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Intro. to CHEMICAL REACTIONS Notes

Intro. to CHEMICAL REACTIONS Notes. Binder organization. Tab 1: Reference Sheets Tab 2: Chemistry Handouts Tab 3: Math Handouts Tab 4: HW, Tests, quizzes Tab 5: Projects. Physical vs. Chemical Change. Physical change: A substance changes appearance, but it is still that substance

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Intro. to CHEMICAL REACTIONS Notes

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  1. Intro. to CHEMICAL REACTIONS Notes

  2. Binder organization • Tab 1: Reference Sheets • Tab 2: Chemistry Handouts • Tab 3: Math Handouts • Tab 4: HW, Tests, quizzes • Tab 5: Projects

  3. Physical vs. Chemical Change • Physical change:A substance changes appearance, but it is still that substance • Example: Tearing paper • Chemical change:A substance actually changes into something else • Example: Burning paper

  4. Chemical Reactions • Chemical reaction:The process by which one or more substances change to form one or more different substances • Evidence of Chemical Reactions 1. Color change 2. Bubbles (gas formed) 3. Turns cloudy (solid/precipitate formed) 4. Temperature change 5. Change in smell

  5. Chemical Reactions • Chemical reaction:The process by which one or more substances change to form one or more different substances • Evidence of Chemical Reactions 1. Color change 2. Bubbles (gas formed) 3. Turns cloudy (solid/precipitate formed) 4. Temperature change 5. Change in smell

  6. Chemical Reactions • Chemical reaction:The process by which one or more substances change to form one or more different substances • Evidence of Chemical Reactions 1. Color change 2. Bubbles (gas formed) 3. Turns cloudy (solid/precipitate formed) 4. Temperature change 5. Change in smell

  7. Chemical Reactions • Chemical reaction:The process by which one or more substances change to form one or more different substances • Evidence of Chemical Reactions 1. Color change 2. Bubbles (gas formed) 3. Turns cloudy (solid/precipitate formed) 4. Temperature change 5. Change in smell

  8. Is it a chemical or physical change? • Sugar dissolving in tea

  9. Is it a chemical or physical change? • Logs burning

  10. Is it a chemical or physical change? • Breaking water up by separating it into hydrogen and oxygen • 2H2O  2H2 + O2

  11. Is it a chemical or physical change? • Cutting paper

  12. Is it a chemical or physical change? • Crushing an aspirin

  13. Is it a chemical or physical change? • Metal rusting

  14. Is it a chemical or physical change? • An egg rotting

  15. Is it a chemical or physical change? • An egg breaking

  16. + Mg MgO O2  (s) (s) (g) Writing Chemical Equations • Reactants = starting materials • Products = ending materials Reactants Product States of Matter: Solid = (s) Liquid = (l) Gas = (g) Aqueous = (aq) dissolved in water

  17. “reacts with” “combines with” “is added to” “to produce” “yields” “to make” “synthesizes” Writing Chemical Equations • Example: • Hydrogen gas reacts with oxygen gas to produce liquid water + H2O H2 O2  (g) (g) (l)

  18. Write the Chemical Equation for the following: • Solid carbon reacts with oxygen gas to produce gaseous carbon dioxide C(s) + O2(g) CO2(g)

  19. Write the Chemical Equation for the following: • Solid zinc metal is added to an aqueous solution of hydrochloric acid (HCl) to produce hydrogen gas and aqueous zinc (II) chloride. Zn(s) + HCl(aq) H2(g) + ZnCl2(aq)

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