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Natuurwetenskappe

Graad 5

Materiaal

Module 28

Natuurlike materiale

Aktiwiteit:

Om die aard en gebruike van natuurlike materiale te bespreek

[lu 1.1; 1.2.1; 1.2.2; 1.3.1; 3.2]

1. Hout

Hout kom van bome wat dwarsoor die wêreld òf natuurlik groei, soos in woude, òf deur die mens in die vorm van plantasies aangeplant word.

Wanneer bome, veral in plantasies, volgroei is, word dit afgekap. Dun hout, soos takke en die stamme van swak bome, word verpulp om papier te maak. Dik stamme word na die saagmeule vervoer. Daar word dit in planke gesaag en gedroog. Droë hout word timmerhout genoem.

Hout kan vir baie dinge gebruik word, soos vir meubels, deure, kissies en speelgoed. Hout kan ook gebruik word om huise te bou. Musiekinstrumente soos die kitaar en viool word ook van hout gemaak. Die wiel van ‘n wa is ook destyds van hout gemaak.

Die verpulping van hout vir papier word in fabrieke gedoen. Die hout word met water en chemikalieë gemeng en in dun, gladde velle uitgerol en gedroog om as papier gebruik te word.

Ander gebruike van hout

Kyk na jou potlode of potloodkryte. Waarvan is dit gemaak?

Afvalplanke word dikwels in informele nedersettings gebruik om vinnig ‘n “huis” aanmekaar te slaan, aangesien dit darem skuiling bied.

In tropiese lande waar dit baie reën, word houthuise dikwels op pale gebou sodat die inwoners droog bly gedurende die reënseisoen en ook om ongewenste “gaste”, soos slange, uit te hou.

Indien hout goed versorg word, kan dit wisselende weersomstandighede weerstaan en huisbewoners teen koue of hitte beskerm.

Groepwerk

Maak ‘n plakkaat met die volgende inligting:

Hoe hout gebruik word in die boubedryf

OF

Produkte wat van hout gemaak is

Prente of sketse ter illustrasie sal in jul guns tel.

2. Keramiek en klei

Daar is volop klei in die kors van die aarde beskikbaar. Nie alle klei is op dieselfde manier saamgestel nie. Keramiek word gevorm deur klei wat gebak word. Verskillende soorte klei gee verskillende soorte keramiek.

Kyk watter voorwerpe van keramiek gemaak word.

Keramiek word as elektriese isoleerders gebruik – dit verhoed dat elektrisiteit in die staalstutte of -rame vloei.

Kom ons observeer hoe ‘n keramiekpot uit klei gemaak word:

1. Klei wat klam is, kan makliker in ‘n spesifieke vorm geskep word. So lyk die samestelling van nat klei:

2. Nadat ‘n kleipot gemaak is, word dit teen kamertemperatuur gelaat om stadig droog te word. Die deeltjies of molekules water in klei verdamp en die klei krimp en word hard.

So lyk die samestelling van die klei nou.

3. As die klei droog is, word dit in ‘n pottebakkersoond gebak (erdeware teen ± 980°C en steenware teen ongeveer 1 200°C tot 1 700°C).

So lyk die samestelling van die klei nou.

Nou is daar te min ruimte tussen die deeltjies klei of molekules om water deur te laat.

Opdrag 1:

Kyk na die keramiekpot met blomme en verduidelik die volgende:

  1. Hoe bly die blomme vars?
  1. Waarom lek die pot nie?
  1. Dink jy vloeistowwe kan in keramiekhouers gehou word?
  1. Noem ‘n paar voorbeelde waar keramiek daagliks gebruik word:
  1. Waarvoor het mense lank gelede klei gebruik?

Questions & Answers

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
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
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
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
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