Question 1

Which of the following statements best describes the difference between an acid and a base according to the Brønsted-Lowry theory?

Accepted Answer

An acid donates a proton ($$\mathrm{H^+}$$), while a base accepts a proton ($$\mathrm{H^+}).$$

Question 2

Which of the following compounds is most likely to have the highest boiling point?

Accepted Answer

Ethanol ($$\mathrm{C_2H_5OH})$$

Question 3

A solution has a pH of 3. What is the concentration of hydrogen ions ($$[\mathrm{H^+}]) in $$the solution?

Accepted Answer

$$1 	imes 10$$^{-3}$$ M

Question 4

Which of the following is the correct IUPAC name for the compound $$\mathrm{CH_3CH_2COOH}$$?

Accepted Answer

Propanoic acid

Question 5

Which of the following molecules is an example of a primary alcohol?

Accepted Answer

Methanol ($$\mathrm{CH_3OH})$$

Question 6

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structural formulas.

Question 7

A buffer solution is prepared by mixing acetic acid ($$\mathrm{CH_3COOH}) $$and sodium acetate ($$\mathrm{CH_3COONa}). $$What is the main function of this buffer?

Accepted Answer

To resist changes in pH upon addition of small amounts of acid or base

Question 8

Which of the following reactions is an example of a nucleophilic addition?

Accepted Answer

Addition of water to an aldehyde to form a hydrate

Question 9

Which of the following compounds is aromatic?

Accepted Answer

Benzene

Question 10

A medical student accidentally mixes hydrochloric acid ($$\mathrm{HCl}) $$with sodium hydroxide ($$\mathrm{NaOH}). $$What is the net ionic equation for the reaction that occurs?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 11

Which of the following best explains why carboxylic acids are more acidic than alcohols?

Accepted Answer

The carboxylate ion formed after deprotonation is stabilized by resonance.

Question 12

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$\mathrm{pH = -\log_{10}[H^+]}$$

Question 13

Which of the following is a tertiary amine?

Accepted Answer

Trimethylamine ($$\mathrm{(CH_3$)_3N})$$

Question 14

Which of the following statements about aldehydes and ketones is correct?

Accepted Answer

Aldehydes have the carbonyl group at the end of the carbon chain, while ketones have it within the chain.

Question 15

Which of the following is the correct structure for benzene?

Accepted Answer

A six-membered ring with alternating single and double bonds

Question 16

Which of the following reactions is used to synthesize esters from carboxylic acids and alcohols?

Accepted Answer

Esterification

Question 17

Which of the following is a correct statement about aromatic compounds?

Accepted Answer

Aromatic compounds contain conjugated pi electron systems that follow Hückel's rule.

Question 18

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

$$\mathrm{Molarity = \frac{moles\ of\ solute}{volume\ of\ solution\ (L)}}$$

Question 19

Which of the following is a common use of aromatic compounds in medicine?

Accepted Answer

As antiseptics and anesthetics

Introduction to Chemistry: Core Concepts for Medical Admissions

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