Chapter 11.1 Pages 321-324. Chemical Reactions Occur everywhere and all the time Rusting iron, Break...
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Transcript of Chapter 11.1 Pages 321-324. Chemical Reactions Occur everywhere and all the time Rusting iron, Break...
Chapter 11.1Pages 321-324
Chemical ReactionsOccur everywhere and all the time
Rusting iron, Break down of glucose, Exploding hydrogen
Evidence of chemical reactionsColor change pH changeEnergy change (gets hotter or colder)
Precipitate formationGas formation
Chemical EquationsA representation of a chemical
reactionExample:
H2 + O2 2H2OReactants = H2 + O2 Products = 2H2O = Yields or Produces
Chemical Sentences and Word EquationsNames of elements or compounds are
used to indicate substances and the amounts used in a reaction
Example:H2 + O2 2H2O
Chemical SentenceOne molecule of hydrogen gas reacts
with one molecule of oxygen gas to produce (yield) two molecules of water.
Chemical Sentences and Word EquationsNames of elements or compounds are
used to indicate substances and the amounts used in a reaction
Example:H2 + O2 2H2O
Word EquationHydrogen gas + Oxygen gas Water
PracticeFe(s) + O2(g) Fe2O3(s)
What are the products?What are the reactants?What is the chemical sentence?What is the word equation?
H2O
Other Symbols to know…(s) = substance is in a solid state(l) = substance is in a liquid state
(aq) = aqueous solution - substance is dissolved in water
(g) = substance is in a gaseous state
Other Symbols to know…+ = used to separate two reactants or two products
= separates reactants from products
= for reversible reactions or = indicate that heat is used in the reaction
= A formula (could be any – in this case platinum) indicates it is used as a catalyst
Pt
Heat
CatalystA substance that speeds up a chemical reaction but is not used in the reaction
Example:Fe(s) + O2(g) Fe2O3(s)
What are the catalysts in this reaction?
What phase state is each substance in for this reaction?
H2O