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Double Replacement Reaction:  Two ionic compounds in solution switch partners resulting in two new ionic compounds.

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Double Replacement Reaction:  Two ionic compounds in solution switch partners resulting in two new ionic compounds.

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Potassium iodide and lead nitrate when dissolved in water will react to form potassium nitrate and lead iodide.

2 KI (aq) + Pb(NO3)2 (aq) --> 2 KNO3 + PbI2

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Double replacement reaction of potassium iodide and lead nitrate in a petri dish. Neat demo of double replacement and of diffusion of ions in solution. Notice how the reaction always takes place closer to the origin of lead nitrate. Dispose appropriately - contains lead. Quick intro to balancing equations, too.

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Single Replacement Reaction: A metal will replace the metal cation of an ionic compound forming a new ionic compound and the displaced metal.

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Single Replacement Reaction: A metal will replace the metal cation of an ionic compound forming a new ionic compound and the displaced metal.

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Here hydrochloric acid is reacting with zinc metal to produce zinc chloride. A combustion reaction is then demonstrated as the egg blows up.

2 HCl + Zn(s) --> ZnCl2 + H2(g)

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I decided to try out a demo that I saw Steve Spangler do. I've always wanted to ignite a balloon filled with 2 parts hydrogen gas and 1 part oxygen gas. It just wasn't much of an option in my classroom. The egg is much more practical.

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Combustion Reaction:  A substance is burnt in the presence of oxygen.  Reactions often involve hydrocarbons as a reactant and produce carbon dioxide and water, but this is not always the case:

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Combustion Reaction:  A substance is burnt in the presence of oxygen.  Reactions often involve hydrocarbons as a reactant and produce carbon dioxide and water, but this is not always the case:

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Here sulfur reacts with oxygen to produce sulfur dioxide: S8 + 8 O2 --> 8 SO2

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Decomposition Reaction: One reactant breaks down into multiple products.

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Decomposition Reaction: One reactant breaks down into multiple products.

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Elephant Toothpaste is the breakdown of hydrogen peroxide into liquid water and oxygen gas. Soap is added to make the bubbles.

2H2O2 --> 2H2O(l) + O2(g)

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Potassium iodide is used to catalyze the decomposition of hydrogen peroxide. Dishwashing soap and food colring were added to enhance the effect of the decomposition process.

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Synthesis Reaction: Two simple reactants react to form one product

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Synthesis Reaction: Two simple reactants react to form one product

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Iron + sulfur --> iron sulfide or Fe(s) + S(s) --> FeS