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WorksheetsChem B Unit 6 Test Review
Total questions: 12
Worksheet time: 13mins
When studying Law of Conservation of Mass, what type of system is used?
Open
Closed
Partially Open
Partially Closed
Is this reaction following the Law of Conservation of Mass?
Yes
No
Explain why this question does NOT follow the Law of Conservation of Mass.
A log is weighed before it is burned. After the log is completely burned it is found the mass is much less. This matter was ____ _____. It was converted to a gas. (two words)
(a)
What unit is derived from 1/12th of a carbon atom?
Atomic Number
Isotope ratio
Atomic Mass Unit
The atomic mass of barium is 137.33 amu and the atomic mass of flourine is 18.998 amu. What is the molar mass of BaF2?
(a)
If you know the products of a chemical reaction, what can you deduce about the reactants?
the mass of each reactant
the state of matter each reactant is in
the total number of reactants
the number of atoms in the reactants
Based on the Law of Conservation of Mass, which of the following would be the only possible reactant?
_____ → 2H2 + O2
HO
H2O
2H2O
True or False: If you have 150 grams of reactants, you won't necessarily end up with 150 grams of products.
True
False
Using the following equation:
2Fe2O3 +3C → 4Fe + 3CO2
What is the ratio of carbon to iron, C:Fe?
(a)
A sample contains 5.33 x 1023 molecules of H2. How many grams is this if the molar mass of H2 is 2.02 g/mol?
1.79 grams
1.07 x 1024 grams
2.67 x 1023 grams
10.66 grams
Have you done any extra stoichiometry practice?
Yes
No
