STEP ACTIVITY STEP ACTIVITY PRESENTATIONPRESENTATION

ACIDS & BASESACIDS & BASES

TAIK KIMTAIK KIM

OBJECTIVESOBJECTIVES 1. Students will be able to identify the 1. Students will be able to identify the

physical and chemical properties of acids physical and chemical properties of acids and bases.and bases.

2. Students will be able to categorize 2. Students will be able to categorize common house materials as acids or bases.common house materials as acids or bases.

3. Students will be able to relate pH to the 3. Students will be able to relate pH to the strengths of acids and bases.strengths of acids and bases.

4. Students will be able to recognize how 4. Students will be able to recognize how pH levels can affect the life of fish or other pH levels can affect the life of fish or other animals that live in water.animals that live in water.

ACTIVITIESACTIVITIES Lecture: Ohio StandardLecture: Ohio Standard Pre-TestPre-Test Watching Video Tape: “The World of Watching Video Tape: “The World of

Chemistry”Chemistry” Experiment I: Examine pH values for Experiment I: Examine pH values for

various household liquidsvarious household liquids Experiment II: Observe how goldfish Experiment II: Observe how goldfish

react to different pH level in their react to different pH level in their environment environment

Post-TestPost-Test

Warm Up QuestionsWarm Up Questions

Warm Up QuestionsWarm Up Questions

The beautiful statue was spoiled by something. What happened to the statue? And then there is a connection between picture one and picture two. What was it?

Description of ActivitiesDescription of Activities Using the CBL System, the TI Graphing Using the CBL System, the TI Graphing

Calculator, and the pH probe, measure pH Calculator, and the pH probe, measure pH level of household products: lemon juice, level of household products: lemon juice, white vinegar, soap, baking soda, soft white vinegar, soap, baking soda, soft drinks, ammonia, draining cleaner, and drinks, ammonia, draining cleaner, and milk. milk.

Record data on the activity sheet.Record data on the activity sheet. Measuring pH of the fish tank: make Measuring pH of the fish tank: make

observations on fish during 4 days, find any observations on fish during 4 days, find any change of pH level, and record how goldfish change of pH level, and record how goldfish respond to different pH level accordingly.respond to different pH level accordingly.

CBL 2 (Calculator-Based CBL 2 (Calculator-Based Lab)Lab)

AssessmentAssessment Pre-Test: 14 multiple choice problems Pre-Test: 14 multiple choice problems

about acids and bases.about acids and bases. Rubric for Acids and Bases activity.Rubric for Acids and Bases activity. Post-test: Post-test:

1.1. Exactly same test as pre-testExactly same test as pre-test2.2. 12 multiple choice problems 12 multiple choice problems

test for checking validationtest for checking validation(factor analysis)(factor analysis)

Survey for the evaluation of activitySurvey for the evaluation of activity

Results of the Results of the AssessmentAssessment

Survey for the activities of Acids & BasisSurvey for the activities of Acids & BasisA: strongly agree, B: agree, C: disagree, A: strongly agree, B: agree, C: disagree,

D: strongly disagreeD: strongly disagree1. The activities were very helpful to 1. The activities were very helpful to

understand what acids & basis are.understand what acids & basis are.51.3% agree51.3% agree41.6% strongly agree41.6% strongly agree

Q1

4.003.503.002.502.00

Q1

Freq

uenc

y

50

40

30

20

10

0

Std. Dev = .55

Mean = 3.44

N = 78.00

Results of the Results of the Assessment (con’t)Assessment (con’t)

2. The activities 2. The activities increased my increased my interest of interest of science.science.

50% agree50% agree34.6% disagree34.6% disagree10.3 strongly agree10.3 strongly agree

Q2

4.03.02.01.0

Q2

Fre

quen

cy

50

40

30

20

10

0

Std. Dev = .74

Mean = 2.7N = 78.00

Results of the Results of the Assessment (con’t)Assessment (con’t)

3. The activities 3. The activities were well were well organized. organized.

71.8% agree71.8% agree23.1% strongly 23.1% strongly

agreeagree5.1% disagree 5.1% disagree

Q3

4.003.503.002.502.00

Q3

Freq

uenc

y

60

50

40

30

20

10

0

Std. Dev = .50

Mean = 3.18

N = 78.00

Results of the Results of the Assessment (con’t)Assessment (con’t)

4. The activities 4. The activities were important to were important to improve students’ improve students’ understanding in understanding in science classroom. science classroom.

57.1% agree57.1% agree37.7% strongly 37.7% strongly

agreeagree3.9% disagree3.9% disagree

Q4

4.03.02.01.0

Q4

Freq

uenc

y

50

40

30

20

10

0

Std. Dev = .61

Mean = 3.3

N = 77.00

Overall EvaluationOverall Evaluation Most activities went pretty well as planned.Most activities went pretty well as planned. Fish tank activity needed to be modified, Fish tank activity needed to be modified,

from 4 days observation to 3 days different from 4 days observation to 3 days different tank observation.tank observation.

Some students did not pay much attention.Some students did not pay much attention. Exp. 1 took less time than I expected.Exp. 1 took less time than I expected. These activities were all related to real These activities were all related to real

world problems, and increased students’ world problems, and increased students’ skills and motivations.skills and motivations.

Test ScoresTest Scores

4346 4346N =

GENDER

1.00.00

16

14

12

10

8

6

4

2

0

PRETEST

POSTTEST73

8245

GendeGenderr

Pre-Pre-testtest

Post-Post-testtest

FemalFemalee

4.954.95 10.8410.84

MaleMale 4.374.37 9.359.35All All averaaveragege

4.584.58 9.859.85

Authentic Learning Authentic Learning Authentic Learning: a learning activity that Authentic Learning: a learning activity that

requires understanding similar to the requires understanding similar to the understanding required in the real world. understanding required in the real world. (Eggen and Kauchak, 2001, p 234)(Eggen and Kauchak, 2001, p 234)

Lecture: inquiry based lessonLecture: inquiry based lesson Video Tape: related real world problem, like Video Tape: related real world problem, like

acid rain and pollution.acid rain and pollution. Exp 1: hands on activity and using technology Exp 1: hands on activity and using technology

(CBL, pH probe, and TI calculator)(CBL, pH probe, and TI calculator) Exp 2: Hands on, cooperative learning, and Exp 2: Hands on, cooperative learning, and

real world situation.real world situation.