Chemistry Test 2

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For the elements Cs, F, and Cl, the order of increasing electronegativity is

Cs<Cl<F

In which pair do both compounds exhibit predominantly ionic bonding? a. PCl₃ b. Na₂SO₃ c. KI and O₃ d. BaF₂ and H₂O e. CsCl and MgO

CsCl and MgO

Which of the following molecules contains the shortest C-C bond?

C₂H₂

Which of the following does not contain at least one pi bond?

C₂H₆

True or False: A nonpolar covalent bond results from the unequal sharing of a pair of electrons between atoms in a molecule.

False

True or False: When a metal reacts with a nonmetal a covalent bond is formed.

False, an ionic bond is formed.

Which of the following molecules has a nonlinear structure?

O₃

Lewis structure for acetone, CH₃COH₃

Refer to internet

Which of the following molecules contains a central atom with sp² hybridization?

Refer to paper

Which of the following is not a valid resonance structure for N₃⁻?

Refer to paper answer is a.

Which of the following has a dipole moment?

SO₂

Which of the following bonds would be the most polar without being considered ionic? a. Mg-O b. C-O c. O-O d. Si-O e. N-O

Si-O

As the bond order of a bond increases, the bond energy _____ and the bond length _____.

increase; decreases

The force between two bodies having identical electric charges

is a force of repulsion

In the cyanide ion (CN⁻), the nitrogen has a formal charge of a. -2 b. -1 c. 0 d. 2 e. More info needed

c. 0

Which of the following pairs is incorrect? a. NH₄Br, ammonium bromide b. K₂CO₃, potassium carbonate c. BaPO₄, barium phosphate d. CuCl, copper (I) chloride e. MnO₂, manganese (IV) oxide

c. BaPO₄ Should be Ba₃(PO₄)₂

Which of the following is incorrectly named? a. SO₃²-, sulfite ion b. C₂O₄²⁻, oxalate ion c. PO₄³⁻, phosphate ion d. ClO₃⁻, chlorite ion e. CN⁻, cyanide ion

d. ClO³⁻ Should be named chlorAte ion

All of the following are in aqueous solution. Which is incorrectly named? a. H₂SO₄, sulfuric acid b. H₂CO₃, carbonic acid c. H₃PO₄, phosphoric acid d. HCN, cyanic acid e. HCl, hydrochloric acid

d. HCN Should be named hydrocyanic acid

Which of the following exhibits resonance? a. BH₃ b. SCl₆ c. H₂O d. NO₂ e. At least two of the molecules (A-D) exhibit resonance

d. NO₂

Trigonal bipyramidal hybridization

dsp³ or sp³d

Octahedral hybridization

d²sp³ or sp³d²

Which of the following is incorrectly named? a. Pb (NO₃)₂, lead (II) nitrate b. NH₄ClO₄, ammonium perchlorate c. PO₄³-, phosphate ion d. Mg(OH)₂, magnesium hydroxide e. NO³-, nitrite ion

e. NO³- NitrAte ion

The molecular structure of BrF₆ is:

octahedral

Molecular structure of NCl₃

pyramidal

The molecular structure of NCl₃ is:

pyramidal

molecular structure of SOCl₂

pyramidal

Linear structure hybridization

sp

Trigonal planer hybridization

sp²

What is the hybridization of the carbon atom that is double-bonded to oxygen?

sp²

Give the hybridization for the O in OF₂

sp³

Tetrahedral hybridization

sp³

What is the hybridization of the carbon atom that is bonded to chlorine?

sp³

The molecular structure of BeF₃⁻ is:

trigonal planar

Which of the following types of molecules always has a dipole moment?

trigonal pyramid molecules (three identical bonds)

How many of the atoms are sp hybridized in tetracyanoethylene?{

8

The electron configuration of a particular diatomic species is (refer to paper). What is the bond order for this species?

0.5

The bond angle of H₂SE?

109°

Lewis structure has _ sigma bonds and _ pi bonds.

13, 3

How many of the following molecules possess dipole moments?

2

Cl₂ bond energy= 239 kJ/mol F₂ bond energy= 154 kJ/mol 1/2 Cl₂ (g) + 3/2F₂ (g)→ClF₃ ∆H°= -409 kJ/mol

253 kJ/mol

Number of bonds between two carbon atoms increases, which one decreases?

Bond length

The formula for calcium bisulfate is:

Ca (HSO₄)₂

The formula for potassium dihydrogen phosphate is:

KH₂PO₄

Which of the following has the smallest radius?

Mg²⁺

Which of the following has an incomplete octet in its Lewis structure? a. SO₂ b. ICl c. CO₂ d. F₂ e. NO

NO

Is Aluminim (III) Oxide correct?

No

Is Phosphorus pentoxide, P2O5 correct?

No

Choose the statement that best describes the PbCl₄ molecule in the gas phase?

The bond angles are all about 109°.

Consider the following Lewis structure:

answer is (A) Refer to paper, #28

The molecular structure of OF₂ is:

bent


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