Question 1

Which of the following best describes the difference between a mixture and a compound in terms of their chemical properties?

Accepted Answer

Mixtures can be separated by physical means, while compounds require chemical means for separation.

Question 2

A patient is exposed to a radioisotope for diagnostic imaging. Which property of radioisotopes makes them useful for this purpose?

Accepted Answer

They emit energy spontaneously, which can be detected by imaging equipment.

Question 3

Which of the following equations correctly represents a synthesis reaction?

Accepted Answer

$$ \mathrm{A} + \mathrm{B} \rightarrow \mathrm{AB} $$

Question 4

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 5

A solution of NaCl in water is an example of which type of mixture?

Accepted Answer

Solution

Question 6

Which of the following statements about energy in the human body is correct?

Accepted Answer

Energy is transferred and transformed, but the total amount remains constant according to the law of conservation of energy.

Question 7

Which of the following best explains why water molecules are polar?

Accepted Answer

The oxygen atom has a greater electronegativity, causing an unequal sharing of electrons and a bent molecular shape.

Question 8

A patient’s blood contains a mixture of plasma proteins and water. Which type of mixture does this represent?

Accepted Answer

Colloid

Question 9

Which of the following is true regarding the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the nucleus.

Question 10

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Question 11

Which of the following elements is most abundant in the human body?

Accepted Answer

Oxygen

Question 12

A chemical reaction in the body releases energy. Which type of reaction is this?

Accepted Answer

Exergonic reaction

Question 13

Which of the following is a property of suspensions?

Accepted Answer

Particles settle out over time.

Question 14

Which of the following best describes the role of electrons in chemical bonding?

Accepted Answer

Electrons in the outermost shell (valence electrons) determine the chemical reactivity and bonding of an atom.

Question 15

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

Accepted Answer

$$ \mathrm{AB} \rightarrow \mathrm{A} + \mathrm{B} $$

Question 16

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons.

Question 17

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have a full complement of electrons in their outermost shell.

Question 18

Which of the following is true about exchange reactions in the body?

Accepted Answer

They involve both the breaking and forming of bonds, resulting in the exchange of atoms between molecules.

Question 19

A catalyst in a chemical reaction:

Accepted Answer

Speeds up the reaction by lowering the activation energy without being consumed.

Question 20

Which of the following best describes a polar covalent bond?

Accepted Answer

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

Chemistry Comes Alive: Foundations for Anatomy & Physiology

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