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Mole Concept
What experiment did Rutherford use?
How many significant figures?
Mole Concept
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1
How many significant figures?
2
1
3
4
2
What experiment did Rutherford use?
Gold experiment
Copper experiment
Gold foil experiment
Silver foil experiment
3
What are isotopes
Two atoms with different number of neutrons
Two different types of atoms
Two atoms with different number of protons
Two atoms with different number of electrons
4
Calculate the
mass
of 500
mol
of Aluminum.
1.5 x 10-4
1.5 x 105
1.5 x 104
1.5 x 10-5
5
What are significant figures?
none
digits which contributes to the precision of that number
i dont know the exact definition
digits which cannot be written in the form of scientific notations.
6
How many
moles
are in
8200 g
of iron?
1500 mol Fe
1.5 x 102 mol Fe
1.5 x 10-2 mol Fe
1.5 mol Fe
7
Calculate the number of moles in 4.61 x 10
17
atoms of Radon.
6.77 x 10-9 mol Rn
8.56 x 10-17 mol Rn
7.66 x 10-7 mol Rn
7.66 x 107 mol Rn
8
How many significant figures?
4
1
3
2
9
1 mole is equal to
6.022 x 1024
2.066 X1024
2.066 X1023
6.022 x 1023
10
How many
sig figs
are in the measurement 0.039 g?
1
4
2
3
11
what is the atomic number?
H
1.008
1
2.1
12
Dalton's Law of Multiple Proportions says elements combine in ___
equal proportions by number
simple, whole number ratios of their masses
only one way
equal proportions by mass
13
Calculate the
mass
of
1.002 mol
of chromium.
51.10 g Cr
51 g Cr
51.1 g Cr
52 g Cr
14
What is the Law of Definite Proportions?
Elements can combine in more than one way to form compounds
Elements combine in the same ratio by mass to form compounds
Matter is neither created nor destroyed in a chem reaction
15
What is the Law of Conservation of Mass?
Matter is neither created nor destroyed in a chem reaction
Elements can combine in more than one way to form compounds
Elements combine in the same ratio by mass to form compounds
16
Who Discovered The Atomic Theory?
John A. Macdonald
Ernest Rutherford
Gloria Borger
John Dalton
17
Calculate the number of
atoms
in
0.0082 grams
of gold.
2.500 x 1019 atoms Au
2.5 x 1019 atoms Au
2.5 x 1049 atoms Au
2.499 x 1019 atoms Au
18
How many
moles
are in 0.039
grams
of palladium?
3.7 x 10-4
3.7 x 104
3.665 x 10-4
3.665 x 104
19
The hydrogen isotopes are-
protons, electrons, neutrons
#protons=1, #protons=2, #protons=3
hydrogen-1, helium-2, lithium-3
protium, deutrrium, tritium
20
Protons in Y
88.906
50
40
39
21
Calculate the number of atoms in 2.0 x 10
6
moles of Carbon
12.011 atoms C
6.022 x 1023 atoms C
2.0 x 106 atoms C
1.2 x 1030 atoms C
22
Mass in grams of a mole of a substance.
molar mass
percent composition
denisty
scientific notation
23
What is the
molar mass
of palladium?
3 g/mol
77.82 g/mol
46 g/mol
106.42 g/mol
24
Protons...
Orbit the nucleus
Are positively charged
Have no charge
Serve as a buffer
25
How many general tenets of the Dalton's Atomic Theory are there?
6
5
7
4
26
Who invented The Law of Multiple Proportions?
John Dalton
Ernest Hemingway
Schrodinger
Lavoisier
27
Chlorine-35 and Chlorine-37 are isotopes because...
same number of protons and a different number of neutrons
same element
same number of protons
different number of neutrons
28
What is the Law of Definite Proportions?
A chemical formula must always be balanced
A given compound always contains the same proportions
A given compound always contains different proportions
The ratio of the masses are always whole numbers
29
The follwing are equivalent:
1.7 e
10
and 1.7 X 10
10
False
True
30
How many significant figures?
1
4
2
3
31
How many significant figures?
3
1
2
4
32
How many
sig figs
are in 106.42?
3
4
5
2
33
The follwing are equivalent:
1750 and 1.750 X 10
-3
True
False
34
The follwing are equivalent:
1750 and 1.750 X 10
3
True
False
