Question 1

Which of the following statements best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is two or more atoms bonded together, while a compound is a molecule that contains at least two different types of elements.

Question 2

Which subatomic particle determines the atomic number of an element?

Accepted Answer

Proton

Question 3

If a lithium atom has an atomic number of 3 and an atomic mass of 7, how many neutrons does it have?

Accepted Answer

$$7 - 3 = 4$$ neutrons

Question 4

Which property of water is primarily responsible for its ability to moderate temperature in living organisms?

Accepted Answer

High specific heat

Question 5

What type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 6

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice are more ordered, making ice less dense than liquid water.

Question 7

Which emergent property of water allows insects to walk on its surface?

Accepted Answer

High surface tension due to cohesion

Question 8

A sodium atom transfers an electron to a chlorine atom, forming NaCl. What type of bond is formed between sodium and chlorine?

Accepted Answer

Ionic bond

Question 9

Which of the following is true about electronegativity in covalent bonds?

Accepted Answer

Electronegativity is an atom’s attraction for the electrons in a covalent bond.

Question 10

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom in a polar covalent bond and an electronegative atom.

Question 11

Which of the following is a consequence of water’s high heat of vaporization for living organisms?

Accepted Answer

It allows for evaporative cooling, helping organisms regulate temperature.

Question 12

Which statement about carbon is correct and explains its importance in biological molecules?

Accepted Answer

Carbon’s four valence electrons allow it to form large, complex molecules by making four covalent bonds.

Question 13

Which of the following is an example of a hydrophobic substance?

Accepted Answer

Oil

Question 14

Which type of isomer is important in pharmacology because organisms are sensitive to even subtle variations in molecular structure?

Accepted Answer

Enantiomers

Question 15

Which functional group is commonly found in organic acids and is represented by the formula $$-COOH$$?

Accepted Answer

Carboxyl group

Question 16

A protein dissolves in water because it contains regions with which types of chemical groups?

Accepted Answer

Ionic and polar groups

Question 17

Which of the following best explains why noble gases do not readily form chemical bonds?

Accepted Answer

They have a full valence shell and are chemically inert.

Question 18

Which of the following is a real-world example of the biological importance of van der Waals interactions?

Accepted Answer

Temporary binding of morphine to endorphin receptors in the brain

Question 19

Which equation correctly represents the calculation of atomic mass for an atom with $$Z$$ protons and $$N$$ neutrons?

Accepted Answer

$$	ext{Atomic mass} = Z + N$$

Question 20

Which property of water is most important for the transport of nutrients and waste in plants?

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

The Chemical Context of Life: Elements, Bonds, Water, and Carbon

스터디 가이드 - 연습 문제