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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

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
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
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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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