Mastering Biology ch 2,3,4,5 study aid
Exam questions and answers
ch 2 - Answer -
A substance that cannot be broken down into other substances by ordinary chemical
procedures is a(n) ________. - Answer -element
Which of the following is a trace element required by most living organisms? - Answer -
magnesium
The innermost electron shell of an atom can hold up to _______ electrons. - Answer -2
Which of these relationships is true of an uncharged atom? - Answer -The number of
protons is equal to the number of electrons
What determines the types of chemical reactions that an atom participates in? - Answer
-The number of electrons in the outermost electron shell
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
- Answer -6
Which of these refers to atoms with the same atomic number but different atomic
masses? - Answer -These atoms are isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does
fluorine have? - Answer -10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many protons does boron have? - Answer -5
What is the mass number of an ion with 107 electrons, 157 neutrons, and a +1 charge?
- Answer -265
Which of the following subatomic particles always has a positive charge? - Answer -
proton
Changing the number of _______ would change an atom into an atom of a different
element - Answer -protons in an atom
, The atoms of different phosphorus isotopes ___________. - Answer -have different
numbers of neutrons
The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the
following is a correct statement concerning nitrogen? - Answer -The nitrogen atom has
a mass number of 14 and an atomic mass of approximately 14 daltons
One difference between carbon-12 is that carbon-14 has - Answer -two more neutrons
than carbon-12
The atomic number of nitrogen is 7. Nitrogen 15 is heavier than nitrogen 14 because the
atomic nucleus of nitrogen 15 contains how many neutrons? - Answer -8
How many electrons does an atom of sulfur have in its valence shell? - Answer -6
Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic
mass of an oxygen atom? - Answer -approximately 16 daltons
Phosphorus 32, a radioactive isotope of phosphorus 31 (atomic number 15), undergoes
a form of radioactive decay whereby a neutron turns into a proton, which is retained in
the nucleus, and emits radiation in the form of an electron. What is the product of such
radioactive decay of phosphorus-32? - Answer -sulfure-32 (atomic number 16)
A covalent bond___________ - Answer -is one in which electron pairs are shared.
A(n) ______________ refers to two or more atoms held together by covalent bonds -
Answer -molecule
This carbon atom can form up to ___________ single covalent bond(s) - Answer -4
A(n) ____________ bond joins these two oxygen atoms - Answer -double covalent
The brackets are indicating a(n) _________ bond. - Answer -hydrogen
What name is given to the bond between water molecules? - Answer -hydrogen
Atoms with the same number of protons but with different electrical charges
___________. - Answer -are different ions
In salt, what is the nature of the bond between sodium and chlorine? - Answer -ionic
An ionic bond involves ________ - Answer -an attraction between ions of opposite
charge
Exam questions and answers
ch 2 - Answer -
A substance that cannot be broken down into other substances by ordinary chemical
procedures is a(n) ________. - Answer -element
Which of the following is a trace element required by most living organisms? - Answer -
magnesium
The innermost electron shell of an atom can hold up to _______ electrons. - Answer -2
Which of these relationships is true of an uncharged atom? - Answer -The number of
protons is equal to the number of electrons
What determines the types of chemical reactions that an atom participates in? - Answer
-The number of electrons in the outermost electron shell
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
- Answer -6
Which of these refers to atoms with the same atomic number but different atomic
masses? - Answer -These atoms are isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does
fluorine have? - Answer -10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many protons does boron have? - Answer -5
What is the mass number of an ion with 107 electrons, 157 neutrons, and a +1 charge?
- Answer -265
Which of the following subatomic particles always has a positive charge? - Answer -
proton
Changing the number of _______ would change an atom into an atom of a different
element - Answer -protons in an atom
, The atoms of different phosphorus isotopes ___________. - Answer -have different
numbers of neutrons
The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the
following is a correct statement concerning nitrogen? - Answer -The nitrogen atom has
a mass number of 14 and an atomic mass of approximately 14 daltons
One difference between carbon-12 is that carbon-14 has - Answer -two more neutrons
than carbon-12
The atomic number of nitrogen is 7. Nitrogen 15 is heavier than nitrogen 14 because the
atomic nucleus of nitrogen 15 contains how many neutrons? - Answer -8
How many electrons does an atom of sulfur have in its valence shell? - Answer -6
Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic
mass of an oxygen atom? - Answer -approximately 16 daltons
Phosphorus 32, a radioactive isotope of phosphorus 31 (atomic number 15), undergoes
a form of radioactive decay whereby a neutron turns into a proton, which is retained in
the nucleus, and emits radiation in the form of an electron. What is the product of such
radioactive decay of phosphorus-32? - Answer -sulfure-32 (atomic number 16)
A covalent bond___________ - Answer -is one in which electron pairs are shared.
A(n) ______________ refers to two or more atoms held together by covalent bonds -
Answer -molecule
This carbon atom can form up to ___________ single covalent bond(s) - Answer -4
A(n) ____________ bond joins these two oxygen atoms - Answer -double covalent
The brackets are indicating a(n) _________ bond. - Answer -hydrogen
What name is given to the bond between water molecules? - Answer -hydrogen
Atoms with the same number of protons but with different electrical charges
___________. - Answer -are different ions
In salt, what is the nature of the bond between sodium and chlorine? - Answer -ionic
An ionic bond involves ________ - Answer -an attraction between ions of opposite
charge
