Question 1

Which of the following best describes the difference between a suspension and a colloid in terms of particle size and distribution?

Accepted Answer

Suspensions contain large, unevenly distributed particles that will settle out, while colloids contain small, evenly distributed particles that do not settle.

Question 2

A sodium atom ($$\mathrm{Na}) $$has 11 protons and 11 electrons. When it loses one electron to form $$\mathrm{Na^+}$$, what happens to its atomic structure and why does it form an ionic bond with chlorine?

Accepted Answer

It becomes positively charged, achieving a stable electron configuration, and forms an ionic bond with negatively charged chlorine ($$\mathrm{Cl^-}).$$

Question 3

Which of the following best explains why water molecules are attracted to each other at the surface, resulting in surface tension?

Accepted Answer

Hydrogen bonds form between partially positive hydrogen atoms and partially negative oxygen atoms of adjacent water molecules.

Question 4

Which equation correctly represents a reversible chemical reaction as described in the study materials?

Accepted Answer

$$\mathrm{CO_2$ + H_2O \rightleftharpoons H_2CO_3}$$

Question 5

A patient is given radioactive iodine-131 for thyroid imaging. Which property of iodine-131 makes it suitable for this medical application?

Accepted Answer

It emits radiation as it decays, allowing detection by imaging equipment.

Question 6

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms.

Question 7

Which of the following best describes the duet rule as it applies to hydrogen and helium?

Accepted Answer

Atoms are most stable when they have two electrons in their valence shell.

Question 8

Which of the following is a correct example of a decomposition (catabolic) reaction?

Accepted Answer

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

Question 9

Which of the following best explains why polar covalent bonds result in molecules with partial charges?

Accepted Answer

Electrons are shared unequally, causing one atom to be partially negative and the other partially positive.

Question 10

Which of the following is NOT a major element found in the human body according to the periodic table slide?

Accepted Answer

Calcium

Question 11

A solution is defined as a mixture in which:

Accepted Answer

Extremely small particles are evenly distributed and do not settle out.

Question 12

Which of the following best describes the role of catalysts in chemical reactions within the human body?

Accepted Answer

Catalysts speed up reactions by lowering the activation energy.

Question 13

Which of the following is true about isotopes?

Accepted Answer

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

Question 14

Which of the following best explains why nonpolar covalent bonds do not result in partial charges within a molecule?

Accepted Answer

Electrons are shared equally between atoms, so there is no charge separation.

Question 15

Which of the following is a correct example of a synthesis (anabolic) reaction?

Accepted Answer

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

Question 16

Which of the following statements about the periodic table is correct?

Accepted Answer

Each element is represented by a chemical symbol.

Question 17

Which of the following best describes the difference between an ion and an atom?

Accepted Answer

An ion has an unequal number of protons and electrons, while an atom has equal numbers of both.

Question 18

Which of the following is true about energy in chemical reactions?

Accepted Answer

Exergonic reactions release energy as products have lower energy than reactants.

Question 19

Which of the following best explains the concept of electronegativity in covalent bonds?

Accepted Answer

Electronegativity is the ability of an atom to attract electrons toward itself in a covalent bond.

Atoms, Elements, Chemical Bonds, and Reactions: Foundations for Anatomy & Physiology

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