Question 1

Which of the following statements best describes the difference between organic and inorganic chemistry according to modern definitions?

Accepted Answer

Organic chemistry is the study of carbon compounds, while inorganic chemistry is the synthesis and behavior of inorganic and organometallic compounds.

Question 2

Which of the following is NOT a property of matter?

Accepted Answer

Matter can be compressed infinitely.

Question 3

A sample of chlorine contains two isotopes: $$^{35}Cl (75$$%) and $$^{37}Cl (25$$%). What is the average atomic mass of chlorine?

Accepted Answer

$$35.5$$

Question 4

Which of the following best explains why solids have a definite shape and volume?

Accepted Answer

Particles in solids are arranged in a lattice with strong forces of attraction.

Question 5

Given an atom with atomic number $$Z = 17$$ and mass number $$A = 36$$, how many neutrons does it have?

Accepted Answer

$$19$$

Question 6

Which subatomic particle has the smallest relative mass?

Accepted Answer

Electron

Question 7

What is the charge of a magnesium ion ($$Mg^{2+}) $$and why?

Accepted Answer

It has a charge of $$2+$$ because it has two more protons than electrons.

Question 8

Which of the following is a correct definition of an isotope?

Accepted Answer

Atoms of the same element with the same number of protons but different numbers of neutrons.

Question 9

Which type of chemical bonding involves the sharing of valence electrons between nonmetals?

Accepted Answer

Covalent bonding

Question 10

What is the formula to calculate the number of possible stereoisomers for a molecule with $$n$$ asymmetric carbons?

Accepted Answer

$$2^n$$

Question 11

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH by neutralizing added acid or base.

Question 12

Which of the following is true about the carbonic acid-bicarbonate buffer system in blood?

Accepted Answer

It contains significant amounts of both weak acid and conjugate base.

Question 13

Which of the following is a correct representation of the dissociation of a strong acid in aqueous solution?

Accepted Answer

$$HA \rightarrow H^+ + A^-$$

Question 14

Which statement about enantiomers is correct?

Accepted Answer

Enantiomers are non-superimposable mirror images and are chemically identical in achiral environments.

Question 15

Which of the following is NOT a biological macromolecule?

Accepted Answer

Salt

Question 16

Which of the following is a monomer for proteins?

Accepted Answer

Amino acid

Question 17

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is composed of two or more elements chemically combined, while a mixture is composed of substances that retain their own properties.

Question 18

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Homogenized milk

Question 19

Which statement about the physiological significance of D- and L- forms of carbohydrates is correct?

Accepted Answer

Only D-monosaccharides are of physiological significance in humans.

Foundations of Chemistry for Biochemistry Students

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