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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

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Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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Damian Reply
absolutely yes
Daniel
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Akash Reply
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Anassong
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s. Reply
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Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
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Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
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SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
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Sanket Reply
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Damian Reply
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Cied
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I start with an easy one. carbon nanotubes woven into a long filament like a string
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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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