The Good Shepherd School of Imelda, Inc.

RIVERSIDE, IMELDA, ZAMBOANGA SIBUGAYSEC. REG. #G19700393

GOVERNMENT PERMIT No. 37 S. 2015 (PRESCHOOL TO COMPLETE ELEMENTARY)
GOVERNMENT RECOGNITION (R-IX) NO. 002, S. 2008 (COMPLETE SECONDARY COURSE)

LESSON PLAN
Name of Teacher Christy P. Betita Subject SCIENCE
Grade Level 10 Time Allotment 90 minutes
Time Schedule 1:00pm-2:30pm TTH Time Frame Week 4
Quarter 4TH Evaluation Items

TOPIC FACTORS AFFECTING RATES OF CHEMICAL REACTIONS

UNIT STANDARD CONTENT STANDARD
The learners demonstrate understanding of the chemical reactions associated with
biological and industrial processes affecting life and the environment
PERFORMANCE STANDARD
The learners should be able to using any form of media, present chemical
reactions involved in biological and industrial processes affecting life and the
environment.
PRIOR Directions: Directions: Read the following statements about chemical reactions.
KNOWLEDGE Put () if the statement is correct and () if the statement is
A. Reviewing previous wrong. Write your answers on a separate sheet of paper.
lesson or presenting the _____1. When a physical change occurs, there is no new substance formed.
new lesson
_____2. Products are substances that are used up to form new substances in a
chemical reaction.
_____3. The positive sign (+) is the symbol used to show combination of reactants or
products.
_____4. Double Replacement Reaction is when one element replaces another element
from a compound. The more active element takes the place of the less active
element in a compound.
_____5. In a chemical reaction, the total mass of the reactants is equal to the total mass
of the products.
ESSENTIAL What is collison theory?
QUESTIONS What is activation energy?
B. Establishing a purpose What are the factors that speed or rate of chemical reactions is altered or changed?
of the lesson

ESSENTIAL Collision Theory states that atoms or molecules must collide with enough
UNDERSTANDING energy in order to react.

Activation energy is needed to break the bonds of the reactants to form new
products or new substances.

The speed or rate of chemical reactions is altered or changed by the following

factors:1. Particle size or surface area of reactants2. Concentration of the reactants
3. Temperature 4. Presence of catalyst.
OBJECTIVES Within the sixty- minute discussion the Grade 7 students are expected to do the
following at 80% level of accuracy:
a. Explain how the factors affecting rates of chemical reactions are applied in
food preservation and materials production, control of fire, pollution, and
corrosion
VALUES
INTEGRATION
RESOURCES Government of the Philippines, Department of Education. 2015. Grade 10
Learner’s Material. Manila.
 LESSON PROPER
STAGES ACTIVITIES
Exploration Time Allotment: Day: Tuesday
(EXPLORE) Directions: Activity 1. The Rate of Dissolving Detergent Bar and
C. Presenting Powder
examples/instan What you need:
ces of the new detergent bar detergent powder 2
lesson identical containers water
What you have to do:
1. Get two identical containers and fill these with water. Make sure that water levels for both
containers are the same.
2. Put the detergent bar and detergent powder in each container at the same time. Do not
stir.
3. After 2 minutes, stir the container slowly and observe.
Guide Questions:
1. Which dissolves faster, detergent bar or detergent powder? ___________________
2. What could be the possible reason on the difference of the dissolving rate between the
detergent bar and powder? Why is this so? _______________________
Explanation Time Allotment: 1 hour Day: Tuesday
(FIRM UP) Collision Theory states that atoms or molecules must collide with
D. Discussing new enough energy in order to react.
concepts and The reactants in a chemical reaction must also collide to form a new product. The
practicing new reactant molecules must come together in a collision in order to react and produce
skills molecules.

Activation energy is needed to break the bonds of the reactants to form new products or new
substances.
The speed or rate of chemical reactions is altered or changed by the following factors:
1. Particle size or surface area of reactants
2. Concentration of the reactants
3. Temperature
4. Presence of catalyst
Here are the several factors that affect the rate of chemical reactions.

1. Particle Size or Surface Area

Why is there a need to chop a large firewood into
smaller pieces or to its desirable sizes before using it to
build a fire in a wood stove? Smaller pieces of firewood
burn easily compared to large pieces of wood. If we do
not
chop the wood, it will take more time for the wood Figure 4. Large and small firewood
to burn. Illustrator: Medralyn L. Tamayo
In barbequing, large chunks of charcoal is used to slowly cook the meat. The desired
temperature is to produce an ember that will provide sustained heating, not fire. Small chunks of
charcoal produces fire rather than the right amount of heat.

When solid reactants are present in small pieces, reaction rates can
increase. The smaller pieces have a greater surface area, thus, providing much greater
contact among the reactants and effecting more collisions.

2.Concentration
Another important factor influencing the frequency of collision is concentration.
Concentration is the measure of the number of particles of solute contained in each
volume of solution.

Corrosion is another chemical change that happens all around us. Corrosion results
in the deterioration of the metal. One of the most common forms of corrosion is the rusting of
iron metals when it is exposed to air and moisture. It results in the formation of a red or orange
flakes on the surface of iron. These flakes can be removed, exposing another layer of the metal
for rusting.

From the previous activity, when the concentration of acid is increased,

the corrosion rate is likewise increased.
Look at Figure 5. The greater the number of particles, the greater the
collision. When there are a great number of particles, there is a high concentration leading
to greater chances of collision. Thus, a reaction will occur.
Figure 5. (a) Particles in a lower Treating clothes stains with higher
concentration;(b) Particles in a higher amounts of calamansi extract or laundry
concentration bleach removes the stains faster.
Illustrator: Medralyn L. Tamayo, adapted
with modifications from
https://epos.myesr.org/posterimage/esr/e
cr2018/141702/media/734054
3. Temperature
In real life, we cannot see molecules. We can feel
its presence by tasting, feeling (skin and as eye irritation)
and smelling. Way to visualize how particles are affected
by temperature is shown in Figure 6.

On Figure 6, Effect of Temperature on particles,

as the temperature rises, the molecules in hot
water (b), move faster and therefore collide
more and have greater chances a b.
to react with each Figure 6. Effect of Temperature on
other than in the cold water (a). Increasing the particles (a) cold water (b) hot water
temperature increases the rate of reaction. Therefore, heating allows more frequent
Illustrator: Medralyn L. Tamayo, adapted
with modifications from
collisions among particles. Most frequent https://www.visionlearning.com/img/librar collisions
will lead to sufficient energy that will y/large_images/image_11053.png provide necessary
activation energy for the reaction to start.

In food preservation, temperature plays a big role in extending the shelf life of foods.
This is the reason why perishable foods are chilled or frozen. Decreasing the temperature
lowers the rate of spoilage items. Another way to lengthen the shelf life of food is drying.
Drying lowers the moisture or water content in food in order to prevent the growth
microorganism like bacteria, yeast and molds.

4. Catalyst
Suggested ways cited on the previous activity prevents apples and some fruits from
quickly turning brown. The suggested ways slow down the process or even prevented it.
The rate of chemical reactions can be altered. The substance that alters the rate or
speed of chemical reactions is called a catalyst. Generally, a catalyst is used to speed up a
chemical reaction but there are also catalysts that slows down a reaction. These are known as
inhibitors.
 One example of a chemical reaction with a
catalyst is the decomposition of hydrogen peroxide
(Agua Oxinada) to produce oxygen gas and water with
the catalyst manganese (IV) oxide (MnO2). Hydrogen
peroxide (H2O2) (see Figure 7) is decomposed
naturally and will produce oxygen gas when left exposed
but will take a longer time. However, when small
amount of MnO2 is added, bubbles can be seen

Figure 7. Decomposition of
happening. When lighted match is placed near the mouth hydrogen peroxide
of the test tube, it will be reignited. Illustrator: Medralyn L. Tamayo
immediately signifying that there is reaction

Figure 8. Effect of a catalyst (enzyme) on the activation energy of a reaction

Illustrator: Medralyn L. Tamayo, adapted with
modifications from https://en.wikipedia.org/wiki/File:Acti
vation2_updated.svg

A catalyst alters the speed of reaction by changing the activation energy. Figure 8
shows a diagram how the enzyme that acts as the catalyst speeds up a chemical reaction works
by decreasing the activation energy.

Exposition Time Allotment: Day: Thursday

(DEEPEN) Directions: Let’s summarize what you have learned from the lesson and activities.
E. Making Part A. Choose the correct word/s inside the parenthesis. Use a separate sheet of paper for
generalizations your answer.
and 1-2. The reactants in a chemical reaction must 1. (break, collide) to form a new product. 2.
abstractions
(Activation Theory, Collision Theory) states that atoms or molecules must collide with
about the
enough energy in order to react.
lesson
3-4. When molecules collide, a certain minimum energy called 3. (activation energy, collision
energy) is required for a reaction to occur. This was suggested in 1888 by 4. (Antoine
Lavoisier, Svante Arrhenius).
5. Activation energy is needed to 5. (break, make) the bonds of the reactants to form new
products or new substances.
6-7. Reactants required an amount of 6. (energy, particles) in a period to produce products.
The 7. (activated complex, reaction time) is located at the peak of the energy diagram for
a reaction.
8-9. The smaller pieces have a 8. (greater, smaller) surface area, thus, providing much 9.
(greater, smaller) contact among the reactants and effecting more collisions.
10-11. Increasing the temperature 10. (decreases, increases) the rate of reaction. As the
temperature rises, the molecules move 11. (faster, slower) and therefore collide more
and have greater chances to react with each other.
12-13. A 12. (catalyst, reactant) is a substance that alter the rate of a chemical reaction
without being used up in the reaction. The catalyst may be recovered 13. (changed,
 unchanged) at the end of the process.
14-15. 14. (Concentration, Temperature) is the measure of the number of particles of solute
in a given volume of solution. The 15. (greater, smaller) the number of particles, the
greater the collision.
Part B. Create a paragraph indicating the applications of the factors affecting the rates of
chemical reactions in:
a) Food Preservation,
b) Materials Production,
c) Control of Fire,
d) Pollution, and
e) Corrosion

Integration Time Allotment:

(TRANSFER)
F. Creating a Based on what you have learned, suggest ways on how to prolong the shelf life of a milkfish or
Realistic bangus. Write your answer on a separate sheet of paper
Performance
Output

Evaluation Time Allotment: 1 hour Day: Tuesday

(TRANSFER) Directions: Directions: Carefully read each item. Write only the letter of the best answer
for each question. Use a separate sheet of paper for your answers.

1. In 1888, who suggested that particles must possess a certain minimum amount of kinetic
energy in order to react?
a. Amadeo Avogadro
c. John Dalton
b. Antoine Lavoisier
d. Svante Arrhenius
2. Which of the following states that atoms or molecules must collide with enough energy in
order for chemical reaction to occur?
a. Activated Complex
b. Activation Energy
c. Collision Theory
d. Law of Conservation of Mass
3. The rate of chemical reaction is affected by several factors. Which of the following would
not increase the rate of reaction?
a. adding catalyst
b. increasing the concentration of reactants
c. increasing the volume of the container
d. raising the temperature
4. The reacting molecules should possess the minimum energy called activation energy.
How does the activation energy work?
a. It breaks the bonds between the reacting molecules.
b. It converts the reactants into the activated complex.
c. It forms the bonds between the product molecules.
d. It makes the reacting particles collide.
5. How will the crushing of a solid and turning it into a powder increase reaction rate?
a. The activation energy barrier will be lowered.
b. The orientation of colliding particles will be improved.
c. The particles will collide with more energy.
d. The powdered form has more surface area.
6. Which refers to the measure of the number of particles of solute contained in a given
volume of solution?
a. Concentration c. temperature
 b. Catalyst d. particle size
7. Reactants require an amount of energy in a
period of time to produce products. Based on Activated Energy
Diagram

Figure A. Activation Energy Diagram, which of

the following refers to the peak of the energy
diagram for a chemical reaction?
a. Activated Complex
b. Activation Energy
c. Collision Theory
d. Law of Conservation of Mass
8. Perishable goods that are not stored in a Figure A. Activation Energy Diagram
refrigerator show signs of spoilage in less than
a day. Which of the following is not a possible cause of this spoilage?
a. amount of goods c. oxygen in air
b. change in temperature d. presence of microorganisms
9. Why does the rate of reaction increase when the temperature is also increased?
a. Activation energy is lowered.
b. Reactant molecules collide less frequently.
c. Reactant molecules collide less frequently and with greater energy per collision.
d. Reactant molecules collide more frequently and with greater energy per collision.
10. Some reactions take place very slowly even with a high concentration of reactants. These
reactions are hastened using a substance. What do you call the substance that increases
the rate of reaction without being used up during the chemical reaction?
a. catalyst c. product
b. molecule d. reactant
Criteria for Rubrics
Evaluation Your output on this part will be rated by your teacher using the following criteria:
Relevance 10 points
Accuracy 5 points
Mechanics 5 points
20 points
Performance Time Allotment: Day: Monday
Output The students will present their output in front.
(TRANSFER)
Advance Study