Question 1

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To achieve a noble gas electron configuration and lower their potential energy

Question 2

Which of the following compounds contains an ionic bond?

Accepted Answer

NaCl

Question 3

What is the correct formula unit for a compound formed between Ba$$^{2+}$$ and NO$$_3^-$$?

Accepted Answer

$$\mathrm{Ba(NO_3$)_2}$$

Question 4

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity decreases down a group and increases across a period.

Question 5

Given the electronegativity difference ($$\Delta EN) $$between two atoms is 2.1, what type of bond is most likely formed?

Accepted Answer

Ionic

Question 6

Which of the following is the correct name for the compound $$\mathrm{$$PBr_3$$}$$?

Accepted Answer

Phosphorus tribromide

Question 7

Which of the following best describes the structure shown in the sixth image (green and blue spheres in a cubic arrangement)?

Accepted Answer

A crystalline ionic solid with a 3D array of ions

Question 8

What is the correct name for $$\mathrm{$$HNO_2$$(aq)}$$ according to Arrhenius acid nomenclature?

Accepted Answer

Nitrous acid

Question 9

Which of the following elements naturally exists as a diatomic molecule at room temperature?

Accepted Answer

Nitrogen

Question 10

What is the correct formula for the compound formed between $$\mathrm{Al$$^{3+}$$}$$ and $$\mathrm{F^-}$$?

Accepted Answer

$$\mathrm{$$AlF_3$$}$$

Question 11

Which of the following best describes why ionic compounds are brittle?

Accepted Answer

Electrostatic repulsion occurs when like charges are forced together.

Question 12

Which of the following is the correct name for $$\mathrm{$$CrO_3$$}$$?

Accepted Answer

Chromium(VI) oxide

Question 13

Which of the following compounds is most likely to be a gas at room temperature?

Accepted Answer

CO

Question 14

What is the correct formula for the compound formed between $$\mathrm{NH_4$^+}$$ and $$\mathrm{PO_4$^{3-}}$$?

Accepted Answer

$$\mathrm{(NH_4$)_3PO_4}$$

Question 15

Which of the following is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 16

Which of the following best describes the difference between a formula unit and a molecule?

Accepted Answer

A formula unit is the simplest ratio of ions in an ionic compound, while a molecule is a discrete entity formed by covalent bonds.

Question 17

Which of the following is the correct name for $$\mathrm{H_2CO_3(aq)}$$?

Accepted Answer

Carbonic acid

Question 18

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases due to increased nuclear charge.

Question 19

Which of the following is the correct formula for tin(II) fluoride?

Accepted Answer

$$\mathrm{$$SnF_2$$}$$

Question 20

Which of the following best explains why ionic compounds conduct electricity in solution but not as solids?

Accepted Answer

Ions are free to move in solution, allowing electrical conductivity, but are fixed in place in the solid state.

Molecules and Compounds: Structure, Bonding, and Nomenclature

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