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WorksheetsUnit 5: Reactions - PreTest
Total questions: 10
Worksheet time: 6mins
How many Oxygen atoms are in H2O?
1
2
0
4
How many Hydrogen atoms are in 4H2O?
6
8
2
4
How many atoms are there TOTAL in H2SO4 ?
6
5
7
3
What is a Reactant?
The end result of a chemical reaction.
The arrow that separates the product from the reactant.
The number to the lower right of an element that shows the number of atoms.
The substance changed in a chemical reaction.
The number before a chemical formula that shows the number of molecules present is call a?
Yield
Product
Coefficient
Reactant
Which equation is balanced?
PbO2 + 2H2--> H2SO4
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
2Na + 2H2O --> 2NaOH + H
The reaction AB + XY ⟶ XB + AY is an example of ______.
synthesis
decomposition
single replacement
double replacement
What class of reaction best describes the equation below?
2HI ⟶ H2 + I2
synthesis
decomposition
single replacement
double replacement
What class of reaction best describes the equation below?
Zn + H2S ⟶ ZnS + H2
synthesis
combustion
single replacement
double replacement
Fe + S --> FeS
