Question 1

Which element makes up the largest percentage of the human body by mass?

Accepted Answer

Carbon

Question 2

Which of the following best describes an atom?

Accepted Answer

The smallest unit of matter that retains the properties of an element

Question 3

What is the charge and location of a neutron in an atom?

Accepted Answer

No charge, nucleus

Question 4

Which subatomic particle is responsible for the chemical properties and reactivity of an element?

Accepted Answer

Electron

Question 5

How many electrons can a p-orbital hold?

Accepted Answer

$$6$$

Question 6

Which statement about electron orbitals is correct?

Accepted Answer

Electrons fill the lowest energy orbitals first

Question 7

What is the main difference between covalent and ionic bonds?

Accepted Answer

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

Question 8

Which type of bond is responsible for the partial charges in a water molecule?

Accepted Answer

Polar covalent bond

Question 9

What is the effect of increasing acidity (lower pH) on hemoglobin's affinity for oxygen?

Accepted Answer

It decreases hemoglobin's affinity for oxygen

Question 10

Which equation represents the reversible reaction involved in blood pH buffering?

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{H}_2\mathrm{CO}_3 \rightleftharpoons \mathrm{HCO}_3^- + \mathrm{H}^+$$

Question 11

Which property of water allows it to absorb large amounts of heat with only a slight change in temperature?

Accepted Answer

High specific heat

Question 12

What is the pH of pure water at standard conditions?

Accepted Answer

$$7$$

Question 13

Which functional group is essential for protein folding due to its ability to form disulfide bridges?

Accepted Answer

Sulfhydryl group

Question 14

Which type of hydrocarbon geometry is formed by carbon chains with only single bonds?

Accepted Answer

Tetrahedral geometry

Question 15

Why are trans fats considered unhealthy compared to cis fats?

Accepted Answer

Trans fats accumulate in the body because we lack enzymes to break them down

Question 16

Which of the following is a trace metal essential for biological processes?

Accepted Answer

Zinc

Question 17

What is the main reason carbon is ideal as the central element in organic molecules?

Accepted Answer

It can form four stable covalent bonds, allowing for diverse molecular structures

Question 18

Which type of interaction is responsible for holding together the two strands of DNA?

Accepted Answer

Hydrogen bonds

Question 19

Which statement best explains why water is a universal solvent?

Accepted Answer

Water forms hydrogen bonds with polar molecules, allowing it to dissolve many substances

Question 20

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers maintain pH by neutralizing excess acids and bases

The Chemistry of Life: Chapter 2 Study Notes

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