Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$1.2 	imes 10^3$

Question 2

A human body has a temperature of 98.6 $$^\circF. $$What is this temperature in $$^\circC$$?

Accepted Answer

$$37^\circC$$

Question 3

A metal cube has a mass of 15.1 g and a volume of 5.25 mL. What is its density?

Accepted Answer

$$2.88\ \mathrm{g/mL}$$

Question 4

Which of the following is a chemical change?

Accepted Answer

Burning wood in a fireplace

Question 5

Which of the following is an ionic compound?

Accepted Answer

Sodium chloride

Question 6

How many moles of Mg are contained in 5.00 g of Mg?

Accepted Answer

$$0.206\ \mathrm{mol}$$

Question 7

What is the empirical formula of a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 8

Balance the following equation: $$\mathrm{Mg(OH)_2} + \mathrm{HCl} \rightarrow \mathrm{$$MgCl_2$$} + \mathrm{H_2O}$$

Accepted Answer

$$\mathrm{Mg(OH)_2} + 2\mathrm{HCl} \rightarrow \mathrm{$$MgCl_2$$} + 2\mathrm{H_2O}$$

Question 9

Which intermolecular force is dominant in $$\mathrm{H_2O}$$?

Accepted Answer

Hydrogen bonding

Question 10

A solution is prepared by dissolving 12.0 g of NaCl in enough water to make 250 mL of solution. What is the molarity of the solution? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.82\ \mathrm{M}$$

Question 11

Which of the following best describes the molecular geometry of $$\mathrm{NH_3$}$$?

Accepted Answer

Trigonal pyramidal

Question 12

What is the pH of a solution with $$[H^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$?

Accepted Answer

4.0

Question 13

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 14

How many molecules are present in 8.31 g of $$\mathrm{H_2O}$$? ($$M_{H_2O} = 18.02\ \mathrm{g/mol}$$, $$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

$$2.78 	imes 10$$^{23}$$

Question 15

A 0.500 M $$\mathrm{H_2SO_4}$$ solution has a density of 1.18 g/mL. How many grams of sulfuric acid are present in 125 mL of this solution?

Accepted Answer

$$6.13\ \mathrm{g}$$

Question 16

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions

Question 17

What is the net ionic equation for the reaction: $$\mathrm{$$MgCl_2$$} (aq) + 2\mathrm{NaOH} (aq) \rightarrow \mathrm{Mg(OH)_2} (s) + 2\mathrm{NaCl} (aq)$$?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$} (aq) + 2\mathrm{OH^-} (aq) \rightarrow \mathrm{Mg(OH)_2} (s)$$

Question 18

Which of the following is the correct Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 19

Which of the following best describes the dominant intermolecular force in $$\mathrm{Cl_2$}$$?

Accepted Answer

London dispersion forces

Question 20

A student dilutes 25.0 mL of 6.00 M HCl to a final volume of 500.0 mL. What is the final concentration?

Accepted Answer

$$0.30\ \mathrm{M}$$

Comprehensive Review Notes for Introduction to Chemistry Final Exam

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