Below is a worksheet all about Chemical Reactions. On the front there are 8 listed statements and for each one I wrote yes if there was evidence of a chemical reaction. When I wrote no that meant there was no evidence of a chemical reaction. On the bottom half of the worksheet I just filled in the blanks of the passage. It related to reactant's and product's. On the back of the page I took the Chemical Reaction given then wrote the balanced chemical equation. So what exactly is a Chemical Reaction? A chemical reaction is the change of a substance into a new one that has a different chemical identity. How can you tell if a reaction is happening? When there is a chemical reaction happening you can physically see changes. Example: The emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. But the only way you will know if a chemical reaction is really happening is validation with a chemical analysis of the products. There are 5 Types of Chemical Reactions. 1. A + B --> AB Synthesis- Two things becoming one
2.AB --> A + B Decomposition - A single compound undergoes a reaction that produces two or more simpler substances.
3. A + BC --> AC + B Single Replacement (Displacement) One element replaces a similar element in the compound.
4. AB + CD --> CB + AD Double Replacement- The ions of two compounds exchange places in an aqueous solution to form two new compounds.
5. Combustion- A substance combines with oxygen, releasing a large amount of energy in the form of light and heat. For organic compounds, such as hydrocarbons, the products of the combustion reaction are carbon dioxide and water.
So there you have it, a brief summary all about Chemical Reaction.