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Mastering Biology Exam 1 Questions and Answers Fully Solved
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Mastering Biology Exam 1
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Mastering Biology Exam 1mass 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. - 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? - 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... - answer8 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 ... - answer10 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). - answer4
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
**water molecules cling to plant cell walls
*water molecules clinging to the side of a beaker - answer Adhesion
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