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Chemical Reactions Chemical Rxn- one or more substances is transformed into another substance Evidence of a chemical rxn 1.Change in color 2.Change in.

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Presentation on theme: "Chemical Reactions Chemical Rxn- one or more substances is transformed into another substance Evidence of a chemical rxn 1.Change in color 2.Change in."— Presentation transcript:

1 Chemical Reactions Chemical Rxn- one or more substances is transformed into another substance Evidence of a chemical rxn 1.Change in color 2.Change in temperature (energy) 3.Light given off 4.Precipitate formation-solid forms 5.Bubbles-gas formed **the only way to be sure a chemical reaction takes place, the physical properties of the product must be different from the reactants**

2 Chemical Reactions Reactants must come in contact with each other for a reaction to take place. Reactants LEFT SIDE Products RIGHT SIDE States of matter for both the reactants and products (s)-solid ( l )- liquid (g)-gas (aq)- aqueous- (dissolved in water) (cr)-crystalline yields or produces reaction goes both forward and reverse

3 Classifying types of Chemical Reactions 5 types of chemical reactions: Combustion - oxidation reaction of an organic compound in which heat is released, involves oxygen to form oxides. CH 4(s) + O 2(g) CO 2(g) + H2O (l) + energy Methane combusts Ex. Butane combusts

4 Synthesis- 2 or more reactants joining together to make a larger molecule »Ex. A + B AB »C + O 2 CO 2 »Na + O 2 »6 CO 2 + H 2 O C 6 H 12 O 6 + 6O 2

5 Decomposition A reaction in which a larger molecule breaks down to form simpler compounds »E»Ex: AB A + B »2»2 H 2 O »2»2 NaCHO 3 Na 2 CO 3 + H 2 O + CO 2

6 Single replacement (displacement) reaction -A reaction in which one atom replaces another- Ex. AB + C CB + A Zn + 2 HCl CaCl 2 + K KF + Na NaCl + F Activities Series p. 281 and 832 -order of reactivity- You have to look at this

7 Double replacement (displacement) reaction -a reaction in which two atoms switch places with one another Ex: AB + CD AD + CB Mg(OH) 2(aq) + 2 HCl (aq) NaOH + BaCO 3


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