Unformatted text preview: n a system does
not change. 2HgO(s) → 2 Hg(l) + O2(g) Chemical Equations
• Since matter is
conserved in a chemical
equations must be
balanced for mass!
• In other words, there
must be same number of
atoms of the each kind
on both sides of the
equatoin. Lavoisier, 1788 Balancing Chemical Reactions
Steps in balancing a chemical reaction using coefficients:
1. Write the equation using the formulas of the reactants
and products. Include the physical states (s, l, g, aq
2. Balance the compound with the most elements in the
formula first using integers as coefficients.
3. Balance elements on their own last.
4. Check to see that the sum of each individual elements
are equal on each side of the equation.
5. If the coefficients can be simplified by dividing though
with a whole number, do so. Balancing Chemical Equations:
balance last C2H6 +
2 C’s & 6 H’s O2
2 O’s → CO2 + 1 C & 2 O’s H2O
2 H’s & 1 O Balancing Equations ___ Al(s) + ___ Br2(l) → ___ Al2Br6(s) Balancing Equations: Practice ___C3H8(g) + ___ O2(g) → ___ CO2(g) + _____ H2O(g)
___B4H10(g) + ___ O2(g) →
___ B2O3(g) + ___ H2O(g) Balancing Equations: Practice
• Solid magnesium hydroxide reacts with h...
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