Download - 5.1 Notes
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5.1 The nature of chemical reactions
Pages 148 - 153
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Goal 1
Understand what occurs during a chemical reaction and
recognize the signs
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• Each compound or element– Has its own physical properties
• Taste• Melting temp• Boiling temp• Color
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• Chemical reactions rearrange atoms– Reactants at start– Compounds are changed– Products at end– New properties shown
2H2 + O2 2 H2O
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• Signs of chemical reaction1. Gas formed
• Bubbles• Odor• Smoke
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• Signs of chemical reaction2. New solid formed
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Sodium sulfide + cadmium nitrate cadmium sulfide
(clear liquid) (clear liquid) (yellow solid)
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• Signs of chemical reaction3. Color change
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• Signs of chemical reaction4. Heat / light energy release
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• Signs of chemical reaction5. Corrosion
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Goal 2
Describe energy movement and the difference between exothermic and
endothermicreactions
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• Break bonds– Reactant break-up– Energy added– Heat, light, electricity, sound
• Form bonds– Product formation – Energy released
2H2 + O2 2 H2O
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• Energy is conserved in chemical reactions
• All accounted for (what goes in…)– Absorbed– Stored– Released
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• Exothermic– Overall reaction releases energy– Reactants had more stored energy than
products
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• Endothermic– Overall reaction absorbs energy– Reactants had less stored energy than
products