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Day 5: - PowerPoint PPT Presentation

Day 5:. Check and go over sig fig worksheet Pg 1 in Chapter 2 packet Energy Notes **Element Quiz FRIDAY!!**. Energy Notes:. Energy Heat transfer and Heat Law of Conservation of Energy Heat and Temperature Exothermic/Endothermic. What is Energy?. Energy: the capacity to do work

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• Check and go over sig fig worksheet

• Pg 1 in Chapter 2 packet

• Energy Notes

• **Element Quiz FRIDAY!!**

• Energy

• Heat transfer and Heat

• Law of Conservation of Energy

• Heat and Temperature

• Exothermic/Endothermic

• Energy: the capacity to do work

• Examples:

• Forming a new compound

• Moving something

• Generating light

Energy TRANSFER is always involved when there is a change in matter

• Whether it’s a chemical or physical change

Energy is never created or destroyed in a change of matter – just transferred

• The law that states that energy cannot be created or destroyed, but can be changed from one form to another.

• During any physical or chemical change, the total quantity of energy remains constant.

• Even though it may seem that energy is being destroyed or created, energy is actually being transferred.

• Kinetic Energy

• Energy of motion

• In Chemistry: how fast or slow molecules are moving

• Potential Energy

• Stored energy or energy of position

• In Chemistry: how far apart the molecules are

Surroundings

Surroundings

System

Energy

System

After

reaction

Before

reaction

Notice that the energy of the reactants and products increases, while the energy of the surrounding decreases. However the total energy does not change.

• Light

• Chemicals

• Motion (mechanical)

• Electrical

• Sound

• Heat

• Units to measure Energy:

• Calorie (cal):

• the energy required to raise the temperature of 1 gram of water by 1ºC

• Joules (J):

• The SI Unit for energy

• Heat is energy transferred between two objects with different temperatures

Heat is always transferred in a very specific way:

High Energy to Low Energy.

• The measurement of kinetic energy of a substance

• (How fast or slow the particles that make it up are moving)

• Finish notes/demos 

• Lab!!

• Practice Worksheet

• **Element quiz tomorrow! - Friday!!**

• Demos - demos - DEMOS!!

• Take note of observations.

• Releasing of energy into the surrounding materials is called an exothermic process.

**A chemical reaction that feels warm to the touch

• Evidence:

• Surrounding materials get hotter from the energy released by the reaction

• Examples:

• Freezing Water

• Absorption of energy from the surrounding materials is called an endothermic process.

**A chemical reaction that feels cold to the touch

• Evidence:

• Surrounding materials get colder due to the energy being removed by the reaction.

Examples:

• Ice melting

Lab!

• Exothermic & endothermic processes

• CW/HW: pgs. 1 – 3