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Science
10th -
11thgrade
Empirical, structural and molecular formulas
20 questions
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- 1. Multiple ChoiceWhich pair has the same empirical formula?NaCrO4 and Na2Cr2O7C2H4O2 and C6H12O6C3H6O3 and C2H6O2CH4 and C2H6
- 2. Multiple ChoiceA formula with the lowest whole # ratio of elements in a compound is calledMolecular FormulaChemical FormulaEmpirical FormulaDistance Formula
- 3. Multiple ChoiceWhat is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?CH2OC2H4O2C4H8O4C6H12O6
- 4. Multiple ChoiceGiven the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.NaPO2Na2PO3Na3PO4NaPO4
- 5. Multiple ChoiceWhat is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.K2SO4K8SO16K8S4O8K8S4O16
- 6. Multiple ChoiceA chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________ionic formulacovalent formulaempirical formulamolecular formula
- 7. Multiple ChoiceAn empirical formula:is a formula that calculates the coefficients of a compound in a balanced equation.is the simplest whole-number ratio of moles of elements in the compound.
- 8. Multiple Choice
C4H6 What is the empirical formula?
CH
CH3
C2H3
C4H6
- 9. Multiple Choice
Br2O6 What is the empirical formula?
BrO3
Br6O2
BrO
Br2O6
- 10. Multiple Choice
C2H4 What is the empirical formula?
CH
CH2
C4H2
C2H4
- 11. Multiple Choice
N2S3 What is the empirical formula?
NS
N3S2
N2S3
- 12. Multiple Choice
S2O8 What is the empirical formula?
S2O8
SO
SO4
S8O2
- 13. Multiple Choice
C2H6O What is the empirical formula?
CHO
C2H6O
- 14. Multiple Choice
P3O4 What is the empirical formula?
PO
P3O4
P4O3
- 15. Multiple Choice
Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.
CrCl
CrCl3
Cr3Cl
Cr2Cl6
- 16. Multiple Choice
A compound containing 92.3 percent carbon and 7.7 percent hydrogen. What is the empirical formula?
CH
CH2
C2H
C2H2
- 17. Multiple ChoiceCalculate the number of atoms in 0.0340 g Zn.5.200 x 10-4 atoms Zn3.130 x 1023 atoms Zn3.130 x 1020 atoms Zn1 atom Zn
- 18. Multiple ChoiceWhat is the percentage of iron in iron(III)oxide?30%70%40%60%
- 19. Multiple Choice
When calculating the empirical formula the mole ratio is given as follows:
H1O3.5
What will the EF be?
H1O3.5
HO3.5
HO4
H2O7
- 20. Multiple Choice
What's the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?
CO2Li3
Li2CO3
Li3CO2
LiCO5
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