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Introduction to Chemical Reactions

Introduction to Chemical Reactions. Chemistry 20 Miss Nicklas. Introduction. All chemical reactions (simple or complex) involved changes in substances One or more starting substances are changed into one or more new substances Reactants Products. Introduction, cont.

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Introduction to Chemical Reactions

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  1. Introduction to Chemical Reactions Chemistry 20 Miss Nicklas

  2. Introduction • All chemical reactions (simple or complex) involved changes in substances • One or more starting substances are changed into one or more new substances • Reactants Products

  3. Introduction, cont. • Remember: in a chemical reaction, atoms are NOT created or destroyed, they are just rearranged • Bonds are broken and new bonds are formed • We are going to study 5 types of chemical reactions • Our knowledge of these will help us to predict what will happen

  4. Writing Chemical Equations • This is a way of describing chemical reactions • Word Equation • magnesium + oxygen magnesium oxide • Skeleton Equation • Mg (s)+ O2 (g)MgO(s) • Balanced Equation • 2 Mg + O2 2 MgO

  5. Examples • 1. Write a skeleton equation for this chemical reaction: • When calcium carbonate is heated, calcium oxide and carbon dioxide are produced • CaCO3(s) heat CaO(s)+ CO2

  6. Examples • 2. Write a sentence that completely describes the chemical reaction shown in the equation: • NaHCO3(s)+ HCl(aq)NaCl(aq) + H2O (l) + CO2(g) • When sodium carbonate is reacted with hydrochloric acid, sodium chloride, water, and carbon dioxide are produced

  7. Diatomic Molecules • Notice: many non-metallic elements exist as covalently bonded molecules • Molecules that share electrons • There are 7 elements that form diatomic molecules (molecules made of 2 atoms) • H2,O2, N2, F2, Cl2, Br2, I2

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