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Chemistry Exam 3 Review Flashcards | StudBud
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Chemistry Exam 3 Review
Chemistry Exam 3 Review
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Review for exam 3
Flashcards
36 cards
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Practice quiz
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Questions
36
Answers
1
What is the typical charge of a Na atom when it is bound in a molecule (NaCl)?
-2
+1
+2
-1
2
What reactant is OXIDIZED in this reaction? Zn + Pb(SO
4
) --> Pb + Zn(SO
4
)
Zn only
Zn(SO4) only
Pb only
Pb(SO4) only
3
During reduction a neutral atom's charge
decreases as it gains electrons
increases as it loses electrons
increases as it gains electrons
decreases as it loses electrons
4
What reactant is REDUCED in this reaction? Zn + Pb(SO
4
) --> Pb + Zn(SO
4
)
Zn only
Pb(SO4) only
Zn(SO4) only
Pb only
5
What is the molecular shape?
trigonal planar
octahedral
trigonal bypyramidal
tetrahedral
6
Oxidation-reduction reactions involve the
sharing of electrons
sharing of protons
transfer of electrons
transfer of protons
7
What is the shape?
trigonal planar
tetrahedral
bent
linear
8
Which shape has bond angles of 120 degrees?
tetrahedral
bent
linear
trigonal planar
9
In the Law of Conservation of Mass, if you start with 2 atoms of Cl, how many will be produced?
4
none
2
8
10
Select ALL of the signs of a chemical reaction.
Produces a solid.
Temperature change.
Color change.
Produces gas.
11
What are the products of a precipitation reaction?
Salt (aq)
Water (l)
Gas (g)
Solid (s)
12
Numbers that precede symbols and formulas in a chemical equation are called...
superscripts
fractions
coefficients
subscripts
13
In a chemical reaction, what is teh symbol for "dissolved in water?"
(g)
(s)
(aq)
(l)
14
What do you call an insoluble solid that is formed from two aqueous reactants?
reactant
inhibitor
catalyst
precipitate
15
How many valence electrons are there in NH
2
-
?
7
5 + 1(2)
5 + 1(2) + 1
8
16
What are the products of an acid base reaction?
Acid (aq)
Salt (aq)
Water (l)
Base (aq)
17
During oxidation a neutral atom's charge
decreases as it gains electrons
increases as it gains electrons
increases as it loses electrons
decreases as it loses electrons
18
Loss of electrons is known as
electron-reduction
anodising
oxidation
reduction
19
Which shape has bond angles of 109.5 degrees?
tetrahedral
trigonal planar
bent
pyramidal
20
Which has a bond angle of 180 degrees?
bent
linear
pyramidal
trigonal planar
21
Each substance to the left of the arrow in a chemical equation is called...
catalyst
reactants
inhibitor
product
22
What are the REACTANTS in this reaction? Zn + Pb(SO
4
) --> Pb + Zn(SO
4
)
Pb + Zn(SO4)
Zn + Pb(SO4)
Zn(SO4) only
Zn only.
23
3 MgCl
2
+ 2 H
3
PO
4
--> 6 HCl + ______?
aqueous Mg(PO4)2
solid Mg3(PO4)2
solid Mg(PO4)2
aqueous Mg3(PO4)2
24
What is the charge of Magnesium metal? [OR Mg (s)]
+2
+1
0
-1
25
How many valence electrons are there in a molecule of NH
4
+
?
0
5 + 1(4) - 1
8
9
26
Gain of electrons is known as
anodising
electron-reduction
oxidation
reduction
27
3 MgCl
2
+ 2 H
3
PO
4
--> 6 HCl + __ Mg
3
(PO
4
)
2
? (coefficient)
2
1
3
6
28
How many valence electrons are there in an atom of P?
5
3
0
4
29
Each substance to the right of the arrow in a chemical equation is called the...
reactant
product
inhibitor
catalyst
30
What are the PRODUCTS in this reaction? Zn + Pb(SO
4
) --> Pb + Zn(SO
4
)
Zn + Pb(SO4)
Pb + Zn(SO4)
Zn(SO4) only
Zn only.
31
What type of molecular geometry is this?
trigonal planar
tetrahedral
linear
bent
32
A bond formed between two atoms based solely on opposite charge of an ion is a(n)
covalent bond
ionic bond
metallic bond
33
A bond formed between two atoms based upon a sharing of a pair of electrons is a(n)
metallic bond
covalent bond
ionic bond
34
What type of molecular geometry is this?
trigonal bypyramidal
octahedral
tetrahedral
trigonal planar
35
How many valence electrons are there in a molecule of CCl
4
?
24
30
32
28
36
What coefficients would you add to balance the following equation?
2, 1, 2
1, 1, 1
1, 1, 2
2, 1, 1
