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

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

Question 1

Which of the following best explains why water molecules are able to stick together, resulting in surface tension?

Accepted Answer

Hydrogen bonds form between water molecules due to their polarity.

Question 2

A scientist observes that a paperclip can float on water despite being denser than water. Which property of water is most directly responsible for this phenomenon?

Accepted Answer

Water's surface tension created by cohesion

Question 3

Which of the following is the smallest unit of matter that retains all the properties of an element?

Accepted Answer

An atom

Question 4

What is the atomic number of an element?

Accepted Answer

The total number of protons in the nucleus

Question 5

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

Accepted Answer

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

Question 6

Which of the following best describes the relationship between surface tension and the force required to break the surface of water?

Accepted Answer

Surface tension is the amount of force needed to break the surface of water.

Question 7

Which of the following is responsible for the cohesive property of water?

Accepted Answer

Hydrogen bonds between water molecules

Question 8

A plant moves water up from its roots to its leaves. Which process is primarily responsible for this movement?

Accepted Answer

Capillary action involving cohesion and adhesion

Question 9

Which of the following biological activities best demonstrates water's adhesive properties?

Accepted Answer

Water moving through plant vessels, adhering to the vessel walls

Question 10

Which of the following is a correct statement about valence electrons?

Accepted Answer

Valence electrons are found in the outermost energy shell and are involved in chemical bonding.

Question 11

Which of the following is the correct electric charge for a proton, neutron, and electron, respectively?

Accepted Answer

$$+1$$, $$0$$, $$-1$$

Question 12

Which of the following best describes the result of the polar nature of water molecules?

Accepted Answer

Water molecules form hydrogen bonds, resulting in cohesion and adhesion.

Question 13

Which example illustrates adhesion?

Accepted Answer

Water molecules sticking to a glass surface

Question 14

Which of the following is NOT one of the six bulk elements that make up 97% of the mass of most living organisms?

Accepted Answer

Sodium

Question 15

Which type of chemical bond involves the sharing of electron pairs between atoms, allowing them to achieve a full outer shell?

Accepted Answer

Covalent bond

Question 16

Which of the following organic molecules is primarily responsible for storing and transmitting genetic information?

Accepted Answer

Nucleic acids

Question 17

A molecule is composed of carbon, hydrogen, and oxygen, and serves as a primary energy source and structural component in living organisms. Which class of organic molecule does this describe?

Accepted Answer

Carbohydrates

Question 18

Which of the following best describes a double bond in organic chemistry?

Accepted Answer

A bond where two atoms share two pairs of electrons

Question 19

Which of the following is a correct statement about the structure of organic molecules?

Accepted Answer

Organic molecules can have carbon atoms linked in chains or rings, allowing for diverse molecular configurations.

Question 20

Which of the following is a real-world example of the importance of hydrogen bonds in biology?

Accepted Answer

Hydrogen bonds allow water to move up plant stems via capillary action.

Fundamentals of General Biology: Atoms, Molecules, and Water Properties

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