Question 1

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 bondD) A) and C)
E) All of the above

Question 2

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 
E)  number of protons = number of electronsF) measure of molecular motionG) number of protons and neutrons in the atomic nucleusH) A) and C)
I) D) and E)

Question 3

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 isotopeF) D) and E)
G) All of the above

Question 4

​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 atomsF) C) and D)
G) A) and B)

Question 5

What is the difference between strong and weak acids?

Accepted Answer

Acids give up hydrogen ions when they di...

Question 6

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; tenF) B) and D)
G) None of the above

Question 7

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 8

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 onlyF) B) and C)
G) C) and D)

Question 9

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 releaseF) A) and D)
G) None of the above

Question 10

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 bondD) A) and C)
E) A) and B)

Question 11

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 12

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

Accepted Answer

The shell model for an uncharg...

Question 13

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.F) None of the above
G) A) and B)

Question 14

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)  eightF) B) and D)
G) All of the above

Question 15

​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)  solutionD) A) and C)
E) All of the above

Question 16

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; soluteF) C) and D)
G) A) and E)

Question 17

Hydrophobic molecules are ____ water.

Accepted Answer

A)  attracted to
B)  absorbed by
C)  repelled by
D)  suspended by
E)  dissolvable inF) None of the above
G) A) and C)

Question 18

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 onlyF) A) and B)
G) B) and D)

Question 19

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 
E)  number of protons = number of electronsF) measure of molecular motionG) number of protons and neutrons in the atomic nucleusH) C) and G)
I) D) and G)

Question 20

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 ionicF) All of the above
G) None of the above

Exam 2: Lifes Chemical Basis

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.

Correct Answer
verified

Correct Answer
verified
When ²¹⁰Po emits an alpha particl...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
The shell model for an uncharg...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Hydrophobic molecules are ____ water.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
Each of the hydrogen atoms in a water mo...
View Answer

What is the difference between strong and weak acids?

Correct Answer
verified
Acids give up hydrogen ions when they di...
View Answer

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

Correct Answer
verified

When nonionic solids dissolve in water, they ____.

Correct Answer
verified

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

Correct Answer
verified

Match the terms with their most suitable description. -neutral

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Exam 2: Lifes Chemical Basis

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.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedWhen 210Po emits an alpha particl...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedThe shell model for an uncharg...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Hydrophobic molecules are ____ water.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

​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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedEach of the hydrogen atoms in a water mo...View AnswerShow Answer

What is the difference between strong and weak acids?

Correct AnswerverifiedAcids give up hydrogen ions when they di...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

​When nonionic solids dissolve in water, they ____.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Match the terms with their most suitable description. -neutral

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct Answer
verified

Correct Answer
verified
When ²¹⁰Po emits an alpha particl...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The shell model for an uncharg...
View Answer

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Each of the hydrogen atoms in a water mo...
View Answer

Correct Answer
verified
Acids give up hydrogen ions when they di...
View Answer

Correct Answer
verified

When nonionic solids dissolve in water, they ____.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified