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WorksheetsStandard 3 Checkpoint
Total questions: 20
Worksheet time: 1hrs 1mins
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?
4g
5g
9g
14g
Why does this picture demonstrate the Law of Conservation of Mass?
the number of atoms of each element are the same on both sides
they start out separate and end up combined
the same elements are used
it doesn't demonstrate the Law of Conservation of Mass
How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O3
2
3
5
6
What do we call the chemicals that result from a chemical reaction?
reactants
products
subscripts
coefficients
The Law of Conservation of Mass says that matter can neither be __________ or __________.
created; destroyed
recycled; renewed
subtracted; added
joined; separated
The Law of Conservation of Mass states
that matter exists in all states and reacts the same
that matter can only be changed into new substances by introducing a catalyst
that matter exists in the same state throughout any chemical change
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
How many Al atoms are in this compound? 4Al2O3
2
8
6
4
4Fe + _O2 → 2Fe2O3
What type of reaction is illustrated here?
single displacement
double displacement
synthesis
decomposition
What class of reaction best describes the equation below: FeS + HCl --> H2S + FeCl2
synthesis
combustion
single replacement
double replacement
