<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

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

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

Malvalekkers

  • 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

Inhoud

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.

_____________________________________________________________________

______________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Assessering

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 are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
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
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask