Question 1

A water molecule is polar but has no charge. What makes water molecules polar and how does this polarity contribute to hydrogen bonding?

Accepted Answer

Each of the hydrogen atoms in a water mo

Question 2

The atomic number is determined by the number of ____ in an atom's nucleus.

Accepted Answer

A) neutrons and protons 
B) neutrons and electrons 
C) protons and electrons 
D) protons only 
E) neutrons only 
A) neutrons and protons 
B) neutrons and electrons 
C) protons and electrons 
D) protons only 
E) neutrons only

Question 3

Hydrophobic molecules are ____ water.

Accepted Answer

A) attracted to 
B) absorbed by 
C) repelled by 
D) suspended by 
E) dissolvable in 
A) attracted to 
B) absorbed by 
C) repelled by 
D) suspended by 
E) dissolvable in

Question 4

What is the difference between strong and weak acids?

Accepted Answer

Acids give up hydrogen ions when they di

Question 5

Which type of bond is formed whenever atoms share one pair of electrons?

Accepted Answer

A) single covalent 
B) hydrogen 
C) ionic 
D) double covalent 
E) nonpolar ionic 
A) single covalent 
B) hydrogen 
C) ionic 
D) double covalent 
E) nonpolar ionic

Question 6

What is formed when an atom loses or gains an electron?

Accepted Answer

A) a new element 
B) an ion 
C) a molecule 
D) a bond 
E) an isotope 
A) a new element 
B) an ion 
C) a molecule 
D) a bond 
E) an isotope

Question 7

​When nonionic solids dissolve in water, they ____.

Accepted Answer

A) ​act as buffers 
B) ​accept hydrogen ions 
C) ​release hyddrogen ions 
D) ​do not dissociate into atoms 
E) ​dissociate into atoms 
A) ​act as buffers 
B) ​accept hydrogen ions 
C) ​release hyddrogen ions 
D) ​do not dissociate into atoms 
E) ​dissociate into atoms

Question 8

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-forms between atoms with little to no difference in electronegativity

Accepted Answer

A) ionic bond 
B) covalent bond 
C) hydrogen bond 
A) ionic bond 
B) covalent bond 
C) hydrogen bond

Question 9

​Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description.​
-the water containing dissolved salt

Accepted Answer

A) solvent 
B) solute 
C) solution 
A) solvent 
B) solute 
C) solution

Question 10

Draw a shell model of an uncharged nitrogen atom (atomic number 7).

Accepted Answer

The shell model for an uncharg

Question 11

Match the terms with their most suitable description.
-neutral

Accepted Answer

A) number of protons > number of electrons B) number of protons in the atomic nucleus C) polar; easily dissolves in water D) number of protons < number of electrons E) number of protons = number of electrons F)measure of molecular motion G)number of protons and neutrons in the atomic nucleus A) number of protons > number of electrons B) number of protons in the atomic nucleus C) polar; easily dissolves in water D) number of protons < number of electrons E) number of protons = number of electrons F)measure of molecular motion G)number of protons and neutrons in the atomic nucleus

Question 12

Match the terms with their most suitable description.
-positive charge

Accepted Answer

A) number of protons > number of electrons B) number of protons in the atomic nucleus C) polar; easily dissolves in water D) number of protons < number of electrons E) number of protons = number of electrons F)measure of molecular motion G)number of protons and neutrons in the atomic nucleus A) number of protons > number of electrons B) number of protons in the atomic nucleus C) polar; easily dissolves in water D) number of protons < number of electrons E) number of protons = number of electrons F)measure of molecular motion G)number of protons and neutrons in the atomic nucleus

Question 13

Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 82 protons and 128 neutrons. When 210Po decays, it emits an alpha particle, which is a helium nucleus (two protons and two neutrons). 210Po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. They can be stopped by, for example, a sheet of paper or a few inches of air. That is one reason that authorities failed to discover toxic amounts of 210Po in the body of former KGB agent Alexander Litvinenko until after he died suddenly and mysteriously in 2006. What element does an atom of 210Po change into after it emits an alpha particle?

Accepted Answer

When ²¹⁰Po emits an alpha particl

Question 14

When dissolved in water, a(n) _____ donates H+, while a(n) _____accepts H+.

Accepted Answer

A) acid; base 
B) base; acid 
C) buffer; solute 
D) base; buffer 
E) solvent; solute 
A) acid; base 
B) base; acid 
C) buffer; solute 
D) base; buffer 
E) solvent; solute

Question 15

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once.
-links ions of opposite charge

Accepted Answer

A) ionic bond 
B) covalent bond 
C) hydrogen bond 
A) ionic bond 
B) covalent bond 
C) hydrogen bond

Question 16

Calcium has an atomic number of 20. An atom of calcium has ____ electrons in its first energy level and ____ electrons in its second energy level.

Accepted Answer

A) two; eight 
B) four; four 
C) six; six 
D) eight; two 
E) two; ten 
A) two; eight 
B) four; four 
C) six; six 
D) eight; two 
E) two; ten

Question 17

Which statement describes the arrangement or properties of electrons in an atom?

Accepted Answer

A) Electrons furthest from the nucleus are at the lowest energy level. 
B) The first energy level can hold up to eight electrons. 
C) Electrons cannot move out of their assigned orbital space. 
D) The innermost orbital holds two electrons. 
E) At the second energy level, there are two possible orbitals with a total of eight electrons. 
A) Electrons furthest from the nucleus are at the lowest energy level. 
B) The first energy level can hold up to eight electrons. 
C) Electrons cannot move out of their assigned orbital space. 
D) The innermost orbital holds two electrons. 
E) At the second energy level, there are two possible orbitals with a total of eight electrons.

Question 18

The process by which a nucleus of an atom breaks up and emits subatomic particles and/or energy is known as ____.

Accepted Answer

A) radioactive decay 
B) radioactive isotoping 
C) electronegativity 
D) neutron release 
E) free radical release 
A) radioactive decay 
B) radioactive isotoping 
C) electronegativity 
D) neutron release 
E) free radical release

Question 19

Molecular oxygen is composed of two oxygen atoms that share four electrons. How many covalent bonds exist between the two oxygen atoms?

Accepted Answer

A) none 
B) one 
C) two 
D) four 
E) eight 
A) none 
B) one 
C) two 
D) four 
E) eight

Question 20

The mass number of an atom is determined by the number of ____.

Accepted Answer

A) neutrons and protons 
B) neutrons and electrons 
C) protons and electrons 
D) protons only 
E) neutrons only 
A) neutrons and protons 
B) neutrons and electrons 
C) protons and electrons 
D) protons only 
E) neutrons only

Exam 2: Lifes Chemical Basis

A water molecule is polar but has no charge. What makes water molecules polar and how does this polarity contribute to hydrogen bonding?

The atomic number is determined by the number of ____ in an atom's nucleus.

Hydrophobic molecules are ____ water.

What is the difference between strong and weak acids?

Which type of bond is formed whenever atoms share one pair of electrons?

What is formed when an atom loses or gains an electron?

​When nonionic solids dissolve in water, they ____.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -forms between atoms with little to no difference in electronegativity

​Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description.​ -the water containing dissolved salt

Draw a shell model of an uncharged nitrogen atom (atomic number 7).

Match the terms with their most suitable description. -neutral

Match the terms with their most suitable description. -positive charge

When dissolved in water, a(n) _____ donates H+, while a(n) _____accepts H+.

Match the chemical bond descriptions with the type of bond listed below. Each answer may be used more than once. -links ions of opposite charge

Calcium has an atomic number of 20. An atom of calcium has ____ electrons in its first energy level and ____ electrons in its second energy level.

Which statement describes the arrangement or properties of electrons in an atom?

The process by which a nucleus of an atom breaks up and emits subatomic particles and/or energy is known as ____.

Molecular oxygen is composed of two oxygen atoms that share four electrons. How many covalent bonds exist between the two oxygen atoms?

The mass number of an atom is determined by the number of ____.

The Science of Biology

Molecules of Life

Cell Structure

Ground Rules of Metabolism

Where It Starts-Photosynthesis

Releasing Chemical Energy

DNA Structure and Function

From DNA to Protein

Control of Gene Expression

How Cells Reproduce

Meiosis and Sexual Reproduction

Patterns in Inherited Traits

Human Inheritance

Biotechnology

Evidence of Evolution

Processes of Evolution

Lifes Origin and Early Evolution

Viruses, Bacteria, and Archaea

The Protists

Plant Evolution

Fungi

Animals I: Major Invertebrate Groups

Animals Ii: the Chordates

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Reproduction and Development

Animal Behavior

Population Ecology

Community Ecology

Ecosystems

The Biosphere

Human Effects on the Biosphere

Filters

When nonionic solids dissolve in water, they ____.

Imagine that you are pouring some table salt (NaCl) into a glass of water and stirring it until the salt has dissolved. Given this scenario, match the following terms with the best description. -the water containing dissolved salt

When dissolved in water, a(n) _ donates H⁺, while a(n) _accepts H⁺.

Calcium has an atomic number of 20. An atom of calcium has electrons in its first energy level and electrons in its second energy level.