$$\mathrm{p-p}$$\ \text{side-to-side}$

Question 1

Which type of bond forms when two atoms share electrons unequally, such as in a water molecule?

Accepted Answer

Polar covalent

Question 2

A solution contains 10.0 g of NaOH dissolved in 250.0 mL of water. What is the molarity of the solution? (Molar mass of NaOH = 40.0 g/mol)

Accepted Answer

$$1.0\ \mathrm{M}$$

Question 3

What is the molecular geometry of BF$$_3$$?

Accepted Answer

Trigonal planar

Question 4

How many valence electrons does an atom of oxygen have?

Accepted Answer

Six electrons

Question 5

What is the percent by mass of oxygen in H$$_2O$$? (Molar mass H$$_2O = 18.0 g/$$mol, O = 16.0 g/mol)

Accepted Answer

$$88.9\%$$

Question 6

Which element is the most electronegative?

Accepted Answer

Fluorine

Question 7

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 8

The shape of ammonia (NH$$_3) is $$best described as:

Accepted Answer

Trigonal pyramidal

Question 9

What is the mass of solute in 500.0 mL of 2.00 M NaCl solution? (Molar mass NaCl = 58.4 g/mol)

Accepted Answer

$$58.8\ \mathrm{g}$$

Question 10

Which property is typical of covalent compounds?

Accepted Answer

Contain electrons shared between atoms

Question 11

How many shared electron pairs are in a triple bond?

Accepted Answer

3

Question 12

Which molecule has a polar bond but a symmetrical shape, resulting in a nonpolar molecule?

Accepted Answer

CO$$_2$$

Question 13

What is the molar mass of MgCl$$_2$$? (Mg = 24.3 g/mol, Cl = 35.5 g/mol)

Accepted Answer

$$74.5\ \mathrm{g/mol}$$

Question 14

A water sample contains 3.5 mg of sodium chloride (NaCl) dissolved in 1.0 L of water. What is the concentration of NaCl in ppm?

Accepted Answer

$$3.5\ \mathrm{ppm}$$

Question 15

Which pair of elements is most likely to form a covalent compound?

Accepted Answer

C and O

Question 16

A solution contains 5.0 g of NaCl dissolved in 95.0 g of water. What is the mass percent of NaCl?

Accepted Answer

$$4.76\%$$

Question 17

Which molecule exhibits resonance?

Accepted Answer

O$$_3$$

Question 18

Which orbital overlap forms a pi bond?

Accepted Answer

$$\mathrm{p-p}$$\ 	ext{side-to-side}$

Question 19

How many moles of solute are in 2.0 L of 0.50 M KCl solution?

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 20

Which molecule has a bent shape?

Accepted Answer

H$$_2O$$

Question 21

When atoms bond to lower their potential energy, what happens to the system?

Accepted Answer

Energy is released

General Chemistry: Covalent Bonding, Molecular Geometry, and Solutions – Study Guide

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