Unit 3 pp #7 7th grade

442 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
442
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Unit 3 pp #7 7th grade

  1. 1. Section 4Interactions of Matter<br />Chapter 21<br />Energy<br /><ul><li>Energy is the ability to do work.
  2. 2. It is not a form of matter, because it does not have mass or volume. However, energy is involved in every interaction of matter.
  3. 3. The law of conservation of energy states that energy cannot be destroyed nor created.</li></li></ul><li>Section 4Interactions of Matter<br />Chapter 21<br />Role of Energy in Physical Change<br /><ul><li>Potential energy is the energy an object has as a result of its position, shape, or condition.
  4. 4. Kinetic energy is the energy of motion.
  5. 5. Adding the kinetic energy of all atoms or molecules in a substance gives you that substance’s thermal energy.</li></li></ul><li>Section 4Interactions of Matter<br />Chapter 21<br />Role of Energy in Physical Change, continued<br /><ul><li>Phase Change and Energy An object’s thermal energy determines its physical state. When a substance changes from one physical state to another, the amount of thermal energy in that object changes.</li></li></ul><li>Section 4Interactions of Matter<br />Chapter 21<br />Role of Energy in Chemical Change<br /><ul><li>In a chemical change, or reaction, energy is involved in the rearrangement of atoms.
  6. 6. Exothermic Chemical Reaction A chemical reaction that releases energy is an exothermic reaction.
  7. 7. Endothermic Chemical Reaction A chemical reaction that absorbs energy is called an endothermic reaction.</li></li></ul><li>Section 4Interactions of Matter<br />Chapter 21<br />Role of Energy in Chemical Change, continued<br /><ul><li>Change, Energy, and Disorder Even though energy cannot be destroyed, energy can sometimes be transferred into a form that cannot be used to do work.
  8. 8. Most processes result in an increase in randomness or disorder.
  9. 9. Entropy is a measure of disorder or randomness.</li>

×