Chemistry Quiz

What is the value of 1 mole in terms of the number of particles?

• 6.022 * 10^20

• 6.022 * 10^21

• 6.022 * 10^22

• 6.022 * 10^23

How is molar mass calculated?

• moles/mass

• mass/moles

• moles/volume

• volume/mass

Why is Avogadro's number important in chemistry?

• It provides a connection between the number of moles and particles.

• It measures the mass of an atom.

• It counts the number of atoms directly.

• It measures the volume of a gas.

What is the value of Avogadro's number?

• 6.022 * 10^23 mol^-1

• 3.141 * 10^23 mol^-1

• 2.718 * 10^23 mol^-1

• 1.618 * 10^23 mol^-1

Why is expressing the mass of an individual atom or particle in amu useful?

• Because it will be numerically equal to that substance in grams.

• Because it simplifies the calculation of volume.

• Because it helps in counting particles directly.

• Because it measures the temperature of a substance.

What is a mole?

• A small animal

• A unit of measurement

• A massive heap

• A type of chemical reaction

What is the purpose of dimensional analysis?

• To measure the size of objects

• To convert quantities using conversion factors

• To determine the speed of reactions

• To calculate the density of substances

What is the result of the dimensional analysis calculation 0.85 mol * 12 g/1 mol?

• 10.2 g C

• 1.02 g C

• 102 g C

• 0.102 g C

What do mixtures contain?

• Molecules of one type

• Molecules of two or more types with varying proportions

• Individual atoms

• Fixed proportions of elements

What is the term used to describe the purity of a substance?

• Empirical formula

• Elemental analysis

• Chemical change

• Variable composition