Balancing…
Equations Formative
1. During a chemical reaction,
25%
A.
25%
B.
25%
C.
25%
D.
new elements are produced
atoms are destroyed
atoms are rearranged
elements are destroyed
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2. An equation is balanced by
changing subscripts
erasing elements as necessary
adding coefficients
adding elements as necessary
A.
B.
C.
D.
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3. What are the reactants in the following
chemical equation:
Zn + CuSO4 -----> ZnSO4 + Cu
25%
A. zinc and copper
25%
B. zinc sulfate (ZnSO4 ) and copper
C. zinc and copper sulfate (CuSO4 )
25%
D. only zinc
25%
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4. What are the products in the following
chemical equation:
Zn + CuSO4 -----> ZnSO4 + Cu
25%
A. zinc and copper
25%
B. zinc sulfate (ZnSO4 ) and copper
C. zinc and copper sulfate (CuSO4 )
25%
D. only zinc
25%
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6. The law of conservation of mass
states that __________ .
in a chemical reaction, efforts should be
made to preserve rare elements without
changing them
matter can be created and destroyed but
does not change forms
in a chemical reaction, the final mass of
the products is always greater than the
starting mass of the reactants
in a chemical reaction, matter is not
created or destroyed, but is conserved
A.
25%
B.
25%
C.
25%
D.
25%
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5. The statement, "Mass can never be
created nor destroyed" is the________.
25%
A.
25%
B.
25%
C.
25%
D.
Law
Law
Law
Law
of
of
of
of
conservation of mass
conservation of matter
conservation of energy
universal gravity
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6. Which of the following can’t be
changed when balancing equations?
33%
A.
33%
B.
Coefficients
Chemical Formula
The number of atoms of each element
initially present
C.
33%
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7. How many total atoms of hydrogen
are shown in the reactants below?
3Fe + 4H2O  Fe3O4 + 4H2
25%
1.
25%
2.
25%
3.
25%
4.
2
4
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Complete the
balancing equation
portion of this
formative now!
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