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Mastering Biology ch 2,3,4,5 study aid Questions and Answers 100% Solved
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Mastering Biology ch 2,3,4,5 study aidCh
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. - answer2
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? -
answerThe 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?
- answer6
Which of these refers to atoms with the same atomic number but different atomic
masses? - answerThese atoms are isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does
fluorine have? - answer10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many protons does boron have? - answer5
What is the mass number of an ion with 107 electrons, 157 neutrons, and a +1 charge?
- answer265
Which of the following subatomic particles always has a positive charge? -
answerproton
Changing the number of _______ would change an atom into an atom of a different
element - answerprotons in an atom
, The atoms of different phosphorus isotopes ___________. - answerhave 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? - answerThe 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 - answertwo 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? - answer8
How many electrons does an atom of sulfur have in its valence shell? - answer6
Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic
mass of an oxygen atom? - answerapproximately 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? - answersulfure-32 (atomic number 16)
A covalent bond___________ - answeris one in which electron pairs are shared.
A(n) ______________ refers to two or more atoms held together by covalent bonds -
answermolecule
This carbon atom can form up to ___________ single covalent bond(s) - answer4
A(n) ____________ bond joins these two oxygen atoms - answerdouble covalent
The brackets are indicating a(n) _________ bond. - answerhydrogen
What name is given to the bond between water molecules? - answerhydrogen
Atoms with the same number of protons but with different electrical charges
___________. - answerare different ions
In salt, what is the nature of the bond between sodium and chlorine? - answerionic
An ionic bond involves ________ - answeran attraction between ions of opposite charge
A carbon atom and a hydrogen atom form what type of bond in a molecule? -
answernonpolar covalent bond
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