intro. to chemical reactions notes. binder organization tab 1: reference sheets tab 2: chemistry...
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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 Reactions1. Color change2. Bubbles (gas formed)3. Turns cloudy (solid/precipitate formed)4. Temperature change5. 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 Reactions1. Color change2. Bubbles (gas formed)3. Turns cloudy (solid/precipitate formed)4. Temperature change5. 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 Reactions1. Color change2. Bubbles (gas formed)3. Turns cloudy (solid/precipitate formed)4. Temperature change5. 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 Reactions1. Color change2. Bubbles (gas formed)3. Turns cloudy (solid/precipitate formed)4. Temperature change5. 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
• 2H2O 2H2 + O2
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
MgMg MgOMgO++ OO22(s) (g) (s)ReactantsReactants ProductProduct
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
HH22 HH22OO++ OO22(g) (g) (l)
““reacts with”reacts with”““combines with”combines with”““is added to”is added to”
““to produce”to produce”““yields”yields”““to make”to make”““synthesizes”synthesizes”
Write the Chemical Equation for the following:• Solid carbon reacts with oxygen gas to
produce gaseous carbon dioxideC(s) + O2(g) CO2(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) H2(g) + ZnCl2(aq)
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