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Natuurwetenskappe

Graad 8

Materie: klassifikasie

Module 20

Metale en nie-metale

  • ‘n Metaal is tipies ‘n harde, blink en sterk element wat elektrisiteit en hitte kan gelei.
  • Yster is die algemeenste metaal in gebruik in ons leefwêreld, maar nie in sy suiwer vorm nie. As yster met ‘n klein bietjie nie-metaal soos koolstof gemeng word, kry ons ‘n allooi .
  • Die studie van metale noem ons metallurgie .
  • Goud is alom die metaal wat ‘n simbool is van welvaart, terwyl platinum en palladium besonder waardevol is vanweë die gebruik daarvan in elektronika en gespesialiseerde ingenieurswese.
  • Staal is alombekend en miljoene ton word jaarliks gebruik in die vervaardiging van items soos wasmasjiene, motors, skepe en treine. Vlekvrye staal, wat onder andere in eetgerei gebruik word, word verkry deur staal in ‘n allooi met harde en blink chroom te vermeng.
  • ‘n Verskeidenheid van stowwe kan by yster gevoeg word om verskillende allooie te vorm, bv. mangaan, fosfor, silikon en swawel.
  • Aluminium word weer baie gebruik in koeldrankblikkies, lere, vensterrame en voorwerpe wat lig moet wees en nie moet roes nie. Aluminium is die derde mees algemene chemiese element op aarde, aangesien dit in ‘n groot deel van die aarde se kors voorkom. Koper en magnesium word gewoonlik bygevoeg om dit vir industriële gebruik geskik te maak.
  • Metale , veral die goud en silwer in elektroniese stroombane (en in tande!) kan suksesvol hersirkuleer word om ons natuurlike hulpbronne te beskerm.
  • Brons is een van die oudste allooie – ‘n mengsel van koper en tin.
  • Geelkoper (“brass”) is weer ‘n allooi van koper en sink.

Klasaktiwiteit

Uitken van metale en nie-metale

  • Identifiseer soveel moontlik van die stowwe in die prent en klassifiseer dit as metale en nie-metale na aanleiding van die hoofelement in die stof.
METALE NIE-METALE
.............................................................. ................................................................

1. Watter eienskappe het jy gebruik om te besluit watter stowwe metale en watter nie-metale is?

2. Dink jy die sekretaresse is welgesteld? Hoekom?

3. Watter stof is besig om die rol van metaal in die industrie oor te neem? Waaruit bestaan die stof?

4. Wat is metallurgie?

5. Wat is staal?

6. Voltooi die volgende tabel:

METALE NIE-METALE
hard en blink .......................................................................
plooibaar en smeebaar
gelei hitte
gelei elektrisiteit

7. Wat is die verskil tussen plooibaar en smeebaar?

Assessering van uitkenning

Kon jy die indeling korrek doen en jou kennis toepas?

[LU 2.2; 2.4]

Assessering

LU 2

Wetenskaplike Kennis

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

Dit is bewys as die leerder:

2.1 sinvolle inligting kan onthou;

2.2 inligting in kategorieë kan plaas;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

Memorandum

KLASAKTIWITEIT: UITKEN VAN METALE EN NIE-METALE

Metale:

Nie-metale:

1. blink, hard

2. goud

3. aanvraag

4. studie van metale

5. allooi

6.

METALE NIE-METALE
hard en blink verkillende kleure; nie hard
plooibaar en smeebaar Bros, breek
gelei hitte Nee
gelei elektrisiteit Nee

7. plooibaar – lang drade uitgerek

smeebaar – dun plate uitgeklop

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
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
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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
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 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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