Signs of a Chemical Change (Chemical Reaction)

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Signs of a Chemical Change (Chemical Reaction)

• Change in temperature
• Change in color
• Odor (scent)
• Gas bubbles
• Appearance of a solid (precipitate)
• Supernate the clear fluid above a precipitate

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Parts of a Chemical Reaction

• Reactants the starting substance(s) in a
  reaction
• Arrow means react to produce or yield
• Products the substance(s) formed in a reaction

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Types of Chemical Reactions
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1. Synthesis reaction 2. Decomposition
reaction 3. Single-replacement reaction 4.
Double-replacement reaction
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Types of Chemical Reactions (continued......)

• Identify each of the following TYPES of
  reactions
• H2(g) Cl2(g) ? 2HCl(aq)
• Cu(s) 2AgNO3(aq) ? 2Ag(s) Cu(NO3)2(aq)
• 2NaN2(s) ? 2Na(s) 3N2(g)
• Ca(OH)2(aq) 2HCl(aq) ? CaCl2(aq) 2H2O(l)