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Friday, Sept 17th Review Flashcards | StudBud
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Friday, Sept 17th Review
Friday, Sept 17th Review
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1
The atomic number (Z) represents...
the number of protons and neutrons in the nucleus of an atom.
the number of electrons in the nucleus of an atom.
the number of protons in the nucleus of an atom.
the number of protons and electrons in the atom.
2
Which scientific law states that
in a chemical reaction matter is neither created or destroyed
?
Law of Conservation of Mass (or Matter)
Law of Multiple Proportions
Law of Definite Proportions
Law of Constant Composition
3
JJ Thomson, Robert Millikan, and Ernest Rutherford were all philosophers who never experimented or observed matter.
True
False
4
In which experiment was the proton discovered?
Cathode Ray Tube
Oil Drop
Gold Foil
Plum Pudding
5
In discovering the existence of isotopes, which postulate of Dalton's Atomic Theory was disproved?
Atoms combine in simple, whole-number ratios.
All atoms of a given element have the same mass and other properties.
Atoms are neither created or destroyed, but are rearranged.
Atoms of one element differ in properties from atoms of all other elements.
6
How many millimeters are in 1 meter?
1000 mm
0.001 mm
10 mm
100 mm
7
Which of the following scientists were credited with discovering the electron?
Ernest Rutherford
Robert Millikan
James Chadwick
JJ Thomson
8
In which of the following numbers are NONE of the zeros significant?
0.0100 m
100.0 m
1.003450 m
0.00001
9
Calculate the (average) atomic mass of Element "X" given the following data.
39.7 amu
42.1 amu
41.5 amu
83.0 amu
10
Which of the following reports the volume to the correct number of sig figs when reading this graduated cylinder?
80. mL
82.6 mL
85 mL
82.75 mL
11
Which of the following is an isoelectronic series?
S, Cl, Ar, K
Si2-, P2-, S2-, Cl2-
F-, Cl-, Br-, I-
O2-, F-, Ne, Na+
12
Choose the best unit prefix to express 8.8 x 10
-6
L.
mega, M
centi, c
micro, μ
nano, n
13
Last year the U.S. added 17,000. megawatts of wind power to the grid.
What unit would be more appropriate to use?
gigawatts
microwatts
watts
kilowatts
14
What is the area of a 8.50 inch x 11.0 inch sheet of paper in cm
2
? Given: 1 inch = 2.54 cm
603
37
15
237
15
How many sig figs should be reported in the following computation?
4
2
3
5
16
What fraction of a meter is 1 millimeter?
1000 m
0.001 m
10-3 m
0.01 m
17
Which of the following is a cation?
Ne
Br-
Ca2+
O2
18
When an ion is formed, it always has a positive charge.
True
False
