Part 4: Balancing Equations

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Presentation transcript:

Part 4: Balancing Equations Science 10 Review Part 4: Balancing Equations

Balancing Chemical Equations Study Guide p. 110 Balancing Chemical Equations

Balancing Chemical Equations Count the number of each atom on reactant and product side of equation (multiply coefficient and subscript). Study Guide p. 110

___Al(s) + ___I2(g)  ___AlI3(s) Study Guide p. 110 Balancing Chemical Equations ___Al(s) + ___I2(g)  ___AlI3(s)

___Al(s) + _3_I2(g)  ___AlI3(s) Study Guide p. 110 Balancing Chemical Equations ___Al(s) + _3_I2(g)  ___AlI3(s)

___Al(s) + _3_I2(g)  _2_AlI3(s) Study Guide p. 110 Balancing Chemical Equations ___Al(s) + _3_I2(g)  _2_AlI3(s)

_2_Al(s) + _3_I2(g)  _2_AlI3(s) Study Guide p. 110 Balancing Chemical Equations _2_Al(s) + _3_I2(g)  _2_AlI3(s)

Always double check your answer. Study Guide p. 110 Step 4 Always double check your answer. e.g. __Al(s) + __ I2(g)  __ AlI3(s) 2 3 2 Products Al = 2 I = 6 Reactants Al = 2 I = 6

Balance elements in elemental form (Fe, O2, S8, P4) last. Study Guide p. 110 Helpful Hints: Balance elements in elemental form (Fe, O2, S8, P4) last.

Balance elements in elemental form (Fe, O2, S8, P4) last. Study Guide p. 110 Helpful Hints: Balance elements in elemental form (Fe, O2, S8, P4) last. Balance polyatomic ions (e.g. SO42-) as a group if they don’t break apart.

Balance elements in elemental form (Fe, O2, S8, P4) last. Study Guide p. 110 Helpful Hints: Balance elements in elemental form (Fe, O2, S8, P4) last. Balance polyatomic ions (e.g. SO42-) as a group if they don’t break apart. Balance oxygen and hydrogen last.

Example: 25 Oxygen __C8H18(s) + __ O2(g)  __ CO2(g) + __ H2O(g) 8 9 12.5 8 9 25 Oxygen 16 Oxygen 9 Oxygen 25 Oxygen +