WorksheetsChemistry Unit 8 WS 5-7 Quiz Practice
Total questions: 20
Worksheet time: 39mins
Which type of formula describes the actual number of each element in a molecule or compound?
Empirical formula
Molecular formula
Structural formula
Simplified formula
Which type of formula describes the lowest whole-number ratio of the elements in a compound?
Empirical formula
Molecular formula
Structural formula
Simplified formula
If methane, CH₄, is 75% carbon, then 100 grams of methane contains how many grams of hydrogen?
25 grams
50 grams
75 grams
100 grams
Ga2(SO3)3
What percent of Zn3(PO4)2 is zinc?
33.15%
16.04%
50.80%
19.68%
Determine the percent composition of each of the elements in Al₂(SO₄)₃.
Al: 18.8%, S: 21.1%, O: 60.1%
Al: 10.5%, S: 32.1%, O: 57.4%
Al: 15.8%, S: 28.1%, O: 56.1%
Al: 20.2%, S: 24.1%, O: 55.7%
What is the empirical formula for a compound that is 54.48% carbon, 13.75% hydrogen, and 31.77% nitrogen?
C4H10N
C2H6N
CH4N
C3H7N
What is the empirical formula of a substance with the molecular formula Se8F12?
Se8F12
Se2F3
Se4F3
SeF
What is the empirical formula of a substance with the molecular formula X20Y15?
X10Y15
X5Y3
X4Y3
X20Y15
What is the molecular formula of this substance?
C2H2
C2H2
C2H6
CH2
What is the molecular formula for a compound that is 39.99% carbon, 6.73% hydrogen, and 53.28% oxygen and has a molar mass of 180.18g?
C6H12O6
C4H8O4
C3H6O3
C5H10O5
What is the empirical formula of K2SO4?
K2SO4
KSO2
K2SO2
KSO8
Empirical and molecular formulas are never the same for any compound.
True
False
The actual chemical formula for 3 compounds is shown below. Select the compound that has an identical empirical and molecular formula.
