Question 1

Which of the following compounds is most likely to have an ionic bond?

Accepted Answer

NaCl

Question 2

Electronegativity is best defined as:

Accepted Answer

The ability of an atom to attract electrons in a covalent bond.

Question 3

Given the electronegativities: $$\chi_{Cl} = 3.0$$, $$\chi_{H} = 2.1$$, what is the bond polarity of HCl?

Accepted Answer

Polar covalent

Question 4

Which molecule has a net dipole moment?

Accepted Answer

NH3

Question 5

What is the correct Lewis structure for $$CO_2$$?

Accepted Answer

O=C=O with each O having two lone pairs

Question 6

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CO2

Question 7

What is the formal charge on the central atom in $$NH_4$$^+$$?

Accepted Answer

0

Question 8

Which statement about resonance structures is correct?

Accepted Answer

Resonance structures show possible locations of electrons, not atoms.

Question 9

Using bond energies, estimate the enthalpy change for the reaction: $$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$. Given: D$$_{C-H} = 414$$ kJ/mol, D$$_{O=O} = 498$$ kJ/mol, D$$_{C=O} = 799$$ kJ/mol, D$$_{O-H} = 463$$ kJ/mol.

Accepted Answer

$$-802 kJ/$$mol

Question 10

Which molecule has a trigonal pyramidal molecular geometry?

Accepted Answer

NH3

Question 11

What is the bond angle in a molecule with tetrahedral geometry?

Accepted Answer

$$109.5^\circ$$

Question 12

Which of the following molecules is expected to be polar?

Accepted Answer

H2O

Question 13

How many lone pairs are on the central atom in $$SF_4$$?

Accepted Answer

1

Question 14

Which of the following best explains why $$CO_2 is $$nonpolar?

Accepted Answer

It has polar bonds but a linear geometry causing dipoles to cancel.

Question 15

What is the electron geometry of $$SF_6$$?

Accepted Answer

Octahedral

Question 16

Which molecule has a seesaw molecular geometry?

Accepted Answer

SF4

Question 17

Which of the following is an exception to the octet rule?

Accepted Answer

SF6

Question 18

What is the molecular geometry of $$XeF_4$$?

Accepted Answer

Square planar

Question 19

Which of the following statements about bond energy is correct?

Accepted Answer

Bond energy is the energy required to break one mole of bonds in gaseous molecules.

Question 20

Which of the following molecules has a T-shaped molecular geometry?

Accepted Answer

ClF3

CHM.CHP.7

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