Learner's Materials Pages 45-48 - Content Standards The learner demonstrates understanding of

Station 2: Refraction of Sound Waves Questions:

A. Content Standards The learner demonstrates understanding of heat and temperature and the effects of heat on the body

2. Learner's Materials Pages 45-48

Teaching Date and

Time Quarter First (Physics)

DAY:

I. OBJECTIVES

A. Content Standards The learner demonstrates understanding of heat and temperature and the effects of heat on the body.

B. Performance Standards C.

Learning Competencies / Objectives Write the LC code for each

(S8FE-Ig-29)

 Differentiate between heat and temperature at the molecular level

Objective:

Explain the effect of temperature change on phase changes.

II. CONTENT

Module V: HEAT

Lesson 27: PHASE CHANGE

III. LEARNING RESOURCES

A. References

1. Teacher's Guide Pages 31-33

2. Learner's Materials Pages 45-48

3. Textbook Pages

4. Additional Materials from Learning

Resource (LR) portal

B. Other Learning Resource

IV. PROCEDURES

A. Reviewing previous lesson or presenting the

new lesson What is thermal expansion? How does it work?

B. Establishing a purpose for the Lesson

The students need to understand the difference between particles in a gas, liquid, and a solid. Have students look at the Gases, Liquids, and Solids page on the Purdue University Chemistry Department website

(https://www.chem.purdue.edu/gchelp/liquids/character.html) Here they will see how the characteristics of solids, liquids, and gases can be explained by particle motion.

C. Presenting examples / instances of the new lesson

Discuss what happens at both the observable and molecular level in these scenarios:

1. Water is placed in the freezer.

2 .Ice melts.

3. A puddle evaporates.

D. Discussing new concepts and practicing

new skills #1 Activity-see Lesson Guide pp. 109

Discussing new concepts and practicing new skills #2

Station 1 :

1. Why does the ice inside the container melt after sometime?

2. Describe the temperature of the water while the ice melting.

3 .Describe the temperature of the water after the ice has melted.

4 .Which is your dependent variable? Which is your independent variable? (Note that the independent quantity is plotted along the X axis while the dependent quantity is plotted along the Y-axis.

5. Describe your graph

6 .What can you say about the one variable as the other variable changes? What relationship can be infer from the graph?

Station 2:

1. Describe and interpret your graph.

2. What similarities and differences have you noticed between your graphs obtained from Station 1 and Station 2?

F. Developing mastery

(Leads to Formative Assessment 3) Discuss the answer in the activity given

G. Finding practical applications of concepts and skills in daily living

What is the importance of phase change in the preparation of home-made ice cream?

Ice is in solid form. Therefore, its particles are actually moving more slowly (still locked in lattice position) than those in the liquid brine (sliding past). Any thermal energy absorbed from the cream will first be used to raise the temperature of the brine (which requires more energy to accomplish because of the solute). Once the average kinetic energy of the molecules (aka:

temperature) in the brine has increased enough, then they will begin to transfer energy to the ice, and it will again begin to melt.

The temperature of the brine will not increase above the melting point until all of the ice has melted (all energy is used to

accomplish phase change before increasing temperature.

H. Making generalizations and abstractions about the lesson

Changing the amount of heat energy usually causes a temperature change. However, DURING the phase change, the temperature stays the same even though the heat energy changes. This energy is going into changing the phase and not into raising the temperature. That's why water doesn't get hotter while it boils. The temperature remains constant until the phase change is complete.

When a substance changes from one state, or phase, of matter to another we say that it has undergone a change of state, or we say that it has undergone a change of phase. For example, ice melts and water; water evaporates and becomes water vapor.

These changes of phase always occur with a change of heat. Heat, which is energy, either comes into the material during a change of phase or heat comes out of the material during this change. However, although the heat content of the material changes, the temperature does not.

I. Evaluating Learning

Assessment:

Direction: Read each statement carefully and write the letter of the best answer.

1.When a solid, liquid or a gas changes from one physical state to another, the change is called

A. Melting B. Phase change C. Solidification D. Freezing

2.A solid undergoes a phase change to liquid state it A. releases heat while remaining at constant temperature B. absorbs heat while remaining at a constant temperature C. releases heat as the temperature decreases

D. absorbs heat as the temperature increases 3.The condensation of water vapor actually A. Warms the surroundings

B. Cools the surroundings

C. Sometimes warm sometimes cools D. Neither warms nor cools the surroundings

4.The phase change occurs when a solid changes to a liquid.

A. Freezing B. Sublimation C. Melting D .Evaporation

5.The phase change occurs when a liquid becomes a solid.

A .Freezing B. Sublimation C. Melting D. Evaporation

J. Additional activities for application or

Remediation What is heat capacity?

V. REMARKS

VI. REFLECTION

A. No. of learners who earned 80% in the evaluation

B. No. of learners who require additional activities

for remediation who scored below 80%

C. Did the remedial lessons work? No. of learners who have caught up with the lesson

D. No. of learners who continue to require

remediation

E. Which of my teaching strategies worked well?

Why did these worked?

F. What difficulties did I encounter which my

principal or supervisor can help me solve?

G. What innovation or localized materials did I Use or discover which I wish to share with other teachers?

GRADES 1 to 12 School Grade Level Grade 8

Daily Lesson Log Teacher Learning Area SCIENCE