Chemistry Study Guide Essay

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Chapter 6 Chemical Reactions Evidence of Chemical Reactions - Some clues: color change, solid forms, bubbles form, heat is produced or absorbed, a flame is produced Reactants – chemicals present before reaction Products – chemicals present after reaction Law of Conservation of Matter – Matter is neither created nor destroyed. For us, it means that atoms present as reactants are present as products Chemical reactions change the way atoms are grouped. We need to “Balance” the chemical equation to show that atoms are not created or destroyed Identities (formulas of compounds) must not change to balance the equation Coefficient - whole number multiples of molecules that is needed so you have an equal number of each element on both sides of the equation Chapter 7 – Precipitation Precipitation Reaction - a reaction in which a solid forms Precipitate – the solid that forms in a precipitation reaction Molecular Equation – shows the complete formulas for each reactant and product Complete Ionic Equation – shows all of the ions for each reactant and product Spectator Ions – Ions that are the same as reactants and products – they don’t react Single Displacement Reaction – an exchange of cations with an anion (A + BC -> AC + B) Double Displacement Reaction - an exchange of cations and anions (AB + CD -> AD + CB) Combustion Reaction – a carbon based compound reacts with oxygen to form carbon dioxide and water Synthesis Reaction – a compound forms from simple substances, like atoms Decomposition Reaction – a compound breaks up into simple substances, like atoms Chapter 9 – Chemical Quantities Coefficients in balanced equations represent ratios of molecules. Since it is a ratio, it can also represent moles. The balanced equation C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(g) means that 1 mole of propane reacts with 5 moles of oxygen to produce 3 moles of carbon

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