Unit 5 INTRODUCTION

Thermodynamics

Look at unit 5 on the standards

1. FALSE- everything has energy (heat, light, sound, electricity, chemical energy. (living things convert energy)2. FALSE- nonmoving objects have potential energy (moving has kinetic)3. FALSE- activity transfers energy, does NOT create.4. FALSE- fuel is a SOURCE of energy… potential energy in their bonds.5. TRUE- converts energy from sunlight to chemical forms6. TRUE- directly convert sunlight using semiconducting materials.

ENERGY:

• The ability to do work or produce heat

Part II: Read/answer questions from the following paragraph.

Quietly read the paragraph to yourself. Then with a partner answer the following question:

What is the major way in which we measure energy?

JOULE

Part III: Read and answer the questions regarding the following scenario

Quietly read the following scenario to yourself and then answer the question with a partner.

d. They are all at room temperature

Temperature:

• A measure of the average kinetic energy of the particles in a sample of matter

Heat flow ppt

Heat was transferred from box #2 to box #1

Heat:

A form of energy that flows from a warmer object to a cooler object.

Part V: Perform the following activityWe are working with sodium acetate trihydrate and water.

While neither is especially toxic, we must always be careful in lab. Put away all food and drink before starting your experiment.

1. Room temperature2. Room temperature3. Dissolves4. Cold = __________0C

Now watch a quick demo… Describe what happened? (use the terms temperature, energy, heat)

HOT HANDS DEMO….

Fe(s) + O2(g) --> FeO

Chemical reaction released energy which could be felt as heat so temperature increased.

Endothermic

• energy is absorbed from surroundings

• Feels COLD

Exothermic

• energy is released

• Feels HOT