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Warm Up

Warm Up. What is a chemical reaction? How do you know there has been a chemical reaction?. Notes:. Chemical reactions- are when 2 or more COMPONDS combine chemically or break chemical bonds.

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Warm Up

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  1. Warm Up What is a chemical reaction? How do you know there has been a chemical reaction?

  2. Notes: • Chemical reactions- are when 2 or more COMPONDS combine chemically or break chemical bonds. • Chemical reactions are written using the Element Symbols and any possible subscripts or coefficients.

  3. Reactants → Products • The chemicals go into a reaction are called reactants.  • The chemicals that come out are called products. • The arrow (→) means “yields” or “makes” or “produces”.

  4. Let’s Label: 2Na + Cl2 2NaCl reactants products

  5. Coefficient 2Na + Cl2 2NaCl reactants products

  6. Coefficient 2Na + Cl2 2NaCl Coefficient is the BIG number in front. the number of molecules that are needed to balance it

  7. More details… • Examples of word equations are Hydrogen + Oxygen → Water Sodium + Chlorine → Sodium chloride Zinc + Hydrochloric acid → Zinc chloride + hydrogen gas • In all chemical reactions mass is conserved as reactants are transformed into products by the rearrangement of atoms.

  8. Let’s watch a chemical reaction that is tasty! • http://www.sciencekids.co.nz/videos/chemistry/chocolate.html

  9. What does a chemical reaction look like? Reactants: Carbon- 3 Hydrogen- 8 Oxygen – 10 Is the same # of atoms on the Product side?

  10. How do you say it? • 2 HCl + 2 Na → 2 NaCl + H2 • You would say "two HCl plus two Na yields two NaCl and H two."

  11. Let’s practice: • Work with your partner to complete the worksheet • Keep it! We will check it!

  12. Bill Nye’s chemical reaction video! • http://www.youtube.com/watch?v=PlwuxpMh8nk

  13. Homework: • Do your very best! • Check over your work. • Review power points on my website! • Due next class. Please complete at home!

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