Science Starter (Week 9, Tuesday, 4/5/16)

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Presentation transcript:

Science Starter (Week 9, Tuesday, 4/5/16) Using dimensional analysis, calculate the following quantities. How many dozen in 288 eggs? How many kilometers in 3.3 x 1045 centimeters? How many milligrams in 1.24 x 10-4 kilograms? How many seconds in 4.90 years? Grab a calculator

SWBAT describe what a mole is. SWBAT calculate and describe molar mass Objective SWBAT describe what a mole is. SWBAT calculate and describe molar mass

Agenda Science Starter Intro to the Mole What is the mole? Conversion factors Particles  Moles and Moles  Particles Molar Mass/Mass  Moles and Moles  Mass Exit Ticket/Homework

Let’s say that 100 peanuts have a mass of 55 grams Let’s say that 100 peanuts have a mass of 55 grams. The peanuts inside the container weigh 110 grams. How can we determine how many peanuts we have without counting them one by one?

What do peanuts have to do with chemistry? How many hydrogen atoms are in a container of water? Can you count them? …In this unit we will use mass to determine how many atoms are in substances.

Scientists came up with THE MOLE to count atoms, molecules, etc. Because atoms, electrons, molecules, etc are so tiny this number needed to be REALLY BIG to make counting easy!

In chemistry we use a unit called the THE MOLE to measure the number of particles in a sample. 1 MOLE of water = 18 grams 1 MOLE of salt = 58 grams 1 MOLE of sugar = 180 grams How many particles do you think are in a mole?????? (remember, it is the same number of particles for all of them)

Unit 5: The Mole Intro to the Mole

Just like 1 dozen = 12 1 mole = 6.022 x 1023 …. Or 602,200,000,000,000,000,000,000.0 This number is named Avogadro’s number for Italian scientist Amedeo Avogadro.

Why do we use this quantity called “The MOLE” in chemistry? Conclusion Why do we use this quantity called “The MOLE” in chemistry?

60200000000000000000000 particles THE MOLE = 6.02 x 1023 particles One mole of ANYTHING = 6.02 x 1023 particles

HOW LARGE IS THE MOLE?!?! Think about this… 1 mole of pennies could be distributed to all the currently-living people of the world so that they could spend a million dollars per hour every hour (day and night) for the rest of their lives.

HOW LARGE IS THE MOLE?!?! 1 mole of donut holes would cover the entire planet in 5 miles of donuts. 1 mole of sheets of paper would be so high, it would go right past the sun. 1 mole of atoms stacked on top of each other would go to the moon and back. It would take 134,000 years for a mole of water droplets to flow over Niagara Falls.

The Mole Notes & Practice Sheet Read the front of the sheet silently for the first 10 minutes, if you finish flip to the back Highlight important numbers, terms, and examples After 10 minutes you can work with the people around you to answer the questions on the back Still confused? Check out my website for some help! Mrhoutzscience.weebly.com

Write on Unit 5 Packet Part 1 1 mole = 6.02 x1023 atoms/molecules/particles 1 mole = 22.4 L of gas @ standard temperature and pressure (STP) 1 mole = molar mass of a compound (measured in grams)

Write on Unit 5 Packet Part 1 Converting… Conversion Factor Moles atoms or molecules or particles 1 mole of anything = 6.02 x 1023 atoms/molecules/particles Moles  volume 1 mole of gas = 22.4 liters @ standard temperature and pressure (STP) Moles atoms or molecules 1 mole of anything = molar mass (g) 1 dozen egg = 12 eggs. How many eggs are in 3 dozen eggs? 1 mole of anything = 6.02 x 1023 particles/atoms/molecules. How many particles are in 2 moles of oxygen?