Q: Which equation correctly represents the calculation of atomic mass for an atom?

$$\text{Atomic mass} = \text{Number of protons} + \text{Number of neutrons}$$

Q: If a sample contains 3 moles of sodium chloride ($$\mathrm{NaCl}$$), what is the total number of sodium atoms present? (Avogadro's number $$= 6.022 \times 10$$^{23}$$)

$$1.81 \times 10$$^{24}$$ sodium atoms

Q: Which of the following is the correct formula for calculating molecular weight?

$$\text{Molecular weight} = \sum \text{atomic weights of all atoms in the molecule}$$

Question 1

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

Accepted Answer

Potential energy is stored in chemical bonds, while kinetic energy is the energy of motion, such as muscle contraction.

Question 2

A charged battery, a stretched spring, and the bonds of a nutrient molecule are all examples of which type of energy?

Accepted Answer

Potential energy

Question 3

Which equation correctly represents the calculation of atomic mass for an atom?

Accepted Answer

$$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 5

Which of the following best explains why chemical energy is important for biological systems?

Accepted Answer

Chemical energy stored in bonds can be converted to kinetic energy for cellular work.

Question 6

A molecule of water ($$\mathrm{H_2O}) is $$formed by which type of bond between its atoms?

Accepted Answer

Covalent bond

Question 7

Which of the following is a correct definition of a molecule?

Accepted Answer

A molecule is two or more atoms joined together by chemical bonds.

Question 8

If a sample contains 3 moles of sodium chloride ($$\mathrm{NaCl}$$), what is the total number of sodium atoms present? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.81 	imes 10$$^{24}$$ sodium atoms

Question 9

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

Accepted Answer

A mixture consists of substances physically combined, while a compound consists of atoms chemically bonded.

Question 10

Which of the following is the correct formula for calculating molecular weight?

Accepted Answer

$$	ext{Molecular weight} = \sum 	ext{atomic weights of all atoms in the molecule}$$

Question 11

A patient is given a radioactive isotope for diagnostic imaging. Which property of isotopes makes them useful for this purpose?

Accepted Answer

Some isotopes are unstable and emit radiation detectable by imaging equipment.

Question 12

Which of the following is true regarding the arrangement of electrons in an atom?

Accepted Answer

Electrons occupy energy levels (shells) around the nucleus, with the first shell holding up to 2 electrons.

Question 13

Which of the following best explains why hydrogen is considered the simplest atom?

Accepted Answer

Hydrogen has one proton and one electron, with no neutrons in its most common isotope.

Question 14

Which of the following is a real-life example of a physical change, not a chemical change?

Accepted Answer

Melting ice into water

Question 15

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

Accepted Answer

Electrons in the outermost shell are involved in forming chemical bonds between atoms.

Question 16

A molecule of glucose ($$\mathrm{C_6H_{12}O_6$}) $$contains how many atoms in total?

Accepted Answer

24 atoms

Question 17

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

Accepted Answer

Energy conversions are never 100% efficient; some energy is lost as heat.

Question 18

Which of the following is the best example of work performed by the human body?

Accepted Answer

Muscle contraction to move a limb

Question 19

Which of the following is true regarding the concept of atomic number?

Accepted Answer

Atomic number is equal to the number of protons in the nucleus of an atom.

Question 20

Which of the following best explains why we review chemistry at the beginning of a physiology course?

Accepted Answer

Understanding chemistry provides the foundation for studying physiological processes at the molecular level.

Chemistry Comes Alive: The Chemical Level of Organization (Anatomy & Physiology Study Notes)

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