Chemical Reactions
- A chemical reaction is the process where one or more substances change to create a different substance or substances.
The new substances have different chemical and physical properties.
- What are the components of a reaction?
reactants = starting materials
products = end materials
- During a chemical reaction, the bonds in the reactants break and new bonds form to make products. Energy is required to break the bonds in the reactants and help fond the bonds in the products.
- Chemical reactions are balanced, which means that they have the same number of atoms for each element in the reactants and products
- Remember, all chemical reactions require energy.
- Many reactions can be grouped into two categories:
- Synthesis - two or more substances combine to form a single compound
Ex. 2Na + Cl2 → 2NaCl
- Decomposition - compound breaks down to form simpler substances
Ex. H2CO3 → H2O + CO2
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