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WorksheetsQuiz #5 Balancing Reactions
Total questions: 15
Worksheet time: 23mins
What does the Law of Conservation of Mass state?
Matter cannot be gained or lost in a chemical reaction.
Matter can only be lost in a chemical reaction.
Matter can only be gained in a chemical reaction.
Matter can be gained and lost in a chemical reaction.
Example: H2
When balancing equations a ____ can be placed in front of a formula of a substance to make the equations balanced
charge
subscript
random number
coefficient
The two sides of a chemical equation are called?
Reactants (left) and Products (right)
Ingredients (left) and Product (right)
Cations and Anions
Reactants (left) and Results (right)
Ex: 2H2 + O2 --> 2H2O
Balance this reaction: ____ NaF + ____ Br2 ---> ____ NaBr + ____ F2
3,1,2,1
4,2,4,2
2,1,2,1
1,2,1,2
Which problem is balanced?
PbO2 + 2H2 --> 2PbH4 + O2
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
PCl5 + ___ H2O → ___ HCl + H3PO4
4, 5
1, 6
3, 8
2,2
How many atoms TOTAL of nitrogen, N, are in 4 molecules of calcium nitrate: 4Ca(NO3)2
4
1
8
2
Is the following equation balanced?
2Fe + 3O2 --> 2Fe2O3
yes
no
2CH3OH + 3O2 --> 2CO2 + 4H2O
_Al +_HCl --> _H2 +_AlCl3
