Ms. Goolsarran
Name ______________________________________
Period __________
Questions/Notes for Biology
QUESTIONS
ANSWERS
Water Molecule-40-41
1. Indicate all of the following on the water molecule
a. Oxygen molecule
b. Hydrogen molecules
c. Negative charge
d. Positive charge
2.
a. How many oxygen atoms are in a water molecule
:
Answers
a.
b. How many hydrogen atoms are in a water molecule
b.
c. Which atom is the larger one?
c.
3. A molecule that has unevenly distributed charges is said to
be_____________________
Answer
a.
4. a.Take two water molecules and bring them close together.
The hydrogen of one water molecule is attracted to what part of
the other water molecule?
Answer
a.
Date _______________
b. What type of bonding is this?
b.
4. Indicate on the diagram using dashed lines (----) where
hydrogen bonding would exist
5. What causes water to expand when it is forming into ice?
Answer
a.
6.
Circle the letter of each sentence that is true about water's
cohesion.
Circle
a. It helps some insects can walk across the surface of the water.
b. It refers to the tightness or smoothness across the surface of
the water.
c. It is caused by water molecules not being attracted to each
other.
d. It causes water to form round beads.
7. Use the following words in an accurate sentence about
cohesion
Answer
Attraction, molecules, water, cohesion
8. Choose one part of the water properties lab to explain
how you saw cohesion
a.
Water on the dime
b.
Paper clip floating on the surface of water
c.
Water forming beads on the wax paper
d.
Black pepper floating on water
Explanation
Your answer must include key words about cohesion
9. Circle all the true statements about adhesion
Circle
a. it is an attraction between molecules of different substances
b. it causes water to rise when in a glass cylinder
c. it causes capillary action in plants
10. Choose one part of the water properties lab to explain
how you saw adhesion or not at work
a.
Water and the paper towel
b.
Water in the glass graduated cylinder
c.
Water not forming beads on the wax paper
d.it can happen between water and oil molecules
Explanation
Your answer must include key words about adhesion
11. It is a rainy day, explain how you would see
a.
Cohesion because of the rain
b.
Adhesion because of the rain
Explanations
a.
b.
12. Fill in the blanks with the following words
Heat capacity of water is high because it takes a lot of
Hydrogen bonds, heat, faster, increase, temperature
___________ energy for the molecules to move
____________, this raises the _______________ of the water.
Water’s head capacity, is the amount of heat require to
______________ the temperature.
Solutions and Suspensions p.42
13. a. True or False- a mixture can be chemically combined
a.(Circle). True
b.Give two examples of mixtures you can make in your kitchen
using water
Two examples
b.
c,
False
14.
a. Definition of solvent. Choose an answer by circling the letter
15. Identify the solute and solvent in the following situations
Example: salt (solute, solvent) and water (solute, solvent)
a.
The substance being dissolved
b.
The substance that is doing the dissolving
a.
Dishwashing soap (solute, solvent) + water (solute,
solvent)
Nail polish(solute, solvent) + nail polish remover
(solute, solvent)
Air bubbles (solute, solvent) + soda (solute, solvent)
b.
c.
16.
Why is blood considered a suspension?
ACIDS and BASES pg. 43-44
17.
a.
a.When water splits, what are the two ions that it splits into?
b.Which one is negative? Which one is positive?
b.
18. Which ion does the pH scale indicate? Circle the choice
a.
H+
b. OH-
Acids, Bases, and pH
19. Circle all choices that are true of acids
20. Circle all choices that are true of bases
a.
Circle
Acids have more H+ than OH-
b.
Acids are found above 7 on the pH scale
c.
Acids can be found in some of the foods we eat
d.
a.
Acids tend to taste sour
Circle
Bases have more OH- ions than H+
b.
Bases are above 7 on the pH scale
c.
Soap is an example of base
d. Lemon juice is a base
Answer:
21. During exercise, many chemical changes occur which
causes a drop in pH, which can be very serious. How does the
body deal with changes in pH?
HOMEWORK