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WorksheetsUnit 7 Formative Review B
Total questions: 15
Worksheet time: 15mins
In a molecular formula, the subscripts indicate…
the smallest whole-number ratio of the atoms
the actual numbers of atoms in a molecule
the atomic masses of each element
the number of moles in 1 gram of the compound
For an ionic compound…
the empirical and molecular formulas are never the same
the empirical and molecular formulas are sometimes the same
the empirical and molecular formulas are always the same
none of the above
For a covalent compound…
the empirical and molecular formulas are never the same
the empirical and molecular formulas are sometimes the same
the empirical and molecular formulas are always the same
none of the above
What is the empirical formula for C8H18?
CH
C4H9
C2H8
CH2
What is the empirical formula for C2H6O2?
CHO
CH2O
CH3O
CHO2
What is the molecular formula for the following organic compound?
C2H6O
CHO
CH6O
C2H6O2
NO2 is the____________________________________for the molecule dinitrogen tetroxide.
Empirical formula only
Molecular formula only
Both empirical and molecular formula
Neither empirical or molecular formula
Mo2O3 is the ________________________________ for the compound Molybdenum (III) oxide.
Empirical formula only
Molecular formula only
Both empirical and molecular formula
Neither the empirical nor molecular formula
What is the molecular formula of a substance that has a molar mass of 88 g/mol and the empirical formula, C2OH4?
C2OH4
C4H2O8
C8O4H16
C6O3H12
How many molecules of butane, C4H10, are in 7.15 liters of butane gas at STP?
2.66x10-22 molecules of butane
5.30x10-25 molecules of butane
1.92x1023 molecules of butane
0.319 molecules of butane
What is the mass, in grams, of 7.9 molecules of propane, C3H8?
348.3426 g propane
5.78x10-22 g propane
5.78 g propane
1.078x1023 g propane
Given the formula representing a hydrocarbon: What is the empirical formula for this hydrocarbon?
C6H10
C3H5
C6H9
C2H3
One of the most commonly used white pigments in paint is a compound of titanium and oxygen that contains 5.99g titanium and 4.01 g of oxygen. Determine the empirical formula.
TiO
TiO2
Ti2O
Ti2O4
The molar mass of a compound with the empirical formula NO2 is 92g/mol. What is the molecular formula of this compound?
NO
N2O4
N3O6
NO2
Which statement best describes these formulas?
Formulas B and D are molecular formulas of the same compound.
Formulas A and C are empirical formulas
Formulas A and C are molecular formulas of the same empirical compound.
Formula B is the molecular formula for Formula A.
