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

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

Question 1

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

Accepted Answer

A compound involves chemical bonding between elements, while a mixture does not involve chemical bonding.

Question 2

A patient is given a solution of glucose in water intravenously. If the solution contains 18.02 grams of glucose (C$$_6H$_{12}O$_6) $$per liter, what is the molarity of the solution? (Molecular weight of glucose = 180.12 g/mol)

Accepted Answer

$$0.1\ 	ext{M}$$

Question 3

Which of the following statements about isotopes is TRUE?

Accepted Answer

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

Question 4

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in an unequal sharing of electrons.

Question 5

A radioactive isotope is used in a PET scan to detect cancerous tissue. Which property of radioisotopes makes this possible?

Accepted Answer

They have the same chemical properties as stable isotopes, allowing them to be taken up by the body.

Question 6

Which of the following best describes the octet rule as it applies to chemical bonding?

Accepted Answer

Atoms are most stable when they have eight electrons in their outermost shell.

Question 7

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

Accepted Answer

$$	ext{AB} ightarrow 	ext{A} + 	ext{B}$$

Question 8

A sodium atom (Na) loses one electron to become Na$$^+. $$What type of bond is most likely to form between Na$$^+$$ and Cl$$^-$$?

Accepted Answer

Ionic bond

Question 9

Which of the following best describes a colloid?

Accepted Answer

A heterogeneous mixture in which particles are not evenly distributed and do not settle out.

Question 10

Which of the following is a property of water that is essential for temperature regulation in the human body?

Accepted Answer

High heat of vaporization

Question 11

A patient is suffering from dehydration. Which property of water is most important in helping to maintain blood volume and pressure?

Accepted Answer

Water's solvent properties

Question 12

Which of the following best describes a hydrogen bond?

Accepted Answer

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

Question 13

Which of the following is TRUE regarding endergonic and exergonic reactions?

Accepted Answer

Endergonic reactions result in a net absorption of energy, while exergonic reactions result in a net release of energy.

Question 14

Which of the following best explains why catalysts are important in biological systems?

Accepted Answer

They increase the rate of reactions without being consumed in the process.

Question 15

A molecule of water (H$$_2O) is $$formed by which type of chemical bond?

Accepted Answer

Covalent bond

Question 16

Which of the following is a correct statement about the structure of atoms?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit around the nucleus.

Question 17

Which of the following best describes a solution?

Accepted Answer

A mixture in which particles are evenly distributed and do not settle out.

Question 18

Which of the following is an example of an exchange reaction?

Accepted Answer

$$	ext{AB} + 	ext{CD} ightarrow 	ext{AD} + 	ext{CB}$$

Question 19

Which of the following is TRUE about the planetary model of the atom?

Accepted Answer

It is useful for illustrations but does not accurately represent electron locations.

Question 20

A patient is exposed to a radioactive isotope for cancer treatment. Which of the following is a potential risk of this therapy?

Accepted Answer

Some radioisotopes can cause cancer due to the radiation they emit.

Chemistry and Biochemistry Foundations for Anatomy & Physiology

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