10th grade The mole: counting particles worksheet

The mole: counting particles

Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A sip of water holds 3.011 × 10²³ water molecules. One mole is 6.022 × 10²³ molecules. How many moles is the sip, to 0.01 mol, Ari?
2. 2.

   A party balloon holds 9.033 × 10²³ molecules of carbon dioxide (CO₂). One mole is 6.022 × 10²³ molecules. How many moles is that, to 0.01 mol, Bo?
3. 3.

   A bowl holds 4.5165 × 10²³ sugar molecules. One mole is 6.022 × 10²³ molecules. How many moles of sugar is that, to 0.01 mol, Kira?
4. 4.

   What is one mole, by NIST's definition, Jun?

   • The amount of a substance that fills one liter
   • The mass of one gram of a substance
   • Exactly 6.022 140 76 × 10²³ particles
5. 5.

   A mole is a counting unit, like a dozen. How many particles are in one mole, to four significant figures, Luz?

   • 6.022 × 10²³ particles
   • 6.022 × 10²³ grams
   • 12 particles, like a dozen
6. 6.

   Which of these is a count of particles, Milo?

   • 2 liters of water
   • 2 moles of water molecules
   • 2 grams of water
7. 7.

   On the mole map, which step turns particles into moles, Noah?

   • Divide by 6.022 × 10²³
   • Divide by the mass of one gram
   • Multiply by 6.022 × 10²³
8. 8.

   On the mole map, which step turns moles into particles, Pia?

   • Divide by 6.022 × 10²³
   • Multiply by 6.022 × 10²³
   • Add 6.022 × 10²³ to the moles
9. 9.

   A dozen eggs and a dozen bricks hold the same count. What is true of 1 mol of water and 1 mol of salt, Tala?

   • They take up the same space, since both are one mole
   • They have the same mass, since both are one mole
   • They hold the same number of particles
10. 10.

    One mole of water has a mass of 18.02 g. Does 1 mol of sugar (C₁₂H₂₂O₁₁) also have a mass of 18.02 g, Zee?

    • Yes; a mole is a mass, not a count
    • Yes; one mole of any substance has a mass of 18.02 g
    • No; heavier molecules make a heavier mole