Reaction Classifications

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Now a few reactions have specific names you'd want to remember. A combination reaction is when you take two compounds and add them to form a new one. Sulfur plus oxygen equalling sulfur dioxide. A decomposition reaction is where one compound breaks down into other ones. We're gonna put as mercury oxide becoming mercury plus oxygen.

Now a single displacement reaction happens when we essentially switch metals and salts. So zinc and copper sulfate would become copper and a zinc sulphate. On this the zinc, switched places with the copper. What is the name of this copper sulphate? We know the charge on sulfate is 2-.

The charge on the copper then would have to be 2+. This is a copper II sulfate. We'll cover these salt names in more detail later. The last one is a double displacement reaction. In this we have, essentially, two salts that just exchange anions and cations. So if we have calcium chloride plus 2 silver nitrate, we get a calcium nitrate, 2 silver chlorides.

Now the reactions need to be balanced, so we have 1 calcium, 1 calcium, 2 chlorines, 2 chlorines, 2 silvers, 2 silvers, 2 nitrate groups, 2 nitrate Groups. Everything is there in the correct proportion. Make sure that equations are balanced before you use the stoichiometric coefficients in any problems.

If the reactions are not balanced, you won't get the correct answers.

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