Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter a substance contains, while weight is the force of gravity acting on that mass.

Question 2

A patient presents with a large swelling in the neck region, which is diagnosed as a goiter. This condition is most likely caused by a deficiency in which trace element?

Accepted Answer

Iodine

Question 3

Which of the following statements about chemical elements is correct?

Accepted Answer

Each element is defined by its number of protons in the atomic nucleus.

Question 4

Which equation correctly represents the law of conservation of mass in a chemical reaction?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 5

Which of the following best explains why water is an excellent solvent for ionic and polar substances?

Accepted Answer

Water is a polar molecule, so it can interact with charged and partially charged solutes.

Question 6

Which of the following is true regarding the atomic structure of carbon?

Accepted Answer

Carbon has 6 protons, 6 neutrons, and 6 electrons.

Question 7

Which type of chemical bond involves the sharing of electrons between two nonmetals?

Accepted Answer

Covalent bond

Question 8

A sodium atom donates an electron to a chlorine atom, forming sodium chloride. What type of bond is formed?

Accepted Answer

Ionic bond

Question 9

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges on the atoms.

Question 10

Which of the following is a property of water that helps maintain body temperature during exercise?

Accepted Answer

High heat of vaporization

Question 11

Which of the following reactions is an example of a decomposition reaction?

Accepted Answer

$$2H_2O \rightarrow 2H_2 + O_2$

Question 12

Which statement about activation energy and catalysts is correct?

Accepted Answer

Activation energy is the energy needed to start a chemical reaction.

Question 13

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

Oxidation is the loss of electrons and reduction is the gain of electrons.

Question 14

Which of the following is true about organic compounds?

Accepted Answer

Organic compounds always contain carbon and usually hydrogen.

Question 15

A radioactive isotope is used in medical imaging to detect thyroid disorders. Which isotope is commonly used for this purpose?

Accepted Answer

Iodine-131

Question 16

Which of the following best explains why water acts as a lubricant in the human body?

Accepted Answer

Water's high density allows it to cushion and protect body structures.

Question 17

Which of the following is a correct statement about the atomic mass of an element?

Accepted Answer

Atomic mass is the average mass of all naturally occurring isotopes of an element.

Question 18

Which of the following best describes a synthesis reaction?

Accepted Answer

A reaction in which two or more simple substances combine to form a more complex substance.

Question 19

Which property of water allows it to absorb a large amount of heat without a significant change in temperature?

Accepted Answer

High heat capacity

The Chemistry of Life – Foundations for Anatomy & Physiology

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