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Review: Types of Chemical Reactions, Stoichiometry Flashcards | StudBud
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Review: Types of Chemical Reactions, Stoichiometry
Review: Types of Chemical Reactions, Stoichiometry
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Review of: Types of Chemical Reactions Stoichiometry
Flashcards
38 cards
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Questions
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Answers
1
Where can you
find
the mole ratio?
the unbalanced chemical equation
the subscripts in a formula
the balanced chemical equation
the periodic table
2
_C
6
H
12
O
6
(s) + _O
2
(g) --> _CO
2
(g) + _H
2
O(l) Which coefficients should be placed in the blanks to balance this equation?
1,6,6,6
6,1,6,1
3,3,3,6
3,1,3,1
3
What type of reaction is in this picture?
Double Displacement
Single Displacement
Synthesis
Decomposition
4
Which element has the most atoms per mole, Chlorine or Gold?
Both the same
Gold
Can't tell, need more information
Chlorine
5
A mole ratio is derived from the _______ of the balanced chemical equation.
subscripts
superscripts
coefficients
compounds
6
What type of reaction is in this picture?
Single Displacement
Synthesis
Decomposition
Double Displacement
7
Percent yield of a reaction is 74%. Actual yield is 1.3 g. What was the theoretical yield?
0.96 g
0.017 g
1.8 g
0.57 g
8
To convert from moles to mass you ______ by the molar mass.
divide
multiply
add
subtract
9
would actual yield be ever bigger than theoretical yield?
Sometimes
Maybe
No, Never
Yes, always
10
You have 273 moles of Silicon. What is the mass of the silicon?
7777.8 grams of silicon
You have silicon... obviously
70009.1111 grams of silicon
7667.5 grams of silicon
11
what is the law of conversion of mass
products
particles
total mass reactant = total mass product
product/ molar mass
12
A mole is _________ number of representative particles.
Avogadro's
Thomson's
Rutherford's
Einstein's
13
What is the molecular mass of
KOH
?
33 g/mol
56 g/mol
62 g/mol
40 g/mol
14
What happens when the limiting reactant runs out?
The reaction stops
The reaction reverses and starts making more reactants
The excess reactant takes over
A hole in the space-time fabric opens and sucks in the Earth
15
What type of reaction is in this picture?
Double Displacement
Decomposition
Single Displacement
Synthesis
16
The mass number of an element represents:
# of protons
# of protons and neutrons
# of electrons
# of neutrons
17
The atomic mass of an element is the _____.
Average of the mass number and atomic number for the element
Total mass of the isotopes of the element
Weighted average of masses of the isotopes of the element
Total number of subatomic particles in its nucleus
18
In theory 4.50 g of water is produced. They actually produced 3.4 g. Calculate the percent yield.
14
17
76
1.3
19
The theoretical yield of a chemical reaction is
the max. amount of product formed by an experiment
guessing
the min. amount of product formed in a laboratory
the max. amount of product formed ideally
20
What type of reaction is in this picture?
Decomposition
Synthesis
Double Displacement
Single Displacement
21
How many atoms are in one mole?
6.022x10
6.022x10^24
6.022x10^23
22
what's the molar mass of Ca?
40.08g /mol
40.08g
40.1g
40. 1g / mol
23
What is the percent by mass of oxygen in Na
2
O?
33.3%
25.8 %
41.0%
50%
24
Zn(s) + 2HCl(aq) --> ZnCl
2
(aq) + H
2
(g) -- What is the Theoretical Yield of H
2
from 5 mol Zn and unlimited HCl?
297 g
182 g
10.1 g
5.05 g
25
Percent yield of a reaction is 61%. Theoretical yield was 5.9 g. What was the actual yield?
4.7 g
9.6 g
3.6 g
0.13 g
26
Percent yield is found by taking the actual yield and _______ by the theoretical yield x 100.
subtracting
multiplying
adding
dividing
27
What is the molar mass of O?
16.0g/mol
40.3g/mol
24.3g/mol
28
What is the volume of 1.00 mole of any gas at STP?
2.24 × 10 23 L
None of the above
6.02 × 10 23 L
22.4 L
29
What is theoretical yield?
The actual amount of products obtained
The estimated amount of products obtained
The actual amount of moles used for the reaction
The amount of reactants you intend to use
30
2NBr
3
+ 3NaOH --> N
2
+ 3NaBr + 3HOBr If there are 40 mol of NBr
3
and 48 mol of NaOH, what is the excess reactant?
HOBr
NBr3
N2
NaOH
31
what is a molar mass?
founder of mole
g/mol
mass of one mole of a pure substance
it is one negatively charged particle
32
6.57 g of Fe react with excess HCl. 11.2 g of FeCl
2
are obtained. Calculate the percent yield.
86.8%
75.1%
25.2%
51.8%
33
If the actual yield is 5.62 g, and the theoretical yield is 6.14 g, what is the percent yield?
109%
0.915%
91.5%
91.53%
34
What type of reaction is in this picture?
Single Displacement
Synthesis
Decomposition
Combustion
35
What roles do the mole, Avogadro's number and molar mass play in stoichiometric calculations?
just three things without relationships
the basis for relating masses in grams to numbers of atoms.
make the calculation and data more precise and accurate.
36
Define Percent Composition
A liquid mixture in which the minor component is uniformly
The amount of solute in a solution
The percentage by mass of each element in a compound
37
theoretical yield of producing KNO
3
was 40.5g if the percent yield was 78%. The actual yield is
45.4g
31.6g
40.4g
37.6g
38
You have 88 grams of potassium. What is the mole of the potassium?
This ain't math class
Why are you making me do this?
2.25 moles of potassium
2.25 moles of platinum
