Q: Which equation correctly expresses the calculation of molarity ($$M) $$for a solution?

$$M = \frac{\text{moles of solute}}{\text{liters of solvent}}$$

Question 1

Which of the following best describes the difference between potential energy and kinetic energy in the context of human physiology?

Accepted Answer

Potential energy is stored in chemical bonds and can be released to perform work, while kinetic energy is the energy of motion, such as muscle contraction.

Question 2

A solution is described as a homogeneous mixture. Which of the following best explains this property?

Accepted Answer

The components are evenly distributed and do not settle out, resulting in a uniform composition throughout.

Question 3

Which of the following elements makes up the largest percentage of the human body by mass?

Accepted Answer

Oxygen

Question 4

A patient receives a radioactive isotope for diagnostic imaging. Which property of the isotope is most important for its use in medicine?

Accepted Answer

It undergoes radioactive decay, emitting energy that can be detected by imaging equipment.

Question 5

Which equation correctly expresses the calculation of molarity ($$M) $$for a solution?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solvent}}$$

Question 6

Which statement best explains why atoms form chemical bonds?

Accepted Answer

Atoms form chemical bonds to achieve stability by filling their valence electron shells, often following the octet rule.

Question 7

A molecule of water ($$H_2O) is an $$example of which type of covalent bond?

Accepted Answer

Polar covalent bond

Question 8

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another, resulting in oppositely charged ions that attract each other.

Question 9

Which of the following is true regarding isotopes of an element?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 10

A glucose solution is prepared by dissolving 18.02 grams of glucose ($$C_6H_{12}O_6$) in enough water to make 1 liter of solution. What is the molarity (M$) of the solution? (Molecular weight of glucose = 180.12 g/mol)

Accepted Answer

$$M = \frac{18.02}{180.12} = 0.10$$

Question 11

Which of the following best describes a suspension?

Accepted Answer

A heterogeneous mixture in which visible solute particles settle out over time.

Question 12

Which of the following is NOT a form of energy relevant to human physiology?

Accepted Answer

Gravitational energy

Question 13

Which statement about electrons in chemical bonding is correct?

Accepted Answer

Electrons in the outermost shell (valence electrons) are involved in chemical reactions and bonding.

Question 14

Which of the following best explains why energy conversions in the body are inefficient?

Accepted Answer

Some energy is lost as heat during conversions, making the process less than 100% efficient.

Question 15

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

Accepted Answer

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

Question 16

Which type of chemical bond is formed by the sharing of two pairs of electrons between two atoms?

Accepted Answer

Double covalent bond

Question 17

A molecule of $$CO_2 is $$electrically balanced because it has equal sharing of electrons between atoms. What type of bond does this represent?

Accepted Answer

Nonpolar covalent bond

Question 18

Which of the following best describes a hydrogen bond?

Accepted Answer

An attractive force between an electropositive hydrogen of one molecule and an electronegative atom of another molecule.

Question 19

If an atom has 7 electrons in its valence shell, what is it most likely to do during chemical bonding?

Accepted Answer

Gain one electron to achieve a stable octet.

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