Q: What is the formula weight of $$\mathrm{$$MgCl_2$$}$$? (Atomic weights: Mg = 24.3 u, Cl = 35.5 u)

$$24.3 + 2 \times 35.5 = 95.3\ \mathrm{u}$$

Question 1

Which of the following best explains why sodium (Na) forms a $$\mathrm{Na^+}$$ ion when reacting with chlorine (Cl) to form sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

Sodium loses one electron to achieve the same electron configuration as neon.

Question 2

Which of the following is the correct Lewis structure for a beryllium (Be) atom?

Accepted Answer

Be with two dots around the symbol

Question 3

A molecule of carbon dioxide ($$\mathrm{CO_2$}) is $$described as:

Accepted Answer

A linear molecule because the central carbon has two regions of electron density

Question 4

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 5

What is the formula for the ionic compound formed between aluminum ions ($$\mathrm{Al$$^{3+}$$}) $$and sulfide ions ($$\mathrm{S$$^{2-}$$}$$)?

Accepted Answer

$$\mathrm{Al_2S_3}$$

Question 6

Which of the following statements about VSEPR theory is correct?

Accepted Answer

It predicts the arrangement of atoms in a molecule based on the repulsion between electron pairs.

Question 7

Which of the following best describes the bonding in a molecule of $$\mathrm{H_2O}$$?

Accepted Answer

Two polar covalent bonds and two lone pairs on the central atom

Question 8

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

Accepted Answer

Dinitrogen pentoxide

Question 9

Which of the following best explains why solid sodium chloride ($$\mathrm{NaCl}) $$has a high melting point?

Accepted Answer

It is composed of ions held together by strong electrostatic forces in a crystal lattice.

Question 10

Which of the following is a network solid?

Accepted Answer

Diamond

Question 11

What is the formula weight of $$\mathrm{$$MgCl_2$$}$$? (Atomic weights: Mg = 24.3 u, Cl = 35.5 u)

Accepted Answer

$$24.3 + 2 	imes 35.5 = 95.3\ \mathrm{u}$$

Question 12

Which of the following best describes the difference between a polar and a nonpolar covalent bond?

Accepted Answer

A polar covalent bond involves unequal sharing of electrons, while a nonpolar covalent bond involves equal sharing.

Question 13

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{Br_2$}$$

Question 14

Which of the following is the correct formula for the compound formed between potassium ions ($$\mathrm{K^+}) $$and phosphate ions ($$\mathrm{PO_4$^{3-}}$$)?

Accepted Answer

$$\mathrm{K_3PO_4}$$

Question 15

Which of the following best describes hydrogen bonding?

Accepted Answer

An attractive force between a hydrogen atom covalently bonded to O, N, or F and another electronegative atom

Question 16

Which of the following is the correct name for $$\mathrm{Mg_3N_2}$$?

Accepted Answer

Magnesium nitride

Question 17

A sample contains $$1.00$$ mol of $$\mathrm{CO_2$}. $$What is its mass in grams? (Molecular weight of $$\mathrm{CO_2$} is$$ $$44.0 u)$$

Accepted Answer

$$44.0 g$$

Question 18

Which of the following best describes the electron arrangement around the central atom in ammonia ($$\mathrm{NH_3$}) $$according to VSEPR theory?

Accepted Answer

Four pairs of electrons arranged in a tetrahedral geometry

Question 19

Which of the following is a correct statement about polyatomic ions?

Accepted Answer

They are covalently bonded groups of atoms that carry a net charge.

Chapter 4: Forces Between Particles – Ionic and Covalent Bonding, Lewis Structures, and Molecular Shapes

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