Ch 10 Chemical Reactions 10.1

Evidence of Chemical Change Temperature change water-ice-cubes-melting-probe-in-water-white-backdrop-2- AJHD.jpg.html?sessionVar=spider&sessionVarLiteUI=true&sessionVarLocale=en_GB

Evidence of Chemical Change COLOR CHANGE

ml ODOR

Evidence of Chemical Change Gas Bubbles

mmoleprob/GramMoleProb3.htm A solid forms Precipitate

Chemical Equations Word Equation Solid sodium reacts with water to produce sodium hydroxide and hydrogen gas Skeletal Na+H 2 O NaOH + H 2

Balanced Chemical Equations

Balanced Chemical Equations Skeletal Na+H 2 O NaOH + H 2 Balanced 2Na+2H 2 O 2NaOH + H 2

Balancing Chemical Equations 1. Write Skeletal Equation  Be sure to use proper formulas 2. Count atoms of each element in reactants  Remember diatomics H 2, O 2, N 2, F 2, Br 2, Cl 2, I 2 3. Count atoms of each element in products 4. Change coefficients to balance the number of each element in reactants and products 5. Make sure coefficients are in lowest possible ratio Flow chart on pg 283