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Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

  • Organies: lewende; anorganiese: nie-lewende
  • Waarneming: Die asyn het gereageer met die melk en ‘n ‘nuwe’ stof met ‘nuwe’ eienskappe is gevorm.
  • Gevolgtrekking: Die spesiale eienskappe van melk en asyn is gebruik om ‘n nuwe sintetiese stof te vervaardig.
  • Gebruike van ‘nuwe’ stof: As prop om iets te verseël; beskerming; versiering, ens.
  • Soos in gegewe illustrasie, maar met die houers wat gebruik is en die bron van hitte (doel: oefen die leerder se vermoë om dit wat hy waarneem met ‘n tekening voor te stel.)

Leerder afdeling

Inhoud

Aktiwiteit: om plastiek as ‘n voorbeeld van sintetiese of mensgemaakte stowwe te ondersoek [lu 1.2, lu 1.3]

Plastiek is ‘n mensgemaakte stof. Plastiek word gemaak omdat dit spesiale eienskappe het en omdat dit goedkoper is om te vervaardig as om natuurlike stowwe te vind. Plastiek is byvoorbeeld sterk en waterdig. Dit kan baie nuttig gebruik word in verpakkings en as beskerming vir ander stowwe dien.

EKSPERIMENT: MAAK JOU EIE PLASTIEK

Alhoewel die meeste soorte plastiek van petroleumolie gemaak word, kan ‘n soortgelyke plastiek vervaardig word deur melk te gebruik. Melk bevat koolstof en kan dus as ‘n organiese stof geklassifiseer word.

  • Slaan die betekenis van “organiese” in die woordeboek na.

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BENODIGDHEDE:

20ml asyn;

‘n kookpot;

200 ml volroom melk

METODE:

  • Gooi die melk in die pot en bring dit stadig tot kookpunt.
  • Voeg 20 ml asyn by die melk.
  • Hou aan met roer totdat die mengsel rubberagtig word.
  • Verwyder dit van die hitte en laat dit deeglik afkoel.
  • Spoel die mengsel af met water.

WAARNEMING

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GEVOLGTREKKING:

_____________________________________________________________________

_____________________________________________________________________

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  • Moontlike nuttige gebruike van die “nuwe” stof:

_____________________________________________________________________

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  • Gebruik die woordelikse beskrywing van die eksperiment en maak ‘n skets of diagrammatiese voorstelling van die eksperiment.

ASSESSERING

LU PUNTE VLAK VLAKAANDUIDER
1 Minder as 5 1 Die skets/voorstelling maak geen sin nie, met geen waarneming en gevolgtrekking nie
5 – 7(25% – 39%) 2 ‘n Basiese voorstelling met baie min waarneming en geen gevolgtrekking nie
8 – 13(40% – 69%) 3 ‘n Bevredigende voorstelling/skets met basiese waarneming, maar amper geen gevolgtrekking nie
14 – 20(70% – 100%) 4 ‘n Volledige voorstelling met byskrifte van die eskperiment met waarmeming en gevolgtrekking

Assessering

Leeruitkomste 1: Die leerder is in staat om met selfvertroue op weetgierigheid oor natuurlike verskynsels te reageer, en om binne die konteks van wetenskap, tegnologie en die omgewing verbande te ondersoek en probleme op te los.

Assesseringstandaard 1.2: Dit is duidelik wanneer die leerder ondersoeke uitvoer en data versamel: organiseer en gebruik apparaat/toerusting of bronne om inligting in te win en te noteer;

Assesseringstandaard 1.3: Dit is duidelik wanneer die leerder data evalueer en bevindings kommunikeer: veralgemeen in terme van relevante aspekte en beskryf hoe die data die veralgemening onderskryf.

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
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
what is the Synthesis, properties,and applications of carbon nano chemistry
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.
how to fabricate graphene ink ?
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
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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