Q: Which of the following equations correctly represents the process of photosynthesis?

$$CO_2 + H_2O$$ \rightarrow C_6H_{12}$$O_6$$ + $$O_2$$ \text{ (in the presence of sunlight)}$

Question 1

Which of the following best explains why water is able to moderate temperature so effectively in living organisms?

Accepted Answer

Water has a high specific heat capacity due to hydrogen bonding, allowing it to absorb or release large amounts of heat with only slight temperature change.

Question 2

A sodium atom (Na) has one electron in its outermost shell. When it reacts with a chlorine atom (Cl), what type of bond is formed and what happens to the electrons?

Accepted Answer

An ionic bond is formed; sodium donates its outer electron to chlorine, resulting in oppositely charged ions.

Question 3

Which property of water allows plants to transport water from their roots to their leaves against gravity?

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 4

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of pairs of valence electrons between atoms.

Question 5

Why does ice float on liquid water, and what would be the consequence if it did not?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds form a lattice that spaces molecules apart; if ice sank, bodies of water would freeze solid, threatening life.

Question 6

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges on the atoms.

Question 7

A molecule of water (H$$_2O) is $$described as a polar molecule. Which feature of its structure is responsible for this property?

Accepted Answer

The bent shape and the higher electronegativity of oxygen compared to hydrogen

Question 8

Which of the following is a real-world example of van der Waals interactions being used by an organism?

Accepted Answer

The ability of gecko toes to stick to walls due to many tiny hairs maximizing surface contact

Question 9

Which of the following equations correctly represents the process of photosynthesis?

Accepted Answer

$$CO_2 + H_2O$$ ightarrow C_6H_{12}$$O_6$$ + $$O_2$$ 	ext{ (in the presence of sunlight)}$

Question 10

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil molecules are nonpolar and cannot form hydrogen bonds with polar water molecules.

Question 11

A scientist is studying a new element with 7 electrons. According to the electron distribution diagram, how many electrons are in its outermost shell, and what does this imply about its reactivity?

Accepted Answer

It has 5 electrons in its outermost shell (after filling the first shell with 2); it is reactive and tends to gain electrons.

Question 12

Which of the following best describes the role of hydrogen bonds in the properties of water?

Accepted Answer

Hydrogen bonds are responsible for water's high cohesion, surface tension, and its ability to expand upon freezing.

Question 13

Which of the following scenarios demonstrates the concept of evaporative cooling?

Accepted Answer

Sweat evaporating from human skin, carrying away heat and cooling the body

Question 14

Which of the following is true about the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 15

Which of the following best describes the relationship between an atom's valence electrons and its chemical reactivity?

Accepted Answer

Atoms with incomplete valence shells tend to be more reactive as they seek to complete their outer shell.

Question 16

A patient is given a synthetic drug that mimics the shape of a natural hormone. Which property of molecules allows the drug to bind to the same receptor as the hormone?

Accepted Answer

The drug and hormone have complementary molecular shapes, allowing them to fit into the receptor.

Question 17

Which of the following best explains why salt (NaCl) dissolves easily in water?

Accepted Answer

Water's polarity allows it to surround and separate the positive and negative ions of salt.

Question 18

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

Accepted Answer

Combining hydrogen and oxygen to form water: $$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 19

Which of the following statements about the domains of life is correct?

Accepted Answer

Bacteria, Archaea, and Eukarya are the three domains of life.

Foundations of Chemistry in Biology: Atoms, Bonds, and Water

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