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WorksheetsUnit 5 Review
Total questions: 20
Worksheet time: 20mins
The law of conservation of mass states
chemical reactions create new atoms
atoms cannot be created or destroyed
reactants vanish once a reaction takes place
products appear when a reaction takes place
Which compounds are the PRODUCTS of this reaction?
CO2 + H2O
C6H12O6 + O2
C6H12O6 + CO2
H2O + O2
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
2MgO
2Mg +O
2Mg + O2
True/False: Reactants are written to the right of the reaction arrow in a chemical equation.
True
False
True/False: Products are written to the right of the reaction arrow in a chemical equation.
True
False
KClO3 → KCl + O2
Fe2(SO4)3 + KOH → K2SO4 + Fe(OH)3
Al + HCl → AlCl3 + H2
Which is the correctly balanced equaition?
Cl2 + 2NaI → 2NaCl + I2
Cl2 + 2NaI → NaCl + 2I2
Cl2 + NaI → NaCl + I2
2Cl2 + NaI → 2NaCl + I2
When balancing an equation...
only the subscripts can be changed
only the arrow can be changed
only the symbols can be changed
only the coefficients can be changed
What type of equation is Si + S8 --> Si2S4?
Synthesis (combination)
Decomposition
Single replacement
Double replacement
One reactant into several products describes what type of reaction?
Decomposition
Synthesis
Combustion
Single Replacement
One element replaces another in a compound describes what type of reaction?
Synthesis
Combustion
Single Replacement
Double Replacement
What type of reaction is C10H8 + 12 O2 → 10 CO2 + 4 H2O ?
Synthesis
Decomposition
Single Replacement
Combustion
Calculate the number of Oxygen atoms in Al(OH)3
1
2
3
4
The ______ are numbers found on the lower right-hand side of an element symbol.
Coefficient
Exponent
Multiplier
Subscript
4CF2Cl2
C = 4, F = 4, Cl = 2
C = 1, F = 8, Cl = 8
C = 4, F = 8, Cl = 8
C = 1, F = 4, Cl = 8
What is the number before a chemical formula called?
Example: 2H2 + O2 ---> 2H2O
Coefficient
Atom
Subscript
Equation
