Year 10 Chemistry Advantage – Mole Concept Quiz

The fundamental particles found in the nucleus of an atom are:

• Electrons and neutrons

• Neutrons only

• Protons and electrons

• Protons and neutrons

Which subatomic particle has no charge?

• Proton

• Neutron

• Electron

• Positron

The atomic number of an element represents:

• The number of protons

• The number of neutrons

• The total number of particles in the nucleus

• The sum of protons and neutrons

An isotope of uranium is written as ²³⁵₉₂U. What does 235 represent?

• Atomic number

• Mass number

• Number of neutrons only

• Charge

Avogadro’s number represents:

• the number of particles in one mole of a substance

• the atomic mass of an element

• the volume occupied by one mole of gas at STP

• the number of protons in an atom

Which of the following best defines a mole?

• The number of atoms in 1 gram of hydrogen

• The number of particles in 1 mole of a substance

• The mass of 1 mole of carbon atoms

• The number of molecules in 1 mL of water

What is the value of Avogadro’s number?

• 6.02 × 10²²

• 6.02 × 10²³

• 3.00 × 10⁸

• 1.00 × 10⁶

The molar mass of H₂O is:

• 18.0 g/mol

• 10.0 g/mol

• 8.0 g/mol

• 36.0 g/mol

What is the formula to calculate moles from mass?

• Mass = Moles × Volume

• Moles = Mass ÷ Molar mass

• Moles = Molar mass × Volume

• Moles = Molar mass + Mass

How many moles are in 44 g of CO₂? (Molar mass = 44 g/mol)

• 1.0 mol

• 0.5 mol

• 2.0 mol

• 4.4 mol