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Al PrIsProductionsroudlyresentsACIDS,BASES
Indicators
Al PrIsProductions
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Objectives
Target Audience
Duration Two Period lessons ( 1 hour)
Sec 3 ExpressScience(Chemisty)
a) Suggest a suitable method for the identification of pH on
different substances.
b) Students are able to plan their own investigations in solving a
problem.
c) Students are able to effectively source the Internet to extract the
information required.
d) Students are able to hypothesize and write a report on theirinvestigation.
e) Solve the problem of the dying crops..
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THE PROBLEM
Farmer Brown
is my name & Ihave a story to
tell. You see, I
own a farm.
I harvest
maize every
year. Then
one day, the
rain came.
Something
happened.
All my crops
died
after that.
I am very
puzzled.Can you help
me solve this
problem?
SOLVE
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The Story
Solve theproblem
To refresh
your knowledge
Some useful
websites
Problem
Solving
worksheet
Click here to find out what Farmer Brown is
troubled over.
Click here to help Farmer Brown solve hisproblem.
Click here to test yourself on your concepts on
Acids, Bases & Indicators.
Click here for websites on Acids, Bases &
Indicators.
Click here to print out &
write in your answers.Worksheet 2Worksheet 1
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Acids Alkal is
ACTION WITH LITMUS PAPER
Turns red
litmus paper
blue
Turns blue
litmus paper
red
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Acids
REACTIONS WITH OTHER SUBSTANCES
Reacts with metals
to give off salt and
hydrogen gas
Reacts with metal
carbonates to give
off salt and carbon
dioxide gas
MetalHydrogen
GasCarbon
Dioxide
Metal
Carbonates
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Alkal is
REACTIONS WITH OTHER SUBSTANCES
Reacts withAmmoniumsalts to
giveoff salts,ammonia gas andwater when warmed
Ammonia
Gas
Ammonium
Salts
HEAT
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Acid
NEUTRALISATION
Acid + Alkali = Salt + Water
Salt
Alkali
Water
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Why are the crops dying?
Could it be due to the soil ? Could it be due to the rain ?
How would you test ???
Write your suggestion in the worksheet provided.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Soil.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/Soil.htm7/27/2019 Acid Bases Indicators
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Should I add an alkali ? Should I add a carbonate ?
Which one would you use ???Write your answer in the worksheet provided.
How to save the dying crops?
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If you have added an alkali
The crops did not grow well when
an alkali was added.
WHY ?
Write your answer in the worksheet.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/PED%20513/soil.htm7/27/2019 Acid Bases Indicators
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If you have added a carbonate
You have save both Farmer Brown &
his farm.
WHY ?Write your answer in the worksheet.
http://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/PED%20513/soil.htm7/27/2019 Acid Bases Indicators
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Encyclopedia
CHEMTUTOR
Online Tutorial
FROM NEW
ZEALND
Click here to find out more from the
Encyclopedia website.
WHAT IS AN ACID AND A BASE?
Click here to test yourself on your concepts on
Acids, Bases & Indicators online.
Do sections 1 and 15
YET ANOTHER USEFUL WEBSITE
Soil Rain
http://www.encyclopedia.com/articles/00084.htmlhttp://www.chemtutor.com/acid.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.chemtutor.com/acid.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Soil.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Rain.htmhttp://localhost/var/Documents%20and%20Settings/skpwong/Local%20Settings/Temp/AcidBasesIndicators/html/Soil.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemtutor.com/acid.htmhttp://www.carlton.paschools.pa.sk.ca/chemical/equilibrium/abindicators.htmhttp://www.chemistry.co.nz/acids_and_bases.htmhttp://www.science.ubc.ca/~chem/tutorials/pH/index.htmlhttp://www.chemtutor.com/acid.htmhttp://www.encyclopedia.com/articles/00084.html7/27/2019 Acid Bases Indicators
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1) Sounds used in this microlesson were taken fromMicrosoft clipart and www.soundcentral.com.
This author of this website allows the use of his sounds
for educational purposes.
2) Pictures used were taken from Microsoft Clipart Gallery
3) 1999-2000 http://www.barrysclipart.com/The author of
this website allows the use of his clip art as long as credits
is made.
Prepared by: Aldrin Thomas John & Teng WeiSyan, PrisciliaDIVISION OF INSTRUCTIONAL SCIENCE
national institute of educationcopyright 2000
ACKNOWLEDGEMENT
End
http://www.soundcentral.com./http://www.barrysclipart.com/http://www.barrysclipart.com/http://www.soundcentral.com./http://www.soundcentral.com./