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

$$6 \text{CO}_2 + 6 \text{H}_2\text{O} \xrightarrow{\text{sunlight}} \text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2$$

Question 1

Which of the following best explains why sodium chloride (NaCl) has properties different from both sodium metal and chlorine gas?

Accepted Answer

NaCl is a compound with emergent properties resulting from the fixed ratio and bonding of sodium and chlorine atoms.

Question 2

A radioactive isotope is used as a tracer in a PET scan to monitor cancer growth. Which property of radioactive isotopes makes this possible?

Accepted Answer

They decay spontaneously, emitting particles and energy that can be tracked.

Question 3

Which of the following statements about electron shells and energy levels is correct?

Accepted Answer

Electrons absorb or lose energy in fixed amounts when moving between shells.

Question 4

A patient is injected with a radioactive isotope for a diagnostic test. After 12 hours, only 25% of the original isotope remains. If the half-life of the isotope is 6 hours, how many half-lives have passed?

Accepted Answer

$$2$$

Question 5

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 6

Which element is most likely to form four covalent bonds with other atoms?

Accepted Answer

Carbon

Question 7

A molecule of water (H$$_2O) is $$described as polar. What is the main reason for this polarity?

Accepted Answer

Oxygen is more electronegative than hydrogen, causing unequal sharing of electrons.

Question 8

Which of the following is a trace element essential for human life, as listed in Table 2.1?

Accepted Answer

Iron

Question 9

If an atom has an atomic number of 7 and a mass number of 15, how many neutrons does it have?

Accepted Answer

$$8$$

Question 10

Which of the following best explains why noble gases like neon are chemically inert?

Accepted Answer

They have a full valence shell of electrons.

Question 11

Which type of weak chemical interaction is responsible for the ability of a gecko to climb smooth surfaces?

Accepted Answer

Van der Waals interactions

Question 12

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

Accepted Answer

$$6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} \xrightarrow{	ext{sunlight}} 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2$$

Question 13

Which statement about chemical equilibrium is correct?

Accepted Answer

At equilibrium, the forward and reverse reactions occur at the same rate.

Question 14

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

Accepted Answer

Valence electrons determine the chemical behavior and bonding capacity of an atom.

Question 15

A sodium atom transfers an electron to a chlorine atom. What type of ions are formed, and what is the resulting compound?

Accepted Answer

Na$$^+ ($$cation) and Cl$$^- ($$anion); the compound is NaCl

Question 16

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule

Question 17

Which property of water is primarily responsible for its ability to dissolve many ionic compounds?

Accepted Answer

Its polarity, which allows it to surround and separate ions

Question 18

Which of the following best describes the relationship between atomic number, mass number, and isotopes?

Accepted Answer

Isotopes have the same atomic number but different mass numbers due to varying numbers of neutrons.

Question 19

Which of the following is a real-world application of van der Waals interactions?

Accepted Answer

A gecko climbing a wall due to the collective strength of many weak interactions

Chemical Context of Life: Foundations for Anatomy & Physiology

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