1. Agenda: 1. Notes: Bonds, pH and inorganic compounds 2. Bonds Foldable
Day 14
Agenda:
1. Notes: Bonds, pH and inorganic compounds
2. Bonds Foldable

2. Bell Ringer
Copy and label the diagram

3. Compounds – matter that is made of more than one kind of ATOM
Compounds are made by atoms sharing or taking ELECTRONS from other atom

4. Ionic bond—electrons from one atom are donated to another
Covalent bond—electrons are shared between atoms

6. Chemical reactions occur when bonds are FORMED or BROKEN.
This causes them to recombine into different substances.

7. Metabolism All reactions that occur in an organisms.
Break down and build molecules important to life.

8. Organic: contains carbon (exception: CO2 is not organic)
Compounds
Organic: contains carbon (exception: CO2 is not organic)
Inorganic: does not contain carbon

9. Each molecule is made of two HYDROGEN atoms and one OXYGEN atom
Inorganic Compounds
Water ( H2O )
Each molecule is made of two HYDROGEN atoms and one OXYGEN atom

10. Water –H20

11. Water forms weak Hydrogen bonds between molecules
Water forms weak Hydrogen bonds between molecules. -Positive hydrogen is attracted to negative oxygen.

12. Water: Hydrogen bond

13. Why is water so important to life?
At least 75% of animal body mass is water
Plants contain 70-80% water
Transports nutrients and wastes

14. Why is water so important to life?
Dissolves compounds -- “Universal Solvent”
Regulates body temperature in animals
Provides structure for plants

15. The pH Scale pH scale ranges from 0 -14
pH 7 is neutral; neither acid nor base
Pure water is pH 7
Low pH (0-6.9) = acid
High pH (7.1-14) = base
The closer to the ends of the scale, the stronger the solution is

16. Acids Often taste sour Strong acids can burn skin & eyes
Strong acids can dissolve metals
Examples:
Lemon juice
Vinegar
Car battery acid (dangerous!)

17. Bases Can taste bitter, sweetish, or salty
Strong bases can burn skin & eyes
Bases react more easily with protein than with metal; they are often used for cleaning
Examples:
Milk
Baking soda
Soap
Drain cleaner (dangerous!)

18. 0--------------7---------------14
Acid
Any substance which has a pH of value of less than 7 is considered an acid
Acid Neutral Base

19. 0--------------7---------------14
Base
Any substance which has pH value greater than 7 is a base
Acid Neutral Base

20. pH 7 A pH of 7 is called neutral—neither acid nor base.
Acid Neutral Base