Question 1

A patient receives 250 mg of a medication. If the medication is supplied as 50 mg/mL, how many milliliters should be administered?

Accepted Answer

$$5\ \mathrm{mL}$$

Question 2

Which of the following is the correct chemical formula for calcium nitrate?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 3

What is the electron configuration for the chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 4

Which of the following is the correct Lewis structure for water ($$\mathrm{H_2O}$$)?

Accepted Answer

Oxygen atom in the center with two single bonds to hydrogen atoms and two lone pairs on oxygen.

Question 5

Balance the following chemical equation: $$\mathrm{C_2H_6} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

$$2\ \mathrm{C_2H_6} + 7\ \mathrm{O_2$} \rightarrow 4\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Question 6

Calculate the molar mass of sodium sulfate ($$\mathrm{Na_2SO_4}).$$

Accepted Answer

$$142\ \mathrm{g/mol}$$

Question 7

How many moles are in 36 grams of water ($$\mathrm{H_2O}$$)? ($$\mathrm{Molar\ mass\ of\ H_2O = 18\ g/mol})$$

Accepted Answer

$$2\ \mathrm{mol}$$

Question 8

In a reaction, $$10.0\ \mathrm{g} of $$product is obtained, but the theoretical yield is $$12.5\ \mathrm{g}. $$What is the percent yield?

Accepted Answer

$$80\%$$

Question 9

Which of the following best describes the scientific method as applied in a chemistry laboratory?

Accepted Answer

Making observations, forming a hypothesis, conducting experiments, analyzing data, and drawing conclusions.

Question 10

Which of the following statements about solids, liquids, and gases is correct?

Accepted Answer

Solids have a definite shape and volume, liquids have a definite volume but no definite shape, and gases have neither definite shape nor volume.

Question 11

Which type of intermolecular force is the strongest among the following?

Accepted Answer

Hydrogen bonding

Question 12

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 13

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

$$\mathrm{HCl}$$

Question 14

What is the pH of a $$0.001\ \mathrm{M}$$ HCl solution?

Accepted Answer

$$3$$

Question 15

Write the equilibrium constant expression for the following reaction: $$\mathrm{N_2$(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}$$

Accepted Answer

$$K = \dfrac{[NH_3$]^2}{[N_2$][H_2$]^3}$$

Question 16

Why is knowing the numerical value of an equilibrium constant ($$K) $$useful in chemical reactions?

Accepted Answer

It indicates the extent to which reactants are converted to products at equilibrium.

Question 17

A solution is made by dissolving $$5.85\ \mathrm{g} of $$NaCl in enough water to make $$500\ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{Molar\ mass\ of\ NaCl = 58.5\ g/mol})$$

Accepted Answer

$$0.2\ \mathrm{M}$$

Question 18

Which of the following best describes the difference between ionic and molecular compounds?

Accepted Answer

Ionic compounds are formed from metals and nonmetals, while molecular compounds are formed from nonmetals only.

Question 19

A chemical reaction has a theoretical yield of $$50\ \mathrm{g}$$, but only $$30\ \mathrm{g} is $$actually produced. What is the percent yield?

Accepted Answer

$$60\%$$

CHM 1020 Final Exam Study Guide: Essential Concepts in Introductory Chemistry

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