Question 1

Which of the following best explains why the ionic radius of Cl⁻ is larger than the atomic radius of neutral Cl?

Accepted Answer

Cl⁻ has gained an electron, increasing electron-electron repulsion and expanding the electron cloud.

Question 2

Which of the following compounds will have the greatest force of attraction between its ions according to Coulomb’s Law?

Accepted Answer

$$\mathrm{MgO}$$

Question 3

What is the correct name for the compound $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 4

Which of the following best describes what happens when table salt ($$\mathrm{NaCl}) is $$dissolved in water?

Accepted Answer

The $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions dissociate and become surrounded by water molecules.

Question 5

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 6

Which of the following statements about ionization energy is correct?

Accepted Answer

Ionization energy increases across a period from left to right.

Question 7

What is the empirical formula for a compound formed between $$\mathrm{Ca$$^{2+}$$}$$ and $$\mathrm{PO_4$^{3-}}$$?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 8

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 increasing effective nuclear charge.

Question 9

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 10

Which of the following polyatomic ions has a $$-2$$ charge?

Accepted Answer

Sulfate ($$\mathrm{SO_4$^{2-}})$$

Question 11

Which of the following best explains why $$\mathrm{Mg$$^{2+}$$} is $$smaller than $$\mathrm{Mg}$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$ has lost two electrons, reducing electron-electron repulsion.

Question 12

Which of the following is the correct formula for iron(III) oxide?

Accepted Answer

$$\mathrm{Fe_2O_3}$$

Question 13

Which of the following best describes the difference between how sugar and salt dissolve in water?

Accepted Answer

Sugar molecules remain intact, while salt dissociates into ions.

Question 14

Which of the following is the correct Lewis structure for ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

A nitrogen atom with three single bonds to hydrogen and one lone pair on nitrogen.

Question 15

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

Accepted Answer

Copper(II) sulfate pentahydrate

Question 16

Which of the following ions is isoelectronic with $$\mathrm{Ar}$$?

Accepted Answer

$$\mathrm{K^+}$$

Question 17

Which of the following best describes the trend in electron affinity across a period?

Accepted Answer

Electron affinity generally becomes more negative (more exothermic) across a period.

Question 18

Which of the following is the correct formula for ammonium phosphate?

Accepted Answer

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

Question 19

Which of the following best explains why the second ionization energy of sodium is much higher than the first?

Accepted Answer

The second electron is removed from a stable, noble gas configuration.

Chapter 4: From Elements to Compounds – Ionic and Covalent Bonding, Periodic Properties, and Compound Formation

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