Q: A solution is prepared by dissolving 0.5 moles of NaCl in enough water to make 1 liter of solution. What is the molarity ($$M) of $$the solution?

$$M = \frac{0.5\ \text{mol}}{1\ \text{L}} = 0.5\ \text{M}$$

Question 1

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

Accepted Answer

An element is a pure substance made of only one kind of atom, while a compound is a substance made of two or more different elements chemically bonded together.

Question 2

Which subatomic particle determines the unique properties and identity of an atom?

Accepted Answer

Proton

Question 3

A solution is prepared by dissolving 0.5 moles of NaCl in enough water to make 1 liter of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$M = \frac{0.5\ 	ext{mol}}{1\ 	ext{L}} = 0.5\ 	ext{M}$$

Question 4

Which type of chemical bond is the strongest?

Accepted Answer

Covalent bond

Question 5

What is the main reason noble gases are chemically inert?

Accepted Answer

They have a full valence electron shell, satisfying the octet rule.

Question 6

Which of the following best describes a decomposition reaction? Choose the correct example.

Accepted Answer

$$2H_2O \rightarrow 2H_2 + O_2$

Question 7

Which factor would NOT increase the rate of a chemical reaction?

Accepted Answer

Lowering the temperature

Question 8

Which of the following is an example of a base?

Accepted Answer

NaOH (sodium hydroxide)

Question 9

What distinguishes an organic molecule from an inorganic molecule?

Accepted Answer

Organic molecules always contain carbon and hydrogen atoms.

Question 10

Which chemical reaction is used to break down macromolecules into smaller monomers?

Accepted Answer

Hydrolysis

Question 11

What is the ratio of carbon, hydrogen, and oxygen atoms in a carbohydrate?

Accepted Answer

1:2:1

Question 12

Which type of lipid is the chief component of cell membranes?

Accepted Answer

Phospholipids

Question 13

What are the monomers used to build proteins called?

Accepted Answer

Amino acids

Question 14

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 15

Which level of protein structure is defined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 16

What is the common building block for DNA and RNA?

Accepted Answer

Nucleotide

Question 17

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for cellular processes by releasing a phosphate group.

Question 18

A patient is given a buffer solution to stabilize their blood pH. What is the main function of a buffer in this scenario?

Accepted Answer

To resist changes in pH by neutralizing added acids or bases.

Question 19

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally between atoms, resulting in partial charges.

Question 20

Which equation correctly represents the activation energy ($$E_a) $$required for a chemical reaction?

Accepted Answer

$$E_a = E_{transition\ state} - E_{reactants}$$

Fundamental Chemistry Concepts for Anatomy & Physiology

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