Question 1

Which drawing best accounts for the polarity of H$$_2O $$and its bond polarities?

Accepted Answer

Drawing (4)

Question 2

Which is the longest bond among the following?

Accepted Answer

N—N

Question 3

Place the following in order of increasing bond length: NO$$_2^-$$, NO$$_3^-$$, NO.

Accepted Answer

NO \u003c NO$$_2^-$$ \u003c NO$$_3^-$$

Question 4

Identify the strongest bond.

Accepted Answer

Triple covalent bond

Question 5

Place the following in order of decreasing bond length: H–F, H–I, H–Br, H–Cl.

Accepted Answer

H–I \u003e H–Br \u003e H–Cl \u003e H–F

Question 6

Define electronegativity.

Accepted Answer

The ability of an atom to attract electrons to itself in a chemical bond

Question 7

Using periodic trends, place the following bonds in order of increasing ionic character: Si–P, Si–Cl, Si–S.

Accepted Answer

Si–P \u003c Si–Cl \u003c Si–S

Question 8

Place the following elements in order of increasing electronegativity: V, Fr, C.

Accepted Answer

Fr \u003c V \u003c C

Question 9

The compound CCl$$_4$$ contains:

Accepted Answer

Polar covalent bonds, with partial negative charges on the Cl atoms

Question 10

The compound ICl contains:

Accepted Answer

Polar covalent bonds with partial negative charges on the Cl atoms

Question 11

Place the following elements in order of decreasing electronegativity: C, N, Sn.

Accepted Answer

N \u003e C \u003e Sn

Question 12

Estimate $$\Delta H^\circ_{rxn}$$ for the reaction: 2 Br$$_2(l) + C$_2H$_2(g$$) $$\rightarrow C$_2H$_2Br$_4(l). $$Given bond energies: Br–Br: 193, C≡C: 837, C–C: 347, C–Br: 276, C–H: 414.

Accepted Answer

$$-324 kJ$$

Question 13

Estimate $$\Delta H^\circ_{rxn}$$ for: CH$$_3OH(l) + 2 O$_2(g$$) $$\rightarrow CO$_2(g) + 2 H$_2O(g). $$Given bond energies: C–H: 414, C–O: 360, C=O: 799, O=O: 498, O–H: 464.

Accepted Answer

$$-486 kJ$$

Question 14

Which of the following contains an atom that does not obey the octet rule?

Accepted Answer

LiBr

Question 15

A valid Lewis structure of which of the following cannot be drawn without violating the octet rule?

Accepted Answer

PO$$_4$$^{3-}$$

Question 16

Which describes the bonding in CO$$_3$$^{2-}$$?

Accepted Answer

Two C–O single and one C=O double bond

Question 17

How many bonding pairs and lone pairs are in H$$_2O$_2$$?

Accepted Answer

3 bonding, 4 lone

Question 18

Which element can form compounds with an expanded octet?

Accepted Answer

As

Question 19

How many lone pairs are on Sb in SbF$$_3$$?

Accepted Answer

1

Polarity and Molecular Dipole Moments in Water (H₂O)

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