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

Water and Solutions

Water in Living Things

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

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

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

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

Acids, Bases, and pH

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

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

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

An important part of homeostasis is the body’s ability to maintain correct pH. ex: human blood is 7.4 stomach acid is 2

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