. lithium bromium d. lithium bromide

d. lithium bromide

when two H atoms each share an electron with an O atom to form H2O, the bonding is, a. diatomic b. ionic c. nonpolar covalent d. polar covalent

d. polar covalent

carbon monoxide possess a _______ bond. a. polar double covalent b. trisingle ionic c. nonpolar triple covalent d. polar triple covalent

d. polar triple covalent