chemical equations chemistry chapter 8 · 2019. 9. 19. · symbols used in chemical equations (s)...
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Chemistry Chapter 8 Chemical Equations •
Indications of a Chemical Reaction
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2)
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1)2)
3)
C. Johannesson
Law of Conservation of Mass● mass is neither created nor destroyed in a chemical
reaction
4 H2 O
4 H2 O
4 g 32 g
36 g
● total mass stays the same
● atoms can only rearrange
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Symbols Used in Chemical Equations⟶ yields(s) solid(l) liquid(aq) aqueous(g) gasΔ reactants heated
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Significance of a Chemical Equation
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2)
3)
Writing Equations
● Identify the substances involved.● Use symbols to show:
2H2(g) + O2(g) → 2H2O(g)
∙How many? - coefficient∙Of what? - chemical formula∙ In what state? - physical state
● Remember the diatomic elements.
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C. Johannesson
Writing EquationsTwo atoms of aluminum react with three units of
aqueous copper(II) chloride to produce three atoms of copper and two units of aqueous aluminum chloride.
• How many?• Of what?• In what state?
Al 2 (s) + 3CuCl2(aq) → 3Cu(s) + 2AlCl3(aq)
Rules for Balancing Chemical Equations
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Types of Chemical Reactions
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Types of Chemical Reactions
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Types of Chemical Reactions
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Types of Chemical Reactions
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Types of Chemical Reactions
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