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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

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