1. Warm Up Write the molecular formula for water.
Name the 2 parts of a solution.
How do covalent bonds form?
Define homeostasis.
Warm Up

2. Water and Solutions

4. Water in Living Things

6. What are some of the properties of water?
absorbs heat and retains energy
evaporation carries heat away

8. Cohesion
Cohesion is an attraction between substances of the same kind.
Cohesion causes surface tension which prevents the surface of water from breaking easily.

9. Adhesion Adhesion is an attraction between different substances.
Powers capillary action – movement of water up a narrow tube
Up a stem of a plant

10. Many substances dissolve in water and form solutions.
The polarity of water makes it the universal solvent.

11. Acids, Bases, and pH

12. Acids: compounds that form hydrogen ions (H+) when dissolved in water
taste sour
turn litmus paper red
stomach acid
tomatoes
vinegar
orange juice
coke

13. Bases:
compounds that reduce the concentration of hydrogen ions in solutions
taste bitter
feel slippery
turn litmus paper blue
Ex: soap
bleach
oven cleaner
eggs

14. The relative concentration of H+ is measured as the pH scale.
scale is
strongest acids has pH near 0
strongest bases are near 14
neutral = 7 (ex: water and blood)

15. An important part of homeostasis is the body’s ability to maintain correct pH.
ex: human blood is stomach acid is 2

16. Organic compounds - all contain carbon, are very large molecules, and are made by living things (or in labs)
ex: synthetic vitamins
All other compounds are inorganic. They may also contain C (CO2) and are essential for life.
ex: carbon dioxide, water, and oxygen