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Chemical Reactions Chapter 10
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10.1 Reactions and Equations
The process by which the atoms of one substance are rearranged to form different substances is called a chemical reaction. Subscript Yield CH4 + 2 O2 CO2 + 2 H2O Reactant Product
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A chemical reaction has taken place when:
-Temperature change -Color change -A gas is produced An odor is produced Precipitation is formed Matter cannot be created nor destroyed. Coefficients are added to have equal amounts of reactants as products.
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Symbols + (a plus sign) separates two or more reactants or products
(an arrow) separates reactants from products. (s) = solid state (l) = liquid state (g) = gaseous state (aq)= aqueous state or ( in water solution)
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Word equations Example: “ Solid iron and chlorine gas react to produce iron(III) chloride solid” Skeleton equations= changing the word equation into symbols Example: Fe(s) + Cl2 FeCl3 (s) Don’t forget about your diatomic molecules= H2 N2 O2 F2 Cl2 Br2 I2
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Common mistakes Don’t forget to swap and drop
Don’t forget roman numerals= the charge Fe (III) = Fe+3 If it ends with an –ide its bonded Ex: Hydrogen Chloride= HCl If it end with an –ine its just the element Ex: Chlorine= Cl2
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Examples Solid carbon and solid sulfur decompose to make carbon disulfide. Skeleton=
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Examples Hydrogen gas and bromine gas combine to produce hydrogen bromide gas. Carbon monoxide gas and oxygen gas combine to produce carbon dioxide gas.
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Example Potassium chlorate(s) potassium chloride(s) + oxygen (g)
On your own do questions on pg 875 section questions 1-8
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