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Materie, meting en reaksies

Materie en meting

Opvoeder afdeling


Voorbeelde van fisiese verandering : ‘n pan wat verhit word; tee wat afkoel

Voorbeelde van chemiese verandering: vuurhoutjie wat brand; brood wat rooster


  • Ja, dit smaak anders, effens na brand
  • Ja, dit het swart en poeieragtig geword
  • Chemiese verandering : Dit is permanent, die chemiese reaksie het die suiker in koolstof verander.

Leerder afdeling


Aktiwiteit: om fisiese en chemiese veranderinge in stowwe to ondersoek en te kan bespreek [lu 2.3]

Mense gebruik verskillende natuurlike stowwe en verander dit in iets anders. Stowwe word met ander gemeng, verhit, geskei, opgelos of met elektrisiteit behandel ten einde die verandering teweeg te bring. Sommige veranderinge is egter nie blywend nie, maar ander is weer nie omkeerbaar nie. Ons onderskei tussen fisiese en chemiese verandering.

Fisiese Verandering

Wanneer versuikerde heuning in ‘n pot verhit word, raak dit weer vloeibaar. Sodra dit egter weer afkoel en blootgestel word aan lug, versuiker dit weer. Geen nuwe stowwe is gevorm nie, die eienskappe is nog presies dieselfde en ons noem hierdie verandering ‘n fisiese verandering. In die vorige eksperiment het die oranje kwikoksied weer swart geword nadat dit afgekoel het (fisiese verandering).

Chemiese Verandering

Wanneer rou pannekoekdeeg in warm olie gegooi word, gebeur daar iets. Die voorkoms van die deeg verander. Dit is nie meer loperig nie en word hard. Die verandering wat plaasgevind het, is permanent. Veranderings wat permanent is en wat iets nuuts voortbring, word chemiese veranderings genoem. Die nuwe stof se eienskappe verskil van die oorspronklike stof s’n. Die kwikoksied het ook ‘n chemiese verandering ondergaan toe dit ontbind het in kwik en suurstof.

Noem nog twee voorbeelde van fisiese en twee voorbeelde van chemiese veranderinge.





Probeer die volgende:

Bring malvalekkers skool toe. Sit dit op die punt van ‘n vurk en hou dit oor ‘n vlam. Beantwoord dan die volgende vrae.

  • Het die smaak verander nadat dit verhit is? Wag totdat dit afkoel voordat jy proe.
  • Het die voorkoms verander? Beskryf die verandering.
  • Is dit ‘n chemiese of ‘n fisiese verandering? Motiveer jou bevinding.






Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer: identifiseer kernidees in die teks, vind patrone in aangetekende data en maak gevolgtrekkings uit inligting in verskeie vorme (prente, diagramme, ens.).

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
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Stoney Reply
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Adin Reply
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Damian Reply
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Introduction about quantum dots in nanotechnology
Praveena Reply
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Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
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Damian Reply
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s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
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Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
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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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