The Mole Flashcards

1️⃣ Familiarise yourself with the flashcards:

  • Look through all the flashcards to see what's on both sides.
  • Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

  • Look at the question or prompt on each card and try to remember the answer before flipping it over.
  • Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
  • Regularly review all the flashcards to help you better understand and retain the information over time.

Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What is meant by one mole of a substance in chemistry?

One mole of a substance is an amount that contains 6.02 × 10^23 particles, such as atoms, molecules or ions.

What is the Avogadro constant and what does it tell you?

The Avogadro constant is about 6.02 × 10^23 particles per mole. It tells you how many particles are in one mole.

Name three types of particles that can be counted in moles.

You can count atoms, molecules and ions in moles.

What unit do we use for amount of substance and what is its symbol?

The unit is the mole and its symbol is mol.

What does the relative atomic mass, Ar, of an element tell you?

Ar tells you how heavy an atom of the element is compared to other atoms, and its value is also the mass in grams of 1 mol of the atoms.

How do you calculate the relative formula mass, Mr, of a compound?

Add up the relative atomic masses, Ar, of all the atoms shown in the formula.

What equation links moles, mass and relative formula mass, Mr?

moles = mass ÷ Mr, or n = m ÷ Mr.

How do you work out the number of moles when you know the mass of a substance?

First find the Mr of the substance, then use moles = mass ÷ Mr.

How do you work out the mass of a substance when you know the number of moles?

Use the equation mass = moles × Mr.

What volume does one mole of any gas occupy at room temperature and pressure (rtp)?

One mole of any gas occupies about 24 dm³ (24 litres) at room temperature and pressure.

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