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Natuurwetenskappe

Graad 8

Materie: klassifikasie

Module 15

Faseveranderings van materie

Voorkennis:

  • Materie bestaan in drie fases: vastestowwe, vloeistowwe en gasse

Klasaktiwiteit: leesvaardigheid

Die avonturiers kamp in die Cederberge

in die hartjie van die Kaapse winter.

Oornag het dit gesneeu.

Die volgende oggend blink die sneeu.

Stadig maar seker smelt die ys in die wintersonnetjie.

Die stroompies water loop af na die rivier.

Een van die kampeerders skep ‘n houer vol rivierwater.

Hy steek ‘n vuurtjie aan; kyk hoe vinnig kook die water

dat die stoom so staan!

1. Benoem al die fases van water uit die stuk – gebruik al die beskrywende woorde.

2. Waar kom die energie vandaan vir:

a. die ys wat smelt?

b. die water wat stoom?

3. a. In watter fase is die waterdeeltjies die heel vryste om te beweeg?

b. In watter fase is daar die sterkste aantrekkingskrag tussen die waterdeeltjies?

4. Die fases van water speel ook ‘n groot rol in die natuur. Dit maak die WATERSIKLUS moontlik. Vul die volgende in:

Die watersiklus

5. Die volgende sketse stel faseveranderinge voor. Sê in elke geval wat met die water gebeur:

Assessering vir leesvaardigheid

Kon jy die regte afleidings uit die leesstuk maak?

[LU 2.3]

Opdrag

Vind uit:

(Jy kan die aangeduide webadresse of enige ander naslaanbron gebruik.)

Hoekom ys op water dryf.– www.geocities.com (iceberg+ float)

Hoe sneeuvlokkies vorm.– google.com (snowflakes)– www.edu.pe.ca/rural/chemist

Waarom alkohol (soos in Schnapps of witblits) nie in jou vrieskas vries nie.

Wat die kookpunt van stowwe soos kookolie en alkohol is.– www.ucc.ie – (boiling points)

Plak of skryf die inligting op die teenblad.

Assessering vir opdrag

Is die inligting versamel en opgeteken?

[LU 1.3]

7. Elke stof het sy eie smeltpunt en vriespunt.

Water vries by

Water kook by

 Het jy geweet? 

‘n Vierde fase van materie is reeds ontdek - ons noem dit PLASMA.

Dit bestaan net by uitermate hoë temperature en in sterre.

Lees meer op oor PLASMA!

http://scsc.essortment.com

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

Faseveranderings van materie

1. sneeu; ys (vastestof) – water; rivierwater (vloeistof) – stoom (gas)

2. a) son b) vuur

3. a) stoom (gas) b) sneeu/ys

4. 1 – verdamping; 2 – transpirasie; 3 – wolkvorming/kondensasie

4 – neerslag (reën, sneeu ens)

5. kondenseer; smelt; vries(kristalliseer); verdamp

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
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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
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Kyle
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Adin
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research.net
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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
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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
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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.
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s.
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s. Reply
of graphene you mean?
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or in general
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in general
s.
Graphene has a hexagonal structure
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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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