Writing Chemical Equations Ch 8. Chemical Equations Give a lot of information about a chemical...
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Transcript of Writing Chemical Equations Ch 8. Chemical Equations Give a lot of information about a chemical...
Writing Chemical Writing Chemical EquationsEquations
Ch 8Ch 8
Chemical EquationsChemical Equations
Give a lot of information about a Give a lot of information about a chemical reaction.chemical reaction.
Writing Chemical Equations: Writing Chemical Equations: Symbols & TermsSymbols & Terms
Reactants: starting substancesReactants: starting substances Products: ending substancesProducts: ending substances +: separates reactants (or products) from each other+: separates reactants (or products) from each other →→: yields, separates reactants from products: yields, separates reactants from products (g): substance is a gas(g): substance is a gas (l): substance is a liquid(l): substance is a liquid (aq): aqueous, substance is dissolved in water(aq): aqueous, substance is dissolved in water (s): substance is a solid(s): substance is a solid
More SymbolsMore Symbols
ΔΔ: when placed over an arrow, : when placed over an arrow, means the reaction has been heated.means the reaction has been heated.
Pt: when a chemical formula is Pt: when a chemical formula is placed over an arrow, it means that placed over an arrow, it means that that substance is a CATALYST that substance is a CATALYST Catalyst: a substance that speeds up a Catalyst: a substance that speeds up a
reaction by its mere presence, is not reaction by its mere presence, is not used up in the reaction.used up in the reaction.
Word EquationsWord Equations
Use names to represent substances used in a Use names to represent substances used in a chemical reactionchemical reaction
Ex.Ex.Hydrogen gas reacts with bromine gas to produce Hydrogen gas reacts with bromine gas to produce
hydrogen bromide gas.hydrogen bromide gas.Hydrogen (g) + bromine (g) Hydrogen (g) + bromine (g) → hydrogen → hydrogen
bromide bromide (g) (g)
Skeleton EquationsSkeleton Equations
Use the formulas for substances Use the formulas for substances instead of their namesinstead of their names
Ex.Ex.Hydrogen (g) + bromine (g) Hydrogen (g) + bromine (g) → hydrogen → hydrogen
bromide bromide (g)(g)
HH22 (g) + Br (g) + Br22 (g) → HBr (g) (g) → HBr (g)