Question 1

Which of the following best describes the difference between an ionic compound and a molecular compound?

Accepted Answer

Ionic compounds are formed by the transfer of electrons from metals to nonmetals, resulting in oppositely charged ions, while molecular compounds are formed by the sharing of electrons between nonmetals.

Question 2

A nurse needs to prepare 250 mL of a 0.9% (w/v) NaCl solution for intravenous use. How many grams of NaCl are required?

Accepted Answer

$$2.25\ 	ext{g}$$

Question 3

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have the same number of valence electrons.

Question 4

A sample of gas occupies $$2.50\ 	ext{L} at$$ $$1.00\ 	ext{atm}$$ and $$25^\circ	ext{C}. $$What will be its volume at $$2.00\ 	ext{atm}$$ and $$25^\circ	ext{C}$$, assuming the amount of gas remains constant?

Accepted Answer

$$1.25\ 	ext{L}$$

Question 5

Which of the following best explains why water is a polar molecule?

Accepted Answer

Water has a bent molecular geometry and an unequal distribution of electrons due to the difference in electronegativity between hydrogen and oxygen.

Question 6

A reaction is at equilibrium. Which of the following changes will shift the equilibrium to the right for the exothermic reaction $$\ce{N_2$(g) + 3H_2(g)  2NH_3(g) + heat}$$?

Accepted Answer

Removing $$\ce{NH_3$}$$ from the system

Question 7

Which of the following is the correct balanced equation for the combustion of propane ($$\ce{C_3H_8}$$)?

Accepted Answer

$$\ce{C_3H_8 + 5O_2 -\u003e 3CO_2 + 4H_2O}$$

Question 8

A solution is prepared by dissolving $$10.0\ 	ext{g} of $$glucose ($$\ce{C_6H_{12}O_6$}$$, molar mass $$180\ 	ext{g/mol}) in $$enough water to make $$500\ 	ext{mL} of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.0500\ 	ext{M}$$

Question 9

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry definition?

Accepted Answer

An acid is a substance that donates a proton ($$\ce{H^+}$$), and a base is a substance that accepts a proton.

Question 10

A radioactive isotope has a half-life of 8 hours. If a hospital receives a $$32\ 	ext{mg}$$ sample, how much will remain after 24 hours?

Accepted Answer

$$4\ 	ext{mg}$$

Question 11

Which of the following laboratory safety practices is most important when working with concentrated acids?

Accepted Answer

Always add acid to water, not water to acid.

Question 12

Which of the following best describes the process of titration in a laboratory setting?

Accepted Answer

A technique used to determine the concentration of a solution by slowly adding a solution of known concentration until the reaction is complete.

Question 13

A patient is administered a medication that is a weak base. Which of the following will increase the amount of the base in its protonated (ionized) form in the bloodstream?

Accepted Answer

Decreasing the pH of the blood

Question 14

Which of the following is the correct electron configuration for a neutral atom of sodium ($$\ce{Na}$$, atomic number 11)?

Accepted Answer

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

Question 15

A $$0.50\ 	ext{mol}$$ sample of an ideal gas is at $$27^\circ	ext{C}$$ and $$1.00\ 	ext{atm}. $$What is its volume? (Use $$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K})$$

Accepted Answer

$$12.2\ 	ext{L}$$

Question 16

Which of the following best explains why increasing the temperature generally increases the rate of a chemical reaction?

Accepted Answer

It increases the number of collisions with sufficient energy to overcome the activation energy barrier.

Question 17

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 18

A solution contains $$0.10\ 	ext{mol} of$$ $$\ce{NaCl}$$ dissolved in $$1.0\ 	ext{L} of $$water. What is the concentration of chloride ions ($$\ce{Cl^-}) in $$the solution?

Accepted Answer

$$0.10\ 	ext{M}$$

Question 19

Which of the following best describes the process of osmosis?

Accepted Answer

The movement of solvent molecules from a region of lower solute concentration to a region of higher solute concentration through a semipermeable membrane.

CHEMISTRY 121: General Chemistry for Health Sciences – Syllabus and Course Structure Study Guide

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