Yr 10 Chemistry The Mole

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

 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

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?

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??????

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 atoms  To simplify this really big number we say that 1 mole = 6.02 x atoms

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

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?

Answer AED 6.02 x / AED = 6.02 x payments = 6.02 x seconds 6.02 x seconds / 60 = x minutes x minutes / 60 = x hours x hours / 24 = x 10 9 days x 10 9 days / = x 10 7 years A: It would take 19 million years

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

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

 How many moles are there in  3.01 x particles  x particles  6.02 x particles  x particles