Warm-up (9/15): Is melting an endothermic or exothermic process?

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Presentation transcript:

Warm-up (9/15): Is melting an endothermic or exothermic process? What about sublimation? What does “endothermic” mean?

Day 2: Matter and Thermochemistry II Focus: Heat and Energy Changes

Day 2: Matter and Thermochemistry II Focus: Heat v. Temperature I. Heat travels from a hotter object to a colder object. a. So, in the case of the flames behind these words, describe the direction of heat flow. A: Heat travels from the flames to the surrounding space.

Day 2: Matter and Thermochemistry II Focus: Heat v. Temperature I. Heat travels from a hotter object to a colder object. b. Describe the heat flow during the formation of ice in your freezer. B: Heat travels from the liquid water to the freezer’s air.

Types of Heat Transfer 1. Radiation is when electromagnetic waves directly transport energy through space (ex. sunlight).

Types of Heat Transfer 2. Conduction is the transfer of energy through matter from particle to particle (ex. a beaker absorbs the heat from a hot plate)

Types of Heat Transfer 3. Convection is the transfer of heat by the actual movement of the warmed matter (ex. steam rises from hot soup)

Types of Heat Transfer

Law of Conservation of Energy The Law of Conservation of Energy states that energy cannot be created nor destroyed; but it can be transformed! So when we apply heat to something, the energy must be transformed in one of the following ways…

Thermal energy can be converted into:

Homework: page 8