Question 1

Which of the following best illustrates the concept of 'emergent properties' as seen in the formation of sodium chloride from its elements?

Accepted Answer

Sodium chloride exhibits properties that are different from both sodium and chlorine.

Question 2

According to Table 2.1, which element makes up the largest percentage of body mass in humans?

Accepted Answer

Oxygen

Question 3

Which of the following is a trace element in the human body, present at less than 0.01% of body mass?

Accepted Answer

Zinc

Question 4

A patient is diagnosed with an iodine deficiency. Which of the following best explains the biological significance of this trace element?

Accepted Answer

Iodine is essential for thyroid hormone production.

Question 5

Which of the following statements about electron shells is correct?

Accepted Answer

Electrons in the outermost shell are called valence electrons.

Question 6

Which type of chemical bond is formed when atoms share electrons equally?

Accepted Answer

Non-polar covalent bond

Question 7

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 8

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom and an electronegative atom such as oxygen or nitrogen.

Question 9

Van der Waals forces are important in biological systems because:

Accepted Answer

They can collectively provide significant stability when many are present.

Question 10

Which of the following molecules is an example of a compound formed by ionic bonds?

Accepted Answer

Sodium chloride ($$NaCl)$$

Question 11

A chemical reaction is at equilibrium when:

Accepted Answer

The forward and reverse reaction rates are equal.

Question 12

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

Accepted Answer

$$N_2 + 3H_2$$ \rightarrow 2NH_3$$ (releases heat energy)

Question 13

Which property of water is primarily due to hydrogen bonding?

Accepted Answer

Its high specific heat capacity.

Question 14

Morphine can bind to endorphin receptors because:

Accepted Answer

Its molecular shape mimics the binding portion of endorphins.

Question 15

Which of the following best explains why molecular shape is critical in biological interactions?

Accepted Answer

Molecular shape allows molecules to fit and interact with specific receptors.

Question 16

If an atom has 7 electrons, how many electrons are in its outermost shell?

Accepted Answer

5

Question 17

Which of the following elements is NOT a major component of the human body?

Accepted Answer

Boron

Question 18

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges.

Question 19

Which element is most likely to form four covalent bonds in biological molecules?

Accepted Answer

Carbon

Question 20

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

Accepted Answer

Polar covalent bonds

Chapter 2: The Chemical Context of Life – Study Notes

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