1. Yr 10 Chemistry The Mole

2.  Hand back assessment  New Assessment  Read  Create groups  Decide on a topic Starter

3.  TO KNOW the term mole and avogadro’s number.  TO BE ABLE to calculate the number of moles and particles.  TO UNDERSTAND the mole as a unit of amount. Objectives

4. Measuring the amount of substance  Imagine you have some water in a container.  What things could you measure to tell people THE AMOUNT water you have?  Volume  Mass  How about the NUMBER OF PARTICLES?

5. Numbers of Particles (or atoms)  This is an extremely useful number to know…….  Forms the basis of calculations in chemistry.  But there is a problem because it is a REALLY BIG NUMBER.  How big??????

6. How Big a Number???  Say I had 12g of Carbon  How many atoms do you think are in 12g of carbon?  There are 6.02 x 10 23 atoms  To simplify this really big number we say that 1 mole = 6.02 x 10 23 atoms

7. Avogadros Number  We call 6.02 x 10 23 atoms AVOGADROS NUMBER I didn’t discover it. Its just named after me! 6.02 x 10 23 is called “Avogadro’s Number” in honor of the Italian chemist Amadeo Avogadro (1776-1855).

8. How big is 1 mole?  How long would it take to spend a mole of 1 dirham coins if they were being spent at a rate of 1 billion per second?

9. Answer AED 6.02 x 10 23 / AED1 000 000 000 = 6.02 x 10 14 payments = 6.02 x 10 14 seconds 6.02 x 10 14 seconds / 60 = 1.003 x 10 13 minutes 1.003 x 10 13 minutes / 60 = 1.672 x 10 11 hours 1.672 x 10 11 hours / 24 = 6.968 x 10 9 days 6.968 x 10 9 days / 365.25 = 1.908 x 10 7 years A: It would take 19 million years

10.  How many particles in a certain number of moles  How many moles when given a number of particles. Calculations

11.  How many particles are there in  2 moles  0.5 moles  0.2 moles  3.5 moles  A mole of moles.

12.  How many moles are there in  3.01 x 10 23 particles  1.204 x 10 24 particles  6.02 x 10 24 particles  2.408 x 10 20 particles