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General Chemistry Zumdahl Chapter 7 Notes Chemical Reactions Week of 1/26/15, Expected test date, Tuesday 2/3/15 Standard: HS-PS1-7 Use mathematical representations.

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Presentation on theme: "General Chemistry Zumdahl Chapter 7 Notes Chemical Reactions Week of 1/26/15, Expected test date, Tuesday 2/3/15 Standard: HS-PS1-7 Use mathematical representations."— Presentation transcript:

1 General Chemistry Zumdahl Chapter 7 Notes Chemical Reactions Week of 1/26/15, Expected test date, Tuesday 2/3/15 Standard: HS-PS1-7 Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.

2 Introduction Where do we see chemical reactions?(1) Everywhere! Cars driving, hair growing, clothes being made, etc…

3 7.1 Evidence for a Chemical Reaction p. 193 of book Most chemical reactions give a visual signal when they occur. What are some examples of these visual changes?(2) ◦ Color change ◦ Precipitate (solid) forms ◦ Gas is formed (bubbles) ◦ A flame forms

4 7.2 Chemical Equations, p. 195 Define ◦ Chemical reaction(3): Atoms of different compounds are rearranged forming new compounds ◦ Chemical equation(4): A visual representation of a chemical reaction ◦ Reactant(5): Chemicals before the reaction ◦ Products(6): Chemicals after the reaction

5 7.2 Chemical Equations What are the abbreviations for ◦ Solid (7): (s) ◦ Liquid (8): (l) ◦ Gas (9): (g) ◦ Dissolved in water or aqueous (10): (aq)

6 7.3 Balancing Chemical Equations, p. 200 It is important to understand that in a chemical reaction atoms are neither created nor destroyed. ◦ There are the same amount of each atom on the reactant side as there are on the product side.

7 7.3 Balancing Chemical Equations The burning of methane gas produces carbon dioxide and water CH 4 (g) + O 2 (g)  CO 2 (g) + H 2 O(l) What is wrong with this?(11) Not balanced! CH 4 (g) + 2O 2 (g)  CO 2 (g) + 2H 2 O(l)

8 7.3 Balancing Chemical Equations The chemical formation of water H 2 (g) + O 2 (g)  H 2 O(l) What is wrong with this?(12) Not balanced 2H 2 (g) + O 2 (g)  2 H 2 O(l) Define coefficient(13): The number of compounds that is needed to make equation balanced.

9 7.3 Balancing Chemical Equations Balance (14) C 2 H 5 OH(l) + O 2 (g)  CO 2 (g) + H 2 O(l) C 2 H 5 OH(l) + 3O 2 (g)  2CO 2 (g) + 3H 2 O(l) N 2 (g)+H 2 (g)  NH 3 (g) N 2 (g)+3H 2 (g)  2 NH 3 (g) O 2 (g)  O 3 (g) 3O 2 (g)  2O 3 (g)


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