U3L3 Study Guide: Thermal Energy & Chemical Processes

Exothermic chemical processes _________

Release energy

Endothermic chemical processes _________

Absorb energy

Release energy

Exothermic

Absorb energy

Endothermic

Exothermic chemical processes

• Burning paper, wood, candle

• Iron rusting 

• Fireworks exploding

• Cellular respiration- burning food when you eat it.

Endothermic chemical processes

• Baking/cooking a cake, bread or egg  

• Photosynthesis- plants making the food for us to eat.

• Melting ice cubes

• Dissolving rock salt in water

What can happen when energy is transferred from one system to another?

The energy changes form

Energy is released in this reaction (Exothermic)

Ways to increase the rate of chemical reaction

• Increasing the temperature

• Increasing the surface area of a solid reactant 

• Increasing the concentration of reactants

• Adding a catalyst 

Conduction

energy is transferred as particles bump into each other

Convection

energy is transferred through matter that flows

Radiation

energy can travel through space, where there is NO MATTER