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Unformatted text preview: T. Trimpe 2006 http://sciencespot.net/ &amp; Name __________________________ Atoms are not _______________ or _____________ during a chemical reaction. Scientists know that there must be the ___________ number of atoms on each ___________ of the ____________. To balance the chemical equation, you must add _______________ in front of the chemical formulas in the equation. You cannot _______ or ___________ subscripts! Mg + O 2 &amp; MgO Try these: Ca + O 2 &amp; CaO Ca = Ca = O = O = N 2 + H 2 &amp; NH 3 N = N = H = H = Cu 2 O + C &amp; Cu + CO 2 Cu = Cu = O = O = C = C = H 2 O 2 &amp; H 2 O + O 2 H = H = O = O = 1) Determine number of atoms for each element. 2) Pick an element that is not equal on both sides of the equation. 3) Add a coefficient in front of the formula with that element and adjust your counts. 4) Continue adding coefficients to get the same number of atoms of each element...
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