2.4 chemical reactions and enzymes
lesson objectives
- explain how chemical reactions affect chemical bonds.
- describe how energy changes affect how easily a chemical reaction will occur.
- explain why enzymes are important to living things.
lesson summary
chemical reactions everything that happens in an organism is based on chemical reactions. a chemical reaction is a process that changes one set of chemicals into another set of chemicals.
- the elements or compounds that enter into the reaction are the reactants.
- the elements or compounds produced by the reaction are the products.
- chemical reactions involve changes in the chemical bonds that join atoms in compounds.
- some chemical reactions release energy; others absorb energy.
energy in reactions
- chemical reactions that release energy often occur on their own.
- chemical reactions that absorb energy require a source of energy. the energy needed to get a reaction started is called the activation energy.
enzymes an enzyme is a protein that acts as biological catalyst. a catalyst is a substance that speeds up the rate of a chemical reaction. catalysts work by lowering a reactions activation energy.
- in an enzyme - catalyzed reaction, the reactants are known as substrates. substrates bind to a part of an enzyme called the active site and remain bound to the enzyme until the reaction is complete, when the products are released.
- temperature, ph, and regulatory molecules can affect the activity of enzymes.
chemical reactions
1. what is a chemical reaction?
2. complete the table about chemicals in a chemical reaction.
chemicals in a chemical reaction
| chemicals | definition |
|--|--|--|--|--|--|--|
| reactants | |
| products | |

Question

2.4 chemical reactions and enzymes
lesson objectives
- explain how chemical reactions affect chemical bonds.
- describe how energy changes affect how easily a chemical reaction will occur.
- explain why enzymes are important to living things.
lesson summary
chemical reactions everything that happens in an organism is based on chemical reactions. a chemical reaction is a process that changes one set of chemicals into another set of chemicals.
- the elements or compounds that enter into the reaction are the reactants.
- the elements or compounds produced by the reaction are the products.
- chemical reactions involve changes in the chemical bonds that join atoms in compounds.
- some chemical reactions release energy; others absorb energy.
energy in reactions
- chemical reactions that release energy often occur on their own.
- chemical reactions that absorb energy require a source of energy. the energy needed to get a reaction started is called the activation energy.
enzymes an enzyme is a protein that acts as biological catalyst. a catalyst is a substance that speeds up the rate of a chemical reaction. catalysts work by lowering a reactions activation energy.
- in an enzyme - catalyzed reaction, the reactants are known as substrates. substrates bind to a part of an enzyme called the active site and remain bound to the enzyme until the reaction is complete, when the products are released.
- temperature, ph, and regulatory molecules can affect the activity of enzymes.
chemical reactions
1. what is a chemical reaction?
2. complete the table about chemicals in a chemical reaction.
chemicals in a chemical reaction
| chemicals | definition |
|--|--|--|--|--|--|--|
| reactants |  |
| products |  |

Accepted Answer

# Brief Explanations:
1. A chemical reaction is a process that changes one set of chemicals into another set of chemicals.
2. Reactants are the elements or compounds that enter into the reaction. Products are the elements or compounds produced by the reaction.
# Answer:
1. A chemical reaction is a process that changes one set of chemicals into another set of chemicals.
2.
| Chemicals | Definition |
|--|--|
| Reactants | The elements or compounds that enter into the reaction |
| Products | The elements or compounds produced by the reaction |

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