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Balancing Equations
Test Description: Practice the review questions. The more you practice these questions...the more prepared you will be for our quiz and final exam.
Instructions: Answer all questions to get your test result.
1) What combinations of atoms are involved in this compound? KCl
A
2 potassium atoms and 2 chlorine atoms
B
1 potassium atom and 2 chlorine atoms
C
1 potassium atom and 1 chlorine atom
D
2 potassium atoms and 1 chlorine atom
2) What coefficient values will balance this reaction? H2+O2-->H2O
A
1,2,1
B
2,2,2
C
2,1,2
D
2,2,3
3) What coefficient values will balance the reaction? Al + O2 --> Al2O3
A
1,3,2
B
2,1,1
C
1,3,1
D
4,3,2
4) How does a balanced equation support the Law of Conservation of Matter?
A
A balanced equation shows the same number of atoms on both sides
B
A balanced equation shows the same amount of subatomic particles on both sides
C
A balanced equation show the same amount of energy on both sides
D
A balanced equation shows the same mass on both sides
5) Which part of this equation represents the reactants? 2NH3+4O2 --> 2NO + 3H2O
A
2NH3
B
2NO
C
2NH3+4O2
D
2NO + 3H2O
6) Which part of this equation represents the products? 2NH3+4O2 --> 2NO + 3H2O
A
4O2
B
2NO + 3H2O
C
2NO
D
2NH3+4O2
7) In a chemical equation, what name does the left side have?
A
yield
B
sum
C
products
D
reactants
8) How does the law of conservation of matter apply to chemical equations?
A
The sum of the coefficients on each side of the equation must be the same.
B
The total number of atoms of each element on both sides of the equation must be the same.
C
The sum of the atomic masses on both sides of the equation must be the same.
D
The sum of the atomic numbers on both sides of the equation must be the same.
9) In a chemical equation, what name does the right side have?
A
reactants
B
yield
C
sum
D
products
10) What is a coefficient in a chemical equation?
A
a number following an elemental or molecular symbol
B
a subscript before an atomic symbol
C
a number preceding an elemental or molecular symbol
D
the subscript after an atomic symbol
*select an answer for all questions
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