Q: Based on the equation sheet in image 14, what is the formula for molarity?

$$M = \\frac{\\text{mol solute}}{\\text{L solution}}$$

Question 1

Which main-group element is represented by the Lewis electron-dot symbol shown in image 1, and what is its valence electron configuration?

Accepted Answer

Group 6A, $$(2s)^2$$ $$(2p)^4$$

Question 2

Referencing image 2, what is the molecular geometry of a molecule with the VSEPR formula $$AX_3E$$?

Accepted Answer

Trigonal pyramidal

Question 3

Using image 3, which atom in the NCl$$_3$$ Lewis structure has a lone pair, and how many lone pairs are on each chlorine atom?

Accepted Answer

Nitrogen has a lone pair; each chlorine has three lone pairs

Question 4

Based on image 4, which Lewis structure correctly represents NCl$$_3$$?

Accepted Answer

The structure with three single bonds from N to Cl and a lone pair on N

Question 5

Refer to image 5. What is the electron group geometry of the molecule shown?

Accepted Answer

Trigonal bipyramidal

Question 6

Using images 6, 7, 8, and 9, which structure has the most lone pairs on the central atom, and which structures have no lone pairs?

Accepted Answer

IV has the most lone pairs; I and III have no lone pairs

Question 7

In image 10, what are the ideal values for the three indicated bond angles in glycine?

Accepted Answer

$$109.5^	ext{o}, 120^	ext{o}, 109.5^	ext{o}$$

Question 8

Using the periodic table in image 11, which element has the highest electronegativity?

Accepted Answer

Fluorine

Question 9

Based on the equation sheet in image 12, what is the value of the gas constant $$R in $$units of $$(	ext{atm} \cdot \text{L})/(	ext{mol} \cdot \text{K})$$?

Accepted Answer

$$0.0821$$

Question 10

Referencing the periodic table in image 11, which group contains elements with a valence electron configuration of $$(ns)^2$$ $$(np)^4$$?

Accepted Answer

Group 6A

Question 11

Using the equation sheet in image 13, what is the formula for work done by a gas during expansion or compression?

Accepted Answer

$$w = -P \Delta V$$

Question 12

Based on the equation sheet in image 14, what is the formula for molarity?

Accepted Answer

$$M = \frac{\text{mol solute}}{\text{L solution}}$$

Question 13

Which element in the periodic table (image 11) is most likely to form a triple bond with itself?

Accepted Answer

Nitrogen

Question 14

Using the Lewis structure in image 3, what is the total number of valence electrons in NCl$$_3$$?

Accepted Answer

26

Question 15

Referencing image 5, what is the ideal bond angle for a molecule with trigonal bipyramidal electron group geometry?

Accepted Answer

$$90^	ext{o}$$ and $$120^	ext{o}$$

Question 16

Based on the VSEPR model shown in image 2, which molecule has a similar geometry to CH$$_3^-$$?

Accepted Answer

NH$$_3$$

Question 17

Using the periodic table in image 11, which element is most likely to form an ionic bond with sodium?

Accepted Answer

Chlorine

Question 18

Based on the equation sheet in image 13, what is the definition of enthalpy?

Accepted Answer

$$H = E + PV$$

General Chemistry Exam 4 Study Guidance: Bonding, Molecular Shapes, and Covalent Theory

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