1 / 31

Moles : a counting unit in chemistry What is a mole? Why do we use moles? Mole calculations

Homework: Mole Calculations (see handwritten paper). Moles : a counting unit in chemistry What is a mole? Why do we use moles? Mole calculations Factor Label Method Isotope Review Worksheets. Size of Atoms: Diameter Some estimates. Atoms including the electron cloud

arella
Download Presentation

Moles : a counting unit in chemistry What is a mole? Why do we use moles? Mole calculations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Homework: Mole Calculations (see handwritten paper) • Moles: a counting unit in chemistry • What is a mole? • Why do we use moles? • Mole calculations • Factor Label Method • Isotope Review Worksheets

  2. Size of Atoms: DiameterSome estimates • Atoms including the electron cloud • 1 x 10⁻¹⁰ meters • Nucleus • 1 x 10⁻¹²m • Proton • 1 x 10⁻¹³ m (note: mass: 1.672 x 10⁻²⁴g) • Electron • 1 x 10⁻¹⁶m

  3. Atoms are so small: 1 x 10⁻¹⁰ metersQuarks to Quasars, Powers of Ten

  4. Review: Scientific Notation:aka: exponents, power of ten, etc. • Positive exponents: • 1 x 10⁶ atoms • Negative exponents: • 1 x 10⁻⁶ atoms • Multiplying with exponents: • (1.5 x 10³ atoms) x ( 4.2 x 10⁶ atoms) • (3.4 x 10³ atoms) x (2.0 x 10⁻⁶ atoms) • Dividing with exponents: • (1.5 x 10³ atoms) / ( 4.2 x 10⁶ atoms) • (3.4 x 10³ atoms) / (2.0 x 10⁻⁶ atoms) More information: Appendix near the back of the textbook

  5. Moles Counting Unit in Chemistry

  6. Alternative names for numbers Gross of pencils

  7. The Mole and Avogadro’s Number • What is a mole in chemistry? • How much is a mole? • - • - • - • Why are moles used?

  8. Moles • Why are moles used? • How are they measured? (Standards) • The amount of substance that contains as many particles as there are in exactly 12 grams of C-12. • The amount of substance that contains Avogadro’s number of particles. • Molar mass – using the Periodic Table

  9. Salt particle- NaClModel of NaCl as an ionic compound Each salt particle in this photomicrograph would require the model to be multiplied by 10⁶ or more New Term Formula Unit: NaCl Represents the repeating units that make up an ionic compound Such as NaCl, CaCl, Al₂O₃

  10. Amounts:How can we determine the amount of salt particles in this picture?

  11. Mole Flow Chart Mole

  12. Mole Conversions(Factor Label Method) • Moles ↔ Grams 3.5 moles of He = ? Grams 40 grams of He = ? Moles Molar mass: 1 mole of He = ? Grams

  13. Review scientific notation Mole Conversions • Moles ↔ Particles (atoms, molecules, compounds, etc.) 3.5 moles of He = ? Atoms 12.04 x 10²³ atoms of He = ? Moles 1 mole = atoms

  14. Mole Conversions • Moles ↔ Volume of Gas (at STP) 3.5 moles of He = ? Liters 100 Liters of He = ? Moles 1 mole of a gas = Liters

  15. Practice problems: Moles and Mass • What is the mass of 0.5 moles of S? • How many grams is equivalent to 0.137 moles of Fe? • 4.63 mol P = ? grams P

  16. Practice problems • How many moles are in 84.3 grams of Si? • 50 grams of Ne = ? moles of Ne

  17. Mole and Atom Conversions • How many atoms of Al are in 2.5 moles? • How many atoms of Ag are in 0.26 moles? • How many atoms of He are in 0.0023 moles?

  18. Mole and Atom Conversion • How many moles of P contains 1.0 x 10²³ atoms? • How many moles of Au are in 2.8 x 10²º atoms?

  19. Moles, Moles, Moles Lab Sample in a jar Mass Moles Atoms 1 mole = ? grams 1 mole = ? atoms

  20. A Mole is a Number

  21. Review

  22. Carbon has 6 protons

More Related