Question 1

Which of the following elements is most likely to form three covalent bonds and one lone pair in a neutral molecule, according to the octet rule?

Accepted Answer

Nitrogen

Question 2

How many total valence electrons are present in the carbonate ion, $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

$$24$$

Question 3

Which of the following molecules has a linear geometry around its central atom?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 4

What is the correct Lewis structure for $$\mathrm{NH_4$^+} ($$ammonium ion)?

Accepted Answer

Nitrogen with four bonds and no lone pairs

Question 5

Which of the following molecules is nonpolar due to its molecular symmetry?

Accepted Answer

$$\mathrm{CH_4$}$$

Question 6

Which of the following compounds contains an ionic bond?

Accepted Answer

$$\mathrm{MgO}$$

Question 7

Which of the following changes of state is exothermic?

Accepted Answer

Condensation

Question 8

Which intermolecular force is dominant in $$\mathrm{NH_3$} ($$ammonia)?

Accepted Answer

Hydrogen bonding

Question 9

Which of the following molecules will NOT dissolve significantly in water?

Accepted Answer

$$\mathrm{CH_4$}$$

Question 10

A red blood cell is placed in seawater (osmolarity $$1.0) $$while normal plasma has an osmolarity of $$0.3. $$What will happen to the cell?

Accepted Answer

Seawater is hypertonic, and RBCs will shrivel.

Question 11

Which of the following molecules can act as a hydrogen bond donor and acceptor?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 12

Which of the following best explains why $$\mathrm{Br_2$} is a $$liquid at room temperature while $$\mathrm{Cl_2$} is a $$gas?

Accepted Answer

$$\mathrm{Br_2$}$$ has stronger London dispersion forces due to its larger size.

Question 13

Which of the following solutions has the greatest osmolarity, assuming equal concentrations?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 14

Which of the following is a weak electrolyte in water?

Accepted Answer

Acetic acid ($$\mathrm{CH_3COOH})$$

Question 15

Which of the following best describes the geometry around the central atom in $$\mathrm{NH_3$}$$?

Accepted Answer

Tetrahedral (electron geometry)

Question 16

Which of the following molecules is polar due to its asymmetric shape?

Accepted Answer

$$\mathrm{H_2O}$$

Question 17

Which of the following statements about hydrogen bonding is TRUE?

Accepted Answer

Hydrogen bonds require hydrogen attached to N, O, or F.

Question 18

Which of the following best describes the process of osmosis?

Accepted Answer

Solvent moves across a semipermeable membrane.

Question 19

Which of the following molecules has the greatest number of hydrogen bond acceptors?

Accepted Answer

$$\mathrm{H_2O}$$

Question 20

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity in water but not as a solid?

Accepted Answer

Ions are free to move in solution but fixed in the solid.

Molecular Structure, Bonding, and Interactions with Water: GOB Chemistry Study Notes

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