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Chapter 7. Chemical Reactions: An Introduction 7.1 Evidence for a Chemical Reaction Color change PowerPoint Presentation
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Chapter 7. Chemical Reactions: An Introduction 7.1 Evidence for a Chemical Reaction Color change Formation of a solid Formation of a gas Change in temperature. 7.2 Chemical Equations Chemical Reaction - a chemical change occurs Chemical Equation Reactants  Products

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slide1

Chapter 7. Chemical Reactions: An Introduction

7.1 Evidence for a Chemical Reaction

Color change

Formation of a solid

Formation of a gas

Change in temperature

slide3

7.2 Chemical Equations

Chemical Reaction- a chemical change occurs

Chemical Equation

Reactants  Products

Law of Conservation of Matter (therefore, must balance)

Example: hydrogen and oxygen make water

Indicate physical states of reactants & products

Solid (s)

Liquid (l)

Gas (g)

Aqueous (aq) dissolved in water

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7.3 Balancing Chemical Equations

  • Formulas must be written correctly FIRST!
  • (Don’t forget diatomic molecules!)
  • 2. You may not change subscripts on formulas in order to balance equations
  • 3. Use coefficients; it multiplies everything in the formula.
  • 3O2 = 6 O atoms total
  • 4NaOH = 4 Na atoms, 4 O atoms, 4 H atoms
  • ___N2 + ___H2 ___NH3
  • ___C2H6 + ___O2  ___CO2 + ___H2O
  • ___H2 + ___O2  ___H2O
  • ___O2  ___O3
  • ___Cl2 + ___NaBr  ___NaCl + ___Br2