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Basic Concepts of Chemistry Substance Quiz

16 Questions

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Basic Concepts of Chemistry Substance Quiz

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Questions and Answers

What is the definition of a substance?

Anything with mass and volume (correct)

Anything with only volume

Anything with only mass

Anything with color

How is the atomic weight of an element calculated?

By calculating the number of molecules in the element

By calculating the number of atoms in the element

By calculating the mass of one atom of the element (correct)

By calculating the molecular weight

What is the definition of a mole?

The number of atoms in a molecule

A collection of Avogadro’s number of any particle (correct)

The weight of a compound

The mass of one carbon atom

How is the molecular weight of a compound calculated?

By calculating the sum of atomic masses of all atoms in the compound Signup and view all the answers

How are moles of atoms calculated?

By dividing the weight of the elemental sample by Avogadro's number Signup and view all the answers

How are moles of molecules calculated?

By dividing the weight of the sample by Avogadro's number Signup and view all the answers

What is the volume of a gaseous sample directly proportional to, according to Avogadro’s hypothesis?

The number of gaseous moles present Signup and view all the answers

What is the number of molecules in 1 ml of gas at S.T.P. as per Loschmidt number?

$2.687 \times 10^{19}$ Signup and view all the answers

What is equivalent weight equal to?

Molecular weight multiplied by n-factor Signup and view all the answers

What does the n-factor represent for any acid?

Number of H replaced or e-pair gained by its molecule Signup and view all the answers

What does the n-factor represent for any base?

Number of H+ gained by its molecule Signup and view all the answers

What is the concentration unit that represents the amount of solute present in a definite amount of solution?

Molarity Signup and view all the answers

In 100 ml of its aqueous solution, 4g NaOH is present. What is the molarity?

$0.1M$ Signup and view all the answers

What is the number of milliequivalents of H2SO4 present in 50 ml of N/20 H2SO4?

$2.5$ Signup and view all the answers

$10g$ HCl are dissolved in $250ml$ of its aqueous solution. If density of the solution is $1.2g$, what is the molality?

$2m$ Signup and view all the answers

What is the gram equivalent for any salt?

The total cation or anionic charge Signup and view all the answers