Name:         Jason Kopanke

Subject:    Biology I

Period:    4

Date:        June 12, 2008

OBJECTIVES:

    The students will…

1.    Describe the structure of a water molecule (DOC  2. SC 2C )

2.    Explain how surface tension relates to water’s polarity (DOC 1. SC 2C)

MATERIALS:

-overhead    -overhead markers         -dish of water        -staple     -soap

BELL WORK (5min):

    List the steps of the scientific method.

        -Identify Problem

        -Research Problem

        -Form Hypothesis

        -Design Experiment

        -Test Hypothesis

        -Analyze Data

        -Conclusion

SET (5 min):

    Review scientific method steps from previous day lesson. (Ask students what the scientific steps are.) Ask the students what happens when you toss a rock into a river? What happens when you jump into a pool?

Today we will be doing an in class lab while describing the structure of the water molecule, explain how water’s polarity affects surface tension. Have the students get out two pieces of paper. One will be for class notes the other for the lab.

PROCEDURE:

A.    Following the set, ask the students what they anticipate will happen when you place a staple on water.  For this class we are going to be doing a class lab which TSW will hand in at the end of the class.  

B.    Show the students a staple floating on water. Ask the students to write a large heading on their paper that will be handed in at the end of the class Identify the Problem. Have the students identify the problem in their own words. The problem being the staple floats and should sink. (A & B 5 min)

C.    For their class notes teach the structure of water. (C & D 5 min)

D.    Teach how the water’s polarity results in surface tension.

E.    Have the students write the heading Research the Problem and have them briefly summarize: (5 min)

a.    The structure of water

b.    Explain how water’s polarity .

i.    causes surface tension

F.    Question since the staple floats what happens if you add soap to the water?

G.    Have the students write the heading Hypothesis, and make their own hypothesis. (5 min)

a.    When you add the soap into the water the staple will…

b.    Identify the independent variable (adding the soap to the water)

c.    Identify the dependent variable (the location of the staple  comparison to the water)

H.    Have the students write the word Procedures in their notes.  This section should include the steps in this experiment. (5 min)

a.    Steps

i.    Observe the location of the staple in the water

ii.    Add soap to the water with the staple floating on the surface.

iii.    Observe the location of the staple after the soap is added

I.    Have the students label the next section of their paper with the label Test the Hypothesis. Test the hypothesis by having one of the students add soap to the water. Have the students record under this section what happens when you add soap to the water.

J.    Have the students write the next section heading Analyze the Data.  Under this heading have the students explain what happened. Allow the students time to work independently on this task. Refer to textbook (pg49-50) (5 min)

a.    Water originally had surface tension because of the polarity

b.    This surface tension held the staple above the water

c.    The soap broke the surface tension eliminating the waters ability to hold up the staple.

K.    Have the students write the heading Conclusion.  Under this heading have the students summaries the experiment.  Goal here is to have the students to take this experiment to a further level. Example.

a.    Soap causes water to loose its surface tension. If you wash in a lake it will cause ______________ to happen with the surface tension.  (5 min)

CLOSURE:

    You all should have been able to describe the structure of a water molecule, explain water’s polarity, and identify several biological effects resulting from water’s polarity, properties resulting from water bonding describe the structure. Restate that this lab will be due tomorrow.  Talking about next lecture Monday’s Ecology introduction lecture. (5 min)

Assessment:

Objective: Describe the structure of a water molecule

Formal: The teacher will read the students’ labs (M) to determine whether students could describe the structure of a water molecule (C) and record the grade in the book (D).

Informal: The students will observe the students work during the lecture (M) to determine students’ understanding.

Objective: Explain how surface tension relates to water’s polarity

Formal: The teacher will read the students’ labs (M) to determine whether students understood how surface tension related to water’s polarity (C) and record the grade in the book (D).

Informal: The students will observe the students work during the lecture (M) to determine students’ understanding.