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

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

9. 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

11. 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

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

13. Is it a chemical or physical change? Logs burning

14. Is it a chemical or physical change? Breaking water up by separating it into hydrogen and oxygen 2H 2 O  2H 2 + O 2

15. Is it a chemical or physical change? Cutting paper

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

17. Is it a chemical or physical change? Metal rusting

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

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

20. Writing Chemical Equations Reactants = starting materials Products = ending materials Mg  MgO+ O2O2O2O2 (s)(g) (s) ReactantsProduct States of Matter: Solid = (s) Liquid = (l) Gas = (g) Aqueous = (aq) dissolved in water

21. Writing Chemical Equations Example: – Hydrogen gas reacts with oxygen gas to produce liquid water H2H2H2H2 H2OH2OH2OH2O+ O2O2O2O2 (g) (l) “reacts with” “combines with” “is added to” “to produce” “yields” “to make” “synthesizes”

22. Write the Chemical Equation for the following: Solid carbon reacts with oxygen gas to produce gaseous carbon dioxide C (s) + O 2(g)  CO 2(g)

23. 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)  H 2(g) + ZnCl 2(aq)