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Chem21 Midterm Review
Chem21 Midterm Review
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A midterm review Quiz for Chemistry
Flashcards
30 cards
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Practice quiz
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Host live
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Questions
30
Answers
1
How many electrons does this atom have?
17
18
16
-1
2
What would be the charge of the most common ion of Br?
+7
-7
+1
-1
3
What is a mole in Chemistry?
A huge number to count small particles
A furry animal that digs holes
The mass of an atom
A small number to count huge particles
4
Which of these states of matter has the most entropy?
Gooey
Liquid
Solid
Gas
5
How many neutrons are in this atom of Magnesium?
25
37
13
12
6
Compared to a chlorine (Cl) atom, a sodium (Na) atom has a larger:
Ionization Energy
Number of Electrons
Coulombic Attraction
Radius
7
Which of these ground-state orbital diagrams is correct?
b
c
a
All are incorrect
8
How many valence electrons are in the halogens (Group 17)?
17
1
7
5
9
How many neutrons are there in one atom of Carbon-14?
6
14
12
8
10
What is the molar mass of Oxygen (O)?
16 g/mole
3.44 g/mole
-2 g/mole
8 g/mole
11
Which one of these is the most electronegative?
Boron (B #5)
Lithium (Li #3)
Oxygen (O #8)
Sulfur (S #16)
12
How many grams are in 3 moles of H
2
O?
6 grams
18 grams
54 grams
3 grams
13
How many moles of O
2
is in a 80.0 gram sample of O
2
?
0.40
2.5
0.20
5.0
14
For the above reaction, how many grams of water will you get if 16 grams of O
2
is used?
13 g
40 g
0.8 g
7.2 g
15
Which of these states of matter has the strongest Intermolecular Forces?
Gas
Liquid
Gooey
Solid
16
What are the coefficients when you balance this equation: __CuCl
2
+ __Al --> __Cu + __AlCl
3
6, 4, 6, 4
2, 3, 3, 2
3, 2, 3, 2
1, 2, 1, 2
17
Element, Compound, or Mixture?
Mixture
Element
None of the above
Compound
18
Which one has the highest ionization energy?
Sodium (Na #11)
Magnesium (Mg #12)
Aluminum (Al #13)
Gallium (Ga #31)
19
What is an isotope?
Two atoms with different number of protons and neutrons
Two atoms with the same number of protons but different electrons
Two atoms with the same number of protons but different neutrons
Two atoms with different number of protons
20
Complete Electron Configuration of a neutral atom of Na is
3s1
1s2 2s2 2p6 3s1
1s2 2s1
1s2 1p62s2 2p6 3s1
21
If 20 grams of sugar is dissolved in 80 grams of water, the concentration of the solution is:
80 pph
20 pph
4 pph
25 pph
22
Which one of the following phase changes is exothermic?
Vaporization
Condensation
Sublimation
Melting
23
Which one will have the largest number of atoms?
They all all have the same number of atoms
4.0 g of He atoms
20,0 g of Ne atoms
1.01 g of H atoms
24
The Noble Gas Configuration for the most common ion of Bromine (Br) is
[Ar]
[Kr]
[Ar] 3d104p4
[Ar] 4s2 3d104p5
25
Electron Configuration of the most common
ion
of Na is
1s2 2s2 2p6 3s1
1s2 2s2 2p6
1s2 2s2 2p5
1s2 2s2 2p6 3s2
26
What is the molar mass of Mg(NO
3
)
2
?
54 g/mole
132 g/mole
148 g/mol2
172 g/mole
27
Which of these elements is the most unreactive?
Aluminum (Al#13)
Argon (Ar#18)
Chlorine (Cl#17)
Sodium (Na#11)
28
How many moles of CO
2
will you get from 15 moles of O
2
?
3 moles
25 moles
9 moles
15 moles
29
What will happen when a seed crystal is added to an unsaturated solution?
It will make all the dissolved solute to crystallize
It will sink to the bottom
It will get dissolved
It will explode
30
What is the chemical formula for this particle diagram?
6X
X6
3X2
2X3
