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Chapter 8.1: Describing Chemical reactions

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1 Chapter 8.1: Describing Chemical reactions
What I know about chemical reactions and conservation of matter?

2 Water How many different ways can you alter the water “physically” and still end up with water? List the ways you could alter the water “chemically” to create a new substance that is no longer the same as the original substance?

3 Sec 8-1: Chemical reaction
evidence Heat Light Sound Electrical temperature change energy Gas Precipitate Color Odor forms

4 Also there are Physical change
Melting points Density Condensation Evaporation Freezing

5 Example: determine whether each of the following is a chemical or physical change.  bending a toothpick burning a match burning sugar making a cake from scratch smashing a can melting ice to water

6 How to represent Ch. R. Describe Equations  chemical reactions
Word equation hydrogen (a gas) + sulfur yields hydrogen sulfide Formula equation Symbols (C, Na, and Fe)  elements Formulas (NaOH) compounds Equations  chemical reactions

7 Equation Reactants (on the left) Products (on the right)
separated by arrow included physical states Examples: Iron + Oxygen Iron (III) oxide Methane + oxygen  Carbon dioxide + water

8 Practice Problem When solid aluminum oxide and hydrogen gas are heated, molten aluminum and water vapor form. a. Write a word equation for the above reaction. Aluminum oxide + hydrogen  aluminum + water b. Write an unbalanced formula equation using all appropriate symbols.

9 To write an unbalanced equation
You must Write the correct formulas of the reactants and the products. Indicate physical state by putting a symbol after each formula. Indicate catalyst by writing its formula above arrow. Indicate heat and any change above arrow. Practice Problem: Write an unbalanced equation below word equation. Methane + oxygen  Carbon dioxide + water

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