water & solutions
Post on 30-Dec-2015
32 Views
Preview:
DESCRIPTION
TRANSCRIPT
Water & Solutions
Water’s Special Properties!#1- Ice Floats
• When water freezes, its structure locks air pockets in. • This makes water less dense as a
solid than as a liquid.Question: How would our Earth be
different if it didn’t float?
Special Property #2
• Water absorbs and retains heat.
–How does this affect living organisms?–HINT: What is your body temp?
Special Property #3
• Water molecules stick to each other. (Cohesion)
-Water can stay a liquid at room temp. because it sticks together!
Special Property #4
• Water molecules stick to other polar substances. (Adhesion)
• Fig. 5 on p. 55–The water is moving up the stem of
the plant.
Key Terms:• Cohesion- The attraction of particles of the
same substance.• Adhesion- The attraction of particles of
different substances.• Solution- A mixture, in which 2 or more
parts are evenly dissolved. (Has a solute & solvent.)– Solute- This part dissolves.– Solvent- This part does the dissolving.
Key Terms cont.• Acid-Substances that give off H+ ions in
water.• Bases-Substances that give off OH- ions in
water.• pH- The measure of how acidic or basic a
substance is.• Buffer- Prevents pH changes in a
substance. Look at p. 57
top related