Percent composition and Chemical Formulas

Quiz by Olamide Akinnagbe

Science
Next Generation Science Standards

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### Measures 1 skill fromGrade 9-12ScienceNext Generation Science Standards

HS-PS1-7

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10 questions
• Q1
What is the percent composition of the compound formed when 2.70g of Aluminium combines with oxygen to form 5.10g of Aluminium oxide.
60% Oxygen and 40 % Aluminium
60% Aluminium and 40% oxygen
53% Aluminium and 47% Oxygen
53% Oxygen and 47% Aluminium
30s
HS-PS1-7
• Q2
Calculate the percent composition when 13.3g Fe combines completely with 5.7g Oxygen
70% Fe and 30% Oxygen
57% Oxygen and 43% Fe
43% Oxygen and 57% Fe
30% Fe and 70% Oxygen
30s
HS-PS1-7
• Q3
What is the percentage composition of Fe (Iron) in FeO
68%
52%
22%
78%
30s
HS-PS1-7
• Q4
What is the percentage composition of Mg(OH)₂
40% Oxygen, 40% Magnesium and 20% Hydrogen
50% Magnesium, 40% Oxygen and 10% Hydrogen
3.4% Oxygen, 55.2% Magnesium and 41.4% Hydrogen
41.4% Magnesium, 55.2% Oxygen and 3.4% Hydrogen
30s
HS-PS1-7
• Q5
Which of the following can be classified as an empirical formula
C₆H₁₀O₄
S₂Cl₂
Na₂SO₃
30s
HS-PS1-7
• Q6
What is the empirical formula of C₆H₁₂O₆
CH₂O
C₃H₄O₃
C₂H₃O₂
CHO
30s
HS-PS1-7
• Q7
What is the Empirical formula of compounds with 42.9% C and 57.1% O
C
CO
C₂O
CO₂
30s
HS-PS1-7
• Q8
Determine the empirical formulas of a compound containing 71.72% Chlorine, 16.16 Oxygen and 12.12 Carbon
Cl₂O₂C
ClOC₂
ClOC
ClO₂C
30s
HS-PS1-7
• Q9
Determine the molecular formula of a compound with 94.1%Oxygen and 5.9% Hydrogen and a molar mass of 34g/mol
H₂O₂
HO₂
HO₂
H₂O
30s
HS-PS1-7
• Q10
Determine the molecular formula of a compound containing 50.7% Carbon, 4.2% Hydrogen and 45.1% Oxygen. The molar mass of the compound is 142 g/mol
CHO₂
C₆H₆O₄
C₂H₂O
C₂H₂O₂
30s
HS-PS1-7

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