Review Questions - Chemical Equations Page 2
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1
2REVIEW QUESTIONS - CHEMICAL EQUATIONS
1. Write down the definition of each of the following key terms.
chemical equation:
reactant:
product:
law of conservation of mass:
open system:
closed system:
2. What does the arrow mean in a chemical equation?
3. For the following chemical reaction, label each formula as a reactant or product.
Fe
+
S
FeS
à
a. Fe ________________
b. FeS _______________
c. S ____________________
4. When is a chemical equation balanced?
5. A number placed in front of a chemical formula in an equation is called a(n) ____________.
6. Circle the letter of each chemical equation that is balanced.
a.
H
+ O
à H
O
c.
Mg + O
à MgO
2
2
2
2
b.
Na + O
à Na
O
d.
2 H
O
à 2 H
O + O
2
2
2
2
2
2
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