section 2.4
Post on 30-Dec-2015
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• Chemical reactions are responsible for all the actions of organisms. – Examples
• Photosynthesis• Respiration (breathing)• Digestion
• Oxygen+Sugars CO2 + Water (Reactants) (Products)
• Reactants are changed in a reaction
• EXAMPLE:
• Products are formed in a reaction
Exothermic• Energy EXITS!• The prefix “exo-”
means “out”• Example:
– respiration
• Energy goes IN!• The prefix “Endo”
means “into”• Example:
- photosynthesis
Endothermic
Two Types of Reactions
Vocabulary Check
1. Making and breaking chemical bonds are examples of ____________.
2. Bonds are broken in the ______, which are the chemicals that are changed during the process.
3. Bonds are made in the ________, which are the chemicals that result from the process.
Vocabulary Check cont…
1. The ________ is the amount of energy needed to start a reaction.
2. If a reaction absorbs more energy than it releases, it is called an __________ reaction.
3. If a reaction releases more energy than it absorbs, it is called an __________ reaction.
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