CHEMISTRY 115 EXAM 1 QUESTIONS WITH LATEST AND
UPDATED SCORE.
What is chemistry? -- Answer ✔✔ it is the study of matter and energy
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Significant figures -- Answer ✔✔ all the numbers we can make in a measurement, plus 1
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as an estimate. Tells the accuracy of the tool measuring.
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Precision -- Answer ✔✔ how close successive measurements are to each other
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Accuracy -- Answer ✔✔ how close measurements are to the true value
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Atom (describe it) -- Answer ✔✔ it is mostly empty space. There is a very dense nucleus
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with protons and neutrons. This is where most of the mass is located and it is positively
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charged. Outside of the nucleus are a diffuse region of electrons with a negative charge.
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Element -- Answer ✔✔ type of matter composed only of one type of atom
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Atomic number (Z) -- Answer ✔✔ the number of protons in the nucleus of an atom.
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(this is also the # of electrons if the atom is neutral)
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Mass number (A) -- Answer ✔✔ total # of protons and neutrons
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Atomic mass -- Answer ✔✔ the mass of an atom in amu. IT comes from protons,
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neutrons, and electrons. It is determined by taking the average of all the masses of that
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atom, including all relevant isotopes.
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Isotopes -- Answer ✔✔ atoms with different #'s of neutrons, but same # of protons
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Chemical properties of elements are determined by -- Answer ✔✔ the number of
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electrons and protons _ _
, Ion -- Answer ✔✔ charged particle formed by either loss or gain of electrons
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Anion -- Answer ✔✔ when an atom gains electrons becoming negatively charged
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Cation -- Answer ✔✔ when an atom looses electrons and becomes positively charged
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Horizontal rows in the periodic table are called? -- Answer ✔✔ periods
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Vertical columns in the periodic table are called? -- Answer ✔✔ groups or families
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(elements in groups behave chemically similar) _ _ _ _ _
What are the three categories of elements on the periodic table? -- Answer ✔✔ metals,
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non-metals, metalloids _
Radioactivity -- Answer ✔✔ spontaneous emission of particles and or radiation (energy
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being moved from one place to another)
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Radiation -- Answer ✔✔ the emission and transmission of energy through space in the
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form of particles or waves
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Alpha particle -- Answer ✔✔ the nucleus of a helium 4 atom
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Beta particle -- Answer ✔✔ generic term given for electrons that are ejected or emitted
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
from a nucleus.
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- there is beta minus which is an electron
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- there is beta plus which is a positron (anti-electron)
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Gamma Ray -- Answer ✔✔ electromagnetic radiation in the gamma-ray region of the
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spectrum
Nuclear transmutation -- Answer ✔✔ forced nuclear reaction resulting from
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bombardment of high energy particles _ _ _ _
UPDATED SCORE.
What is chemistry? -- Answer ✔✔ it is the study of matter and energy
_ _ _ _ _ _ _ _ _ _ _ _ _
Significant figures -- Answer ✔✔ all the numbers we can make in a measurement, plus 1
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
as an estimate. Tells the accuracy of the tool measuring.
_ _ _ _ _ _ _ _ _
Precision -- Answer ✔✔ how close successive measurements are to each other
_ _ _ _ _ _ _ _ _ _ _
Accuracy -- Answer ✔✔ how close measurements are to the true value
_ _ _ _ _ _ _ _ _ _ _
Atom (describe it) -- Answer ✔✔ it is mostly empty space. There is a very dense nucleus
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
with protons and neutrons. This is where most of the mass is located and it is positively
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
charged. Outside of the nucleus are a diffuse region of electrons with a negative charge.
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Element -- Answer ✔✔ type of matter composed only of one type of atom
_ _ _ _ _ _ _ _ _ _ _ _ _
Atomic number (Z) -- Answer ✔✔ the number of protons in the nucleus of an atom.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
(this is also the # of electrons if the atom is neutral)
_ _ _ _ _ _ _ _ _ _ _
Mass number (A) -- Answer ✔✔ total # of protons and neutrons
_ _ _ _ _ _ _ _ _ _ _
Atomic mass -- Answer ✔✔ the mass of an atom in amu. IT comes from protons,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
neutrons, and electrons. It is determined by taking the average of all the masses of that
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
atom, including all relevant isotopes.
_ _ _ _
Isotopes -- Answer ✔✔ atoms with different #'s of neutrons, but same # of protons
_ _ _ _ _ _ _ _ _ _ _ _ _ _
Chemical properties of elements are determined by -- Answer ✔✔ the number of
_ _ _ _ _ _ _ _ _ _ _ _ _
electrons and protons _ _
, Ion -- Answer ✔✔ charged particle formed by either loss or gain of electrons
_ _ _ _ _ _ _ _ _ _ _ _ _
Anion -- Answer ✔✔ when an atom gains electrons becoming negatively charged
_ _ _ _ _ _ _ _ _ _ _
Cation -- Answer ✔✔ when an atom looses electrons and becomes positively charged
_ _ _ _ _ _ _ _ _ _ _ _
Horizontal rows in the periodic table are called? -- Answer ✔✔ periods
_ _ _ _ _ _ _ _ _ _ _
Vertical columns in the periodic table are called? -- Answer ✔✔ groups or families
_ _ _ _ _ _ _ _ _ _ _ _ _ _
(elements in groups behave chemically similar) _ _ _ _ _
What are the three categories of elements on the periodic table? -- Answer ✔✔ metals,
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
non-metals, metalloids _
Radioactivity -- Answer ✔✔ spontaneous emission of particles and or radiation (energy
_ _ _ _ _ _ _ _ _ _ _ _
being moved from one place to another)
_ _ _ _ _ _
Radiation -- Answer ✔✔ the emission and transmission of energy through space in the
_ _ _ _ _ _ _ _ _ _ _ _ _ _
form of particles or waves
_ _ _ _
Alpha particle -- Answer ✔✔ the nucleus of a helium 4 atom
_ _ _ _ _ _ _ _ _ _ _
Beta particle -- Answer ✔✔ generic term given for electrons that are ejected or emitted
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
from a nucleus.
_ _
- there is beta minus which is an electron
_ _ _ _ _ _ _ _ _
- there is beta plus which is a positron (anti-electron)
_ _ _ _ _ _ _ _ _
Gamma Ray -- Answer ✔✔ electromagnetic radiation in the gamma-ray region of the
_ _ _ _ _ _ _ _ _ _ _ _ _
spectrum
Nuclear transmutation -- Answer ✔✔ forced nuclear reaction resulting from
_ _ _ _ _ _ _ _ _ _
bombardment of high energy particles _ _ _ _
