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Natuurwetenskappe

Graad 8

Materie: klassifikasie

Module 22

Skeiding van mengsels

  • Afhangend van die tipe mengsel kan verskillende metodes van skeiding toegepas word.

Die onderwyser gaan die volgende METODES verduideliken moontlik demonstreer:

  • Handsortering – sorteer t.o.v. groottes, vorm en kleure
  • Filtrasie – een van stowwe is oplosbaar; indamping
  • Verdamping – los op in water en damp in
  • Skeitregter – twee vloeistowwe met verskillende digthede
  • Distillasie – gebruik 'n kondensor en distilleerfles; verhit en verdamp en kondenseer

APPARAAT:

Skets van filtreer- en distilleerapparaat, asook skeitregter.

Aktiwiteit: kies skeidingsmetode

MENGSEL METODE
Sand en sout
Boontjie en grondboontjies
Koeldrankstroop en water
Olie en water
Verskillende muntstukke

Opdrag

Verduidelik stapsgewys met behulp van sketse hoe jy te werk sal gaan om:

a) sand en sout te skei;

b) koeldrankstroop en water te skei.

1. Watter metode sou jy gebruik om varswater uit seewater te kry?

2. Hoekom maak die mens nie van die metode gebruik om varswaterbronne aan te vul nie?

3. Wat is die verskil tussen 'n distillaat en 'n filtraat?

4. Wat is fraksionele distillasie en noem twee bedrywe waar dit gebruik word.

Projek

Hoe sou jy water en alkohol skei?

  • Vind ook meer uit oor fraksionele distillasie .
  • Wenk: gebruik die kookpunte waaroor jy vroeër meer moes uitvind (leereenheid 3).
  • Sketse is belangrik!
  • Handig projek in op datum deur onderwyser bepaal.

Assessering van projek

Kon jy die projek beplan (AS 1.1), data insamel (AS 1.2) en bevindinge evalueer en kommunikeer (AS 1.3), asook enige kennis toepas (AS 2.4)?

[LU 1.1; 1.2; 1.3; 2.4]

Assessering

LU 1

Wetenskaplike Ondersoek

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.

Dit is bewys as die leerder:

1.1 ondersoeke kan beplan;

1.2 ondersoeke kan uitvoer en data kan insamel;

1.3 data kan evalueer en bevindinge kan kommunikeer.

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

Skeiding van mengsels

AKTIWITEIT: Kies skeidingsmetode

MENGSEL METODE
Sand en sout Filtreer
Boontjie en grondboontjies Handsortering
Koeldrankstroop en water Distillasie
Olie en water Skeitregter
Verskillende muntstukke Handsortering
  • Sketse – regte apparaat

1. distillasie

2. koste

3. distillaat – vloeistof kondenseer na distillasie

filtraat – vloeistof wat filtreer

4. filtrasie deur verskillende kookpunte, bv. olieraffinering en spiritualieë- (alkohol) bedryf

PROJEK:

  • Alkohol kook by 79 °C – fraksionele distillasie verwyder alkohol; water bly agter
  • Regulering van temperatuur met termometer uiters belangrik

Skets van Liebiegkondensor-opstelling belangrik.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
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
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
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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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