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Che 103 chapter3

# 2hgos 2 hgl o2g chemical equations since matter

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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 reaction, 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 etc…) 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: Balancing Example Example 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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