Question 1

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

The electrostatic attraction between oppositely charged ions in a lattice requires a large amount of energy to break.

Question 2

Which of the following is the correct formula for calcium oxide, given the charges of calcium and oxygen ions?

Accepted Answer

CaO

Question 3

A molecule of sulfur hexafluoride ($$\mathrm{SF_6$}) is an $$example of:

Accepted Answer

A molecule in which the central atom exceeds the octet rule

Question 4

Which of the following best describes electronegativity?

Accepted Answer

The ability of an atom in a molecule to attract shared electrons to itself

Question 5

Given the following ions: $$\mathrm{Na^+}$$, $$\mathrm{K^+}$$, $$\mathrm{Ga$$^{3+}$$}$$, $$\mathrm{Ca$$^{2+}$$}$$, which is the largest in size?

Accepted Answer

$$\mathrm{K^+}$$

Question 6

Which of the following is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 7

Which of the following best describes the difference between a space-filling model and a ball-and-stick model of a molecule?

Accepted Answer

A space-filling model shows the relative sizes and orientations of atoms, while a ball-and-stick model emphasizes the connectivity and angles between atoms.

Question 8

Which of the following compounds is named correctly according to the rules for binary covalent compounds?

Accepted Answer

$$\mathrm{CO_2$}$$: Carbon dioxide

Question 9

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

The molecule has a bent shape and oxygen is more electronegative than hydrogen, creating a dipole moment.

Question 10

Which of the following is the correct formula for an alkane with 7 carbon atoms?

Accepted Answer

$$\mathrm{C_7H_{16}}$$

Question 11

A student is asked to write the Lewis structure for $$\mathrm{BH_3$}. $$Which of the following statements is correct?

Accepted Answer

Boron in $$\mathrm{BH_3$}$$ can have less than an octet, with only 6 electrons around it.

Question 12

Which of the following best describes the formal charge on the nitrogen atom in the cyanide ion ($$\mathrm{CN^-}$$)?

Accepted Answer

The nitrogen atom has a formal charge of $$-1.$$

Question 13

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 14

Which of the following best describes the effect of an electric field on hydrogen fluoride ($$\mathrm{HF}) $$molecules?

Accepted Answer

The molecules align so that the negative end (F) points toward the positive plate and the positive end (H) points toward the negative plate.

Question 15

Which of the following is the correct formula for the compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 16

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 17

Arrange the following ions in order of increasing size: $$\mathrm{Ba$$^{2+}$$}$$, $$\mathrm{Cs^+}$$, $$\mathrm{I^-}$$, $$\mathrm{Te$$^{2-}$$}.$$

Accepted Answer

$$\mathrm{Ba$$^{2+}$$} \u003c Cs^+ \u003c I^- \u003c Te$$^{2-}$$}$$

Question 18

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 19

Which of the following best describes the bond energy of a chemical bond?

Accepted Answer

The amount of energy required to break a bond between two atoms in a molecule

Bonding: General Concepts – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard