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Natuurwetenskappe

Graad 4

Lewe en lewenswyse

Module 23

Voorsiening van skoon water

Aktiwiteit:

Om die voorsiening van skoon water aan huishoudings te beskryf

[lu 3.2]

Wanneer ons water wil hê, draai ons net ‘n kraan oop. Het jul al ooit gewonder waar daardie water vandaan kom?

Kom ons toer saam met Walter Waterdruppel op sy reis na ‘n kraan.

a. Walter in die rivier op pad na die ________________________________

b. Van die opgaardam gaan hy met

_________________________________

na ‘n munisipale dam by ‘n dorp of ‘n stad.

c. Walter verlaat die munisipale dam deur ‘n

dik ___________

d. en hierdie pyp vertak in________

e. Om Walter op sy reis te help, moet jy die _______ oopdraai.

(a) Verduidelik hoekom ‘n kraan wat toe is, steeds kan drup en sodoende water mors.

(b) Noem drie redes waarom ‘n gestremde persoon, of ouer en klein kindertjies dit moeilik mag vind om ‘n kraan oop te draai.

Opdrag:

Vind uit waarvandaan jou dorp of stad se water kom.

Waarom is opgaardamme waardevol? Gee twee redes.

Vind ook uit watter groot opgaardam in jou omgewing is.

  1. Watter groot opgaardam kry ons in die Oranjerivier?
  1. Watter soort damme voorsien water aan dorpe en stede?
  1. Watter groot dam voorsien Johannesburg van water?
  1. Waarin word water wat op huise se dakke val, opgevang?
  1. Watter dam is naby die Paarl?

Assessering

LU 3

WETENSKAP, DIE SAMELEWING EN DIE OMGEWING Leerders is in staat om begrip van die onderlinge verband tussen wetenskap en tegnologie, die samelewing en die omgewing te toon.

Dit is duidelik wanneer die leerder:

3.1   wetenskap en tegnologie in die konteks van geskiedenis en inheemse kennis verstaan;

3.2   die impak van wetenskap en tegnologie verstaan;

3.3       vooroordeel in wetenskap en tegnologie herken.

Memorandum

Verspreiding van water

Walter Waterdruppel se reis na ‘n kraan:

  1. Die reën kom uit die wolke op die aarde.
  2. Opgaardam
  3. Pypleiding
  4. pyp dunner pype
  5. kraan
  6. Daar is net twee plekke waar ‘n kraan kan lek: by die rubberwaster waar die water uitkom en by die grys pakstuk waar die watervloei beheer word.
  • Die kraan is nie reg toegedraai nie.
  • Die waster het dalk barsies in of dit is platgedruk.
  • Daar is dalk sandkorreltjies wat die rubber beskadig binne-in die kraanomhulsel.
  • Wanneer water by die boonste deel uitlek, moet die moertjie by die boonste draaistam net vaster gedraai word.

g) 1. hulle hande is dalk te klein of te swak

  1. krane in openbare plekke wat deur die publiek gebruik word, behoort lang handvatsels te hê wat maklik oopdraai
  2. die kraan is dalk onnodig styf toegedraai

Opdrag

Kom ons vind uit:

  • Waarom is opgaardamme waardevol?
  • Altyd water vir huishoudelike gebruik (bv. In winter as rivier leeg is)
  • Besproeiing
  • Gariepdam
  • Munisipale opgaardamme
  • Vaaldam
  • Tenks
  • Wemmershoekdam

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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Source:  OpenStax, Natuurwetenskappe graad 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11097/1.1
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