20 Questions
Who proposed the Law of Multiple Proportion?
John Dalton
Define a.m.u (atomic mass unit).
1/12th the mass of a C12 atom
Who proposed the Law of Conservation of Mass?
Antoine Lavoisier
What is the definition of molar mass?
The mass of one mole of a substance in grams
Define 1 mole of a substance.
The amount of substance that contains 6.022 x 10^23 atoms
Define mass percentage and provide the formula to calculate it.
Mass percentage is the percentage of each element present in 100g of a substance. The formula to calculate mass percentage is: Mass percent of an element = (Mass of that element in the compound / Molar mass of the compound) x 100
What are empirical and molecular formulae? Explain the difference between them.
The empirical formula is the simplest formula which gives only the ratio of different elements present in the compound. The molecular formula is the actual formula that gives the exact number of different elements present in the sample.
Find the number of moles and molecules present in 90g of water.
Number of moles (n) = 90g / 18 = 5 moles. Number of molecules = number of moles x 6.022x10^23 = 5 x 6.022x10^23
What is the limiting reagent in a chemical reaction?
The limiting reagent, or limiting reactant, is the reagent which limits a reaction or the reagent which is completely consumed in a chemical reaction.
Differentiate between molarity and molality, and provide their respective formulas.
Molarity is the number of moles of solute dissolved per litre of solution, and its formula is Molarity (M) = Number of moles of solute (n) / Volume of solution in litres (V). Molality is the number of moles of the solute present per kilogram (kg) of the solvent, and its formula is Molality (m) = Number of moles of solute / Mass of solvent in kg
What are aromatic compounds characterized by?
Planar structure
What is the key element present in organic compounds?
Carbon
What role does the classification of organic compounds play?
Helps researchers understand their properties and behavior
Name one industry in which organic compounds have various applications.
Pharmaceuticals
What makes aromatic compounds a subclass of organic compounds?
Unique chemical and physical properties
What is the resistance of aromatic compounds to oxidation?
They are generally resistant to oxidation.
Name a type of aromatic compound with one or more alkyl groups attached to a benzene ring and provide an example.
Alkylbenzenes; Example: Toluene
What are some applications of aromatic compounds?
Perfumes and fragrances, medicines, industrial chemicals, and natural products
Provide an example of a polycyclic aromatic hydrocarbon (PAH) and describe its structure.
Coronene; It has five benzene rings arranged in a pentagonal structure.
What is the significance of the sweet or pungent odor of many aromatic compounds?
It is often used in perfumes and other fragrances.
Test your knowledge of the State Law of Multiple Proportion in chemistry. Learn about the law proposed by John Dalton and its implications for compound formation.
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