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Balancing equations homework
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• Step 1: Write down the word equation.• Step 2: Replace words with the chemical formula
.• Step 3: Check that there are equal numbers of each
type of atom on both sides of the equation. If not, then balance the equation by using more than one.
• Step 4: Write in the state symbols (s), (l), (g), (aq).Reactants Products
sodium + water hydrogen + sodium hydroxide
+ +
+ +
+ +
Na H2O H2 NaOH
2Na 2H2O 2NaOHH2
2Na(s) 2H2O(l) H2(g) 2NaOH(aq)
Hydrogen doesn’t balance. Use 2 H2O, NaOH, 2Na
Chemical Equations
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• Step 1: Write down the word equation.• Step 2: Replace words with the chemical formula
.• Step 3: Check that there are equal numbers of each
type of atom on both sides of the equation. If not, then balance the equation by using more than one.
• Step 4: Write in the state symbols (s), (l), (g), (aq).Reactants Products
magnesium + lead nitrate
magnesium nitrate + lead
+ +
+ +
Mg Mg(NO3)2 Pb
Mg(s) Pb(NO3)2(aq) Mg(NO3)2(aq) Pb(s)
Already balances. Just add state symbols
Pb(NO3)2
Chemical Equations
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