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Natuurwetenskappe

Materie en stowwe

Eienskappe en gebruike van materie

Opvoeders afdeling

Memorandum

Opdrag 12:

1. In watter glas los die suiker die vinnigste op?

  • In die glas met die warm water.

2. Verduidelik waarom dit gebeur het.

  • Oplosbaarheid van ‘n stof hang ook af van die temperatuur.

Opdrag 13:

  • (Groepwerk)

1. Hoeveel teelepels suiker kon jy in die glas water oplos?

  • Die hoeveelheid hang af van individuele eksperimente.

2. Gesels in groepe wat jy sou kon doen om nog suiker in dieselfde water op te los.

  • Die water (oplossing) kan warm gemaak word.
  • Wanneer die suikerkristalle (opgeloste stof) nog fyner gemaak word.

Opdrag 14:

Waarneming: Die water het verdamp en klein kristalle het gevorm: kopersulfaatkristalle. Onder die mikroskoop vertoon die kristalle as klein kubusse of blokkies.

Gevolgtrekking : Wanneer ‘n oplossing staan, vind die teenoorgestelde van die oplosproses plaas: die opgeloste stof word weer ‘n vaste stof in die vorm van kristalle.

Opdrag 15:

1. Is die hoeveelheid en die soort oplosmiddel in al drie gevalle dieselfde?

  • Ja.

2. Watter stof het na die eerste teelepel die minste opgelos?

  • Mieliemeel.

3. Is mieliemeel onoplosbaar?

  • Ja.

4. Watter stof het die meeste opgelos?

  • Sout.

Gevolgtrekking: Alle stowwe is nie ewe oplosbaar nie.

Opdrag 16:

1. Wat sien jy?

  • Olie los nie op nie. ‘n Mens bly die oliedruppels in die water sien.

2. Waar is die olie?

  • Terwyl jy roer, lyk dit of dit met die water gemeng is, maar sodra ‘n mens nie meer roer nie, dryf dit weer bo-op die water.

3. Kan olie in water oplos?

  • Nee.

4. Wat is die rede vir bogenoemde antwoord?

  • Oliedeeltjies word baie sterk na mekaar aangetrek. Waterdeeltjies kan nie tussen hulle inbeweeg nie.
  • DUS: onoplosbaar in water.

Opdrag 17:

1. Wat gebeur?

  • Die naftaleen vlokkies los nie op in water nie, maar wel in die brandspiritus.

2. Kan jy verduidelik waarom dit gebeur het?

  • Naftaleen vlokkies is onoplosbaar in water.

3. Voltooi:

Naftaleen los maklik in brandspiritus op, maar is onoplosbaar in water .

LEERDER AFDELING

Inhoud

Aktiwiteit: om die faktore wat die oplosbaarheid van materiale beïnvloed te bepaal [lu 1.1, lu 1.2, lu 1.3]

Die oplosbaarheid van ‘n stof hang af van die:

  • temperatuur;
  • soort stof; en
  • soort oplosmiddel.

OPDRAG 12

Om vas te stel hoe temperatuur oplosbaarheid beïnvloed.

Benodigdhede: suiker

‘n glas met koue water

‘n glas met warm water

‘n teelepel

  • Gooi ‘n teelepel suiker in die glas koue water en ‘n teelepel suiker in die glas warm water.
  • Moenie die water roer nie.
  • Hou goed dop wat gebeur.

Wat neem jy waar?

1. In watter glas los die suiker die vinnigste op?

_____________________________________________________________________

2. Verduidelik waarom dit gebeur het.

_____________________________________________________________________

KOM ONS ONTHOU DIE VOLGENDE BEGRIPPE IN VERBAND MET OPLOSBAARHEID

Suiker is OPLOSBAAR in water.

Die suiker is die OPGELOSTE STOF.

Die water is die OPLOSMIDDEL.

Die suikerwater is die OPLOSSING.

WARMTE bespoedig die oplossingsproses.

  • ‘n Versadige oplossing:

Water kan net ‘n sekere hoeveelheid van ‘n opgeloste stof soos suiker bevat. Wanneer daar niks meer van ‘n opgeloste stof in ‘n oplosmiddel kan oplos nie, sê ons dit is ‘ n versadigde oplossing .

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
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Source:  OpenStax, Natuurwetenskappe graad 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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