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Mastering Biology Exam 1 with correct Answers
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Mastering Biology Exam 1 with correct Answers
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Mastering Biology Exam 1 with correctAnswers
mass of ~1 amu - Answer -protons and neutrons
mass of ~1/200o amu - Answer -electrons
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
The mass number of an atom is 15, and its atomic number is 7. The atom probably
has... - Answer -8 neutrons in the nucleus.
Which statement is true of atoms? - Answer -Electrons determine the atom's size.
Dr. Jones says an atom has 3 electrons in the first shell and four electrons in the
second shell. Someone should tell Dr. Jones that ... - Answer -the first shell shouldn't
have 3 electrons.
Which statement is true of the energy levels of electrons in shells? - Answer -The
valence shell has higher energy than other occupied shells.
Which statement is true of the atom shown in the diagram? - Answer -*An electron will
move from the outer to the inner shell.
* The atom has more than one valence electron.
*The atom is in the excited state.
*All of the above.
Two atoms always represent the same element if they have ... - Answer -the same
number of protons.
An atom has 6 electrons, 6 protons, and 6 neutrons. You can tell that this atom belongs
to the element _____ because _____________________. - Answer -C; it has 6 protons.
, An atom has 8 protons, 8 neutrons, and 8 electrons. Another isotope of the same
element might have ... - Answer -10 neutrons.
Radioactive decay is likely to occur when ... - Answer -an atom has too many neutrons.
Which model most accurately represents the current view of the structure of the atom? -
Answer -Probability model
Which statement is most useful in explaining why chemists assign atoms to chemical
elements by counting protons?
*99% of the atom's mass consists of protons.
*The nucleus doesn't change in stable isotopes.
*The proton's negative charge holds electrons in the atom.
*Protons at the atom's surface determine the atom's behavior.
*None of these. Elements are defined by the number of protons. - Answer -None of
these. Elements are defined by the number of protons.
What type of bond is joining the two hydrogen atoms? - Answer -covalent
A(n) _____ refers to two or more atoms held together by covalent bonds. - Answer -
molecule
This atom can form up to _____ single covalent bond(s). - Answer -4
A(n) _____ bond joins these two oxygen atoms. - Answer -double covalent
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
What is the result of the animated process? - Answer -a positively charged sodium ion
and a negatively charged chlorine ion
An ionic bond involves _____. - Answer -an attraction between ions of opposite charge
Which of these figures correctly illustrates the nature of the bonding of H2O? - Answer -
What type of bond joins the carbon atom to each of the hydrogen atoms? - Answer -
single (nonpolar) covalent
The brackets are indicating a(n) _____ bond. - Answer -hydrogen
What name is given to the bond between water molecules? - Answer -hydrogen
Hydrogen bonding - Answer -
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