Intro. to CHEMICAL REACTIONS Notes. Binder organization Tab 1: Reference Sheets Tab 2: Chemistry Handouts Tab 3: Math Handouts Tab 4: HW, Tests, quizzes.

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Presentation transcript:

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 – Example: Tearing paper Chemical change: A substance actually changes into something else – Example: Burning paper

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

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

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

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

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

Is it a chemical or physical change? Logs burning

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

Is it a chemical or physical change? Cutting paper

Is it a chemical or physical change? Crushing an aspirin

Is it a chemical or physical change? Metal rusting

Is it a chemical or physical change? An egg rotting

Is it a chemical or physical change? An egg breaking

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

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”

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)

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)