Question 1

Which of the following best describes a compound?

Accepted Answer

A substance formed when two or more different elements join together by chemical bonds

Question 2

What is the main reason oxygen is the most common element in the human body?

Accepted Answer

Oxygen's high electronegativity drives chemical reactivity and polarity, which are essential for water structure and biochemical reactions

Question 3

Which of the following statements about atoms is correct?

Accepted Answer

Atoms are the smallest unit of matter that retain the properties of an element

Question 4

If two atoms have a large difference in electronegativity, what type of bond are they most likely to form?

Accepted Answer

Ionic bond

Question 5

Which of the following best explains why water (H$$_2O) is a $$polar molecule?

Accepted Answer

Oxygen has a much higher electronegativity than hydrogen, causing unequal sharing of electrons

Question 6

What is the valence (bonding capacity) of nitrogen?

Accepted Answer

$$3$$

Question 7

Which of the following is true about covalent bonds?

Accepted Answer

They are generally stronger than ionic bonds in biological systems

Question 8

A molecule of methane (CH$$_4) $$contains how many single covalent bonds?

Accepted Answer

$$4$$

Question 9

Which of the following best describes an element?

Accepted Answer

A substance that consists of only one type of atom and is identified by its atomic number

Question 10

What determines the chemical behavior of an atom?

Accepted Answer

The number of valence electrons in the outermost shell

Question 11

Which of the following is an example of an emergent property?

Accepted Answer

The ability of sodium chloride (NaCl) to dissolve in water, even though sodium and chlorine alone are highly reactive

Question 12

Which of the following statements about potential energy in atoms is correct?

Accepted Answer

Electrons farther from the nucleus have higher potential energy

Question 13

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom

Question 14

Which of the following scenarios would most likely result in a nonpolar covalent bond?

Accepted Answer

A bond between two atoms with similar or identical electronegativities

Question 15

If an atom has 6 protons, 6 neutrons, and 6 electrons, what element is it?

Accepted Answer

Carbon

Question 16

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other

Question 17

Which of the following is true about the periodic table and atomic structure?

Accepted Answer

Elements in the same column have similar chemical properties due to similar valence electron configurations

Question 18

Which of the following is a real-world example of how chemical bonding is important for biology?

Accepted Answer

Wood ants (Formica rufa) use chemistry to ward off enemies by producing formic acid

Question 19

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons determine the bonding capacity of an atom

Question 20

Which of the following best describes the relationship between atomic number and element identity?

Accepted Answer

The atomic number is the number of protons in the nucleus and uniquely identifies the element

Introduction to Matter, Atoms, and Chemical Bonds (General Biology, Chapter 2)

Study Guide - Practice Questions