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Measuring Matter

Measuring Matter. Section 11.1 Chemistry. Objectives. Describe how a mole is used in chemistry. Relate a mole to common counting units. Convert between moles and number of representative particles. Counting Particles. A pair is always 2 objects A dozen is 12 A gross is 144 A ream is 500

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Measuring Matter

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  1. Measuring Matter Section 11.1 Chemistry

  2. Objectives • Describe how a mole is used in chemistry. • Relate a mole to common counting units. • Convert between moles and number of representative particles

  3. Counting Particles • A pair is always 2 objects • A dozen is 12 • A gross is 144 • A ream is 500 If I plant 3 dozen roses, how many roses will I have?

  4. Counting Particles • Chemists use a counting system that uses a very large number. • The mole is the SI base unit used to measure the amount of a substance.

  5. Counting Particles • The mole is used to count particles that are very small. • Molecules, atoms, formula units, electrons, or ions. • The mole is equal to Avogadro’s number: 6.022 x 1023 • This is a HUGE number. • 602,000,000,000,000,000,000,000

  6. Converting Moles to Particles and Particles to Moles • Suppose you buy 3.5 dozen roses. • How many roses do you have? • We must go back to conversion factors. • 3.5 dozen x 12 roses/1dozen = 42 roses.

  7. Conversion Factor! • 6.022 x 1023 representative particles 1 mole

  8. Example Problem • If I have 3.5 mol of sucrose, how many molecules of sugar do I have? • Start with what you are given in the problem. • 3.5 mol of sucrose

  9. Then determine the conversion factor • What do you want to end up with? • Representative particles • Flip the conversion factor so representative particles is on top

  10. Then write your problem out 3.5 mol sucrose x 6.022 x 1023 representativeparticles 1 mol sucrose • 2.11 x 1024 molecules of sucrose.

  11. Practice Problems • Pg. 311

  12. Assignment • Worksheet on Converting Moles to Particles and Particles to Moles

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