Question 1

How many significant figures are in the measurement 1.00243 g?

Accepted Answer

6

Question 2

How many atoms of copper, Cu, are there in 5.81 	imes $$10^{-2} g of $$copper? (Atomic mass of Cu = 63.55 g/mol)

Accepted Answer

$$5.51 	imes 10$$^{21}$$

Question 3

What is the wavelength (in m) of light with a frequency of $$6.52 	imes 10$$^{15}$$ s$$^{-1}$$? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$4.60 	imes 10$$^{-8}$$

Question 4

Which of the following is a set of quantum numbers for a 4p electron?

Accepted Answer

$$n=4,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 5

How many unpaired electrons does a tellurium atom have?

Accepted Answer

2

Question 6

Which of the following has the largest atomic radius?

Accepted Answer

Se

Question 7

Which of the following ionic compound formulas is incorrect?

Accepted Answer

BaCl$$_3$$

Question 8

Which of the following molecules/ions has a central atom with an expanded octet?

Accepted Answer

SF$$_6$$

Question 9

Draw the best Lewis structure for NO$$_3^-. $$What is the formal charge on the N?

Accepted Answer

0

Question 10

What are the bond angles of a molecule with three bonding groups and zero lone pairs at the central atom?

Accepted Answer

$$120^\circ$$

Question 11

Which of the following molecules is polar?

Accepted Answer

SF$$_4$$

Question 12

What is the hybridization of the central atom in PH$$_3$$?

Accepted Answer

sp$$^3$$

Question 13

Sodium azide, NaN$$_3$$, is used to inflate automobile air bags. The reaction is $$2	ext{NaN}_3 (s) ightarrow 2	ext{Na} (s) + 3	ext{N}_2 (g). $$What mass of sodium azide can be produced from 50.0 g Na and 21.0 g N$$_2$$?

Accepted Answer

73.0 g

Question 14

What is the molarity of a solution made by dissolving 7.5 g of CaCl$$_2 in $$enough water to make 150 mL of solution? (Molar mass CaCl$$_2 = 110.98 g/$$mol)

Accepted Answer

$$0.68 M$$

Question 15

How many electrons does a Fe$$^{3+}$$ ion have?

Accepted Answer

24

Question 16

Which of the following pairs of atoms will form a polar covalent bond?

Accepted Answer

S and O

Question 17

Using the molecular orbital diagram, determine the bond order of O$$_2.$$

Accepted Answer

2

Question 18

Using the molecular orbital diagram, which of the following is paramagnetic?

Accepted Answer

O$$_2$$

Question 19

Consider the following list of successive ionization energies for a fictitious element. Based on these ionization energies, which group would this element belong to?
1st ionization energy = 535 kJ/mol
2nd ionization energy = 1,300 kJ/mol
3rd ionization energy = 2,500 kJ/mol
4th ionization energy = 5,200 kJ/mol
5th ionization energy = 7,175 kJ/mol

Accepted Answer

Group 1

Question 20

Which of the following transitions will result in light with the longest wavelength?

Accepted Answer

$$n=3 \rightarrow n=2$$

General Chemistry Final Exam Review: Key Concepts and Practice

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