Physical Science 3.2 : Compounds

2,810 views
2,542 views

Published on

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

No Downloads
Views
Total views
2,810
On SlideShare
0
From Embeds
0
Number of Embeds
92
Actions
Shares
0
Downloads
28
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

Physical Science 3.2 : Compounds

  1. 1. C0mpounds<br />Physical Science<br />Chapter 3.2<br />
  2. 2. Objectives:<br />Explainhow elements make up compounds.<br />Describe the properties of compounds.<br />Explain how a compound can be broken down into its elements<br />Giveexamples of common compounds.<br />Bellringer<br />The word compound refers to something that consists of two or more parts. How might you make a compound using elements? What are some compounds that you know?<br />
  3. 3. Compounds: Made of Elements<br />Compound<br />pure substance composed of two or more elements that are chemically combined.<br />Molecule<br />Particle of a compound <br />Formed when atoms of two or more elements join together.<br />The Ratio of Elements in a Compound <br />Elements join in a specific ratio according to their masses to form a compound<br />Example, every sample of water has a 1:8 mass ratio of hydrogen and oxygen.<br />Acetic acid<br />Carbon<br />Hydrogen<br />Oxygen<br />Water<br />Hydrogen<br />Oxygen<br />Baking soda<br />Sodium<br />Hydrogen<br />Oxygen<br />Carbon<br />
  4. 4. Properties of Compounds<br />Each compound can be identified by its physical and chemical properties<br />Compounds Versus Elements<br />A compound has properties that differ from those of the elements that form it.<br />Sodium<br /><ul><li>Soft
  5. 5. Shiny
  6. 6. Very reactive</li></ul>Chlorine<br /><ul><li>Poisonous gas
  7. 7. Yellow gas
  8. 8. Very reactive</li></ul>Sodium Chloride<br /><ul><li>White solid
  9. 9. Dissolves in water
  10. 10. Safe to eat</li></li></ul><li>Breaking Down Compounds<br />Compounds can be broken down into their elements or into simpler compounds by chemical changes<br />Methods of Breaking Down Compounds<br />Energy is needed for a chemical change to occur<br /> Two ways to add energy<br />apply heat <br />apply an electric current<br />
  11. 11. Compounds in Your World<br />Compounds in Nature<br />Proteins<br />Carbon dioxide<br />Carbohydrates<br />Compounds in Industry<br />Some compounds must be broken down for use in industry. <br />Medicines<br />food preservatives<br />synthetic fabrics<br />protein<br />air<br />carbohydrates<br />medicine<br />Food preservative<br />Synthetic fabrics<br />

×