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WorksheetsLecture 3 UPI
Total questions: 11
Worksheet time: 4mins
Name
Class
Date
1.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
2.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
3.
Why the lime water turn into cloudy when copper(II) carbonate is heated?
a)
Formation of CuO
b)
H2 gas release
c)
CO2 gas release
d)
Formation of CaCO3
4.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
5.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
6.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Avogadro's Number
7.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
8.
When you use a balanced chemical equation to calculate the amount of a product on paper it is referred to as the
a)
experimental value
b)
theoretical value
c)
true amount
d)
percent yield
9.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Matter cannot be created or destroyed, merely rearranged
d)
None of these
10.
Yellow precipitate produced during the reaction of lead(II) nitrate and potassium iodide is
a)
potassium nitrate
b)
lead(II) iodide
c)
lead
d)
potassium
11.
The white fumes are produced at the end mouth of W-tube. What it is?
a)
HCl
b)
NH3
c)
NH4Cl
d)
NH4
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