GENERAL CHEMISTRY - Q1 - Mod5 - Isotopes and Their Uses
GENERAL CHEMISTRY - Q1 - Mod5 - Isotopes and Their Uses
GENERAL CHEMISTRY - Q1 - Mod5 - Isotopes and Their Uses
General
Chemistry 1
Quarter 1 - Module 5:
Common Isotopes and
Their Uses
What I Need to Know?
This module was made to educate you on the nature of isotopes and how
those isotopes contributed in many aspects of human life. Despite of their known
uses in various fields, these may still pose danger to anyone if safety precautionary
measures were not observed. In addition, understanding how the number of
nucleons (protons and neutrons) dictates the existence of isotope of a particular
element. Thus, knowing the process of determining the mass number and neutron
number of an isotope through mathematical operations is important skill to
acquire. The scope of this module covers many different learning situations where
students could relate their personal experiences on isotopes. The language used
recognizes the diverse vocabulary level of students. The lessons are arranged to
follow the standard sequence of the course. But the order in which you read them
can be changed to correspond with the textbook you are now using.
What I Know?
(Critical Thinking)
To check your prior knowledge about the topic, and to solicit the questions
that you want to know about it, fill in the Know and Want to know components of
the Know-Want to know- Learned (KWL) chart properly and correctly. For the Know
component, you may write word/s or sentence. For the want to know component,
state your responses in interrogative or question form. You may list as many
responses as you want for each component. Write your responses on a separate
sheet of paper.
KWL Chart
Topic Know Want to know Learned
Isotopes
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Guide Questions
1. Based from what you have written on the Know component of the chart, what do
you know about isotopes?
2. If you were to think of a question that you want to ask about isotopes, what
question would that be?
HOLD ON AMIGO!!!
DIRECTION: After you have filled-in the K and W components of the
chart and answered the guide questions, answer now the diagnostic
assessment below within 10 minutes.
PRE-TEST
Multiple Choice. Read and answer each statement carefully then write the letter of
the best answer on a separate sheet of paper.
HOLD ON AMIGO!!!
DIRECTION: Rest for 1 minute then you may start reading the lesson
1 below about the nature and uses of isotopes.
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Lesson
Isotopes and Their Uses
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Isotopes are often related to nuclear energy which is being used in many
industries. This is because the nuclear energy usually comes from radioisotopes- a
kind of isotopes that is radioactive. Many of the food products in the market were
subjected to radiation that comes from radioisotopes. Only few people knew this
because the industries are aware that people are sensitive to the use of nuclear
energy. This module will discuss the nature of isotopes as well as their kinds,
examples and uses.
What’s In?
Picture Analysis. Analyze the picture below then answer the corresponding
guide questions.
Guide Questions
1. What is the picture showing to us? Why did you say so?
2. Which instrument or device was used to capture the image? Why?
3. How is isotope related to the image?
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HOLD ON AMIGO!!!
DIRECTION: After you analyze the given picture and answered the
guide questions, let us proceed to what’s new. Read the direction
carefully.
What’s New?
(Communication)
HOLD ON AMIGO!!!
DIRECTION: After finding out the meaning of important terms that
you will encounter as you read the next part, make time to read the
nature of isotopes below thoroughly.
Isotopes
The word isotope was derived from Greek words isos and topos which means
“the same place”. Isotopes variants of an element are still found in the same
location in the periodic table of elements. This term was introduced by a British
Chemist Frederick Soddy.
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ISOTOPES Subatomic Particles
Isotopes of Oxygen
An oxygen atom with eight protons and eight neutrons and has a mass
number of 16, its name is Oxygen-16. Oxygen-17 has eight protons and nine
neutrons and its mass number is 17. And lastly, an oxygen atom with eight protons
and ten neutrons and has a mass number of eighteen.
Due to the variations of the mass number of the isotopes like Oxygen-16,
Oxygen-17 and Oxygen-18, the relative atomic mass should be computed as
indicated in the periodic table. The atomic mass of oxygen indicated in the periodic
table is 15.999. How this figure obtained? To calculate the atomic mass of an
element, you have to multiply the mass number of each isotope by its percentage
abundance in decimal form. Then add these amounts together to find the relative
atomic mass.
For example, Chlorine-35 makes up 75.53 percent of all the chlorine in
nature, and Chlorine-37 makes up the other 24.47 percent. The relative atomic
mass of chlorine is calculated as follows;
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Isotope Mass number Atomic Mass Percentage Relative Atomic
Number Unit Abundance Mass
Important Isotopes
Isotope Use/s
Sodium-24 Injected into limb to detect blood cloth
Cobalt-60 Detect and Treat Cancer/ use to kill bacteria
Iodine-131 Detect functions of Thyroid Gland
Phosphorous-32 Added to fertilizer to study plant processes
Nitrogen-15 Added to fertilizer to study plant processes
Cesium-137 Use to kill bacteria
Flourine-18 Use for diagnosis and treatment of diseases
Gallium-67 Use for diagnosis and treatment of diseases
Carbon-14 Carbon dating Process
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HOLD ON AMIGO!!!
Did you understand what you have read about isotopes? If yes, let us
proceed to the mini-performance task. You are about to perform the
procedure as instructed in the Mini-performance task. Read and follow
the procedure carefully. Good luck!
Mini-Performance Task
(Collaboration)
Output Presentation
Questions
1. Which filed is the chosen isotope most useful?
___________________________________________________________________________
___________________________________________________________________________
2. Is there any adverse effect in using the chosen isotope? How?
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
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What I Have Learned?
(Critical Thinking)
You have to fill in the L component of the KWL chart to generalize the things
they have learned about the topic.
KWL Chart
Topic Know Want to know Learned
Isotope I have learned that
….
HOLD ON AMIGO!!!
After you have filled-in the L component of the chart, proceed now to
the what I can do.
WORK IN PROGRESS
HOLD ON AMIGO!!!
Congratulations Mi Amigo! You are almost done in this lesson. Let us do
the last part which is the assessment.
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Assessment
(Critical Thinking)
POST-TEST
HOLD ON AMIGO!!!
Congratulations Mi Amigo!!! We are done in this module. You may now
proceed to the next module. See you next time.
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REFERENCES
Acknowledgements
Writer: Gary R. Ramos, MAT-GS
Editors: Ma. Teresa M. Chico- PSDS, Rosalina Aranzamendez- PSDS and Ma. Victoria
Santos- PSDS
Reviewers: Amalia C. Solis- EPS, Rebecca M. Roxas- EPS and Lucita A. Gener- EPS
Management Team: Maria Magdelema M. Lim- Schools Division Superintendent-
Manila, Aida H. Rondilla- Chief Education Supervisor, Lucky S. Carpio- EPS and Lady
Hannah C. Gillo, Librarian II- LRMS
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ANSWER SHEET
Module 5 – Common Isotopes and Their Uses
General Direction: Write your answers here from Pre-Test to Post-Test including
the answers in the activities. Detach and submit this part to your teacher upon
his/her direction which usually given after you have completed this module.
KWL CHART
Topic Know Want to know Learned
Isotope
PRE-TEST
1. 2. 3. 4. 5.
POST-TEST
Isotope Mass number Atomic Mass Percentage Relative Atomic
Number Unit Abundance Mass
___________ ____________ _____________ ____________ _______________
___________ ____________ _____________ ____________
___________ ____________ _____________ ____________
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Activity 1- Isotope Brochure
Output Presentation
Questions
Answer to Questions
1.________________________________________________________________________________
__________________________________________________________________________________
2.________________________________________________________________________________
__________________________________________________________________________________
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