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Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

  • Die houtblokkie het die grootste massa.

1. Digtheid = massa per volume Dus (a) = 1,6 g/cm 3 (b) = 2,5 g/cm 3

(c) 8,7 g/cm 3 (d) = 7,7 g/cm 3 (e) 0,8 g/cm 3

2. Gebruik twee vloeistowwe wat nie meng nie. Gooi hulle in ‘n glasbeker. Die vloeistof met die laagste digtheid sal op die ander vloeistof dryf, bv. olie op water.

Leerder afdeling

Inhoud

Aktiwiteit: om die begrip digtheid te kan beskryf en te kan toepas [lu 1.1, lu 2.4]

Gooi ‘n 50c-muntstuk en ‘n houtblokkie in ‘n glasbak halfvol met water. Die muntstuk sink en die houtblokkie dryf.

  • Watter een het die grootste massa?

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Die blokkie weeg swaarder as die muntstuk, maar dryf omdat dit ‘n kleiner digtheid het. Wanneer ons die massa en volume van ‘n stof kombineer, werk ons met die digtheid van ‘n stof.

Die onderstaande vyf ewe groot blokkies is van verskillende stowwe gemaak. Elkeen het ‘n volume van presies 10 kubieke sentimeter (10 cm3). Die benaderde massa van elkeen word aangetoon.

Ons kan die massas van die vyf stowwe vergelyk omdat hulle almal dieselfde volume het. Die massa in gram van 1 cm з van ‘n stof word sy digtheid genoem.

1. Skryf nou die digtheid van elk van die blokkies neer.

(a) __________________________________________________________________

(b) __________________________________________________________________

(c) __________________________________________________________________

(d) __________________________________________________________________

(e) __________________________________________________________________

2. Beskryf hoe jy met ‘n glasbeker en twee vloeistowwe sal illustreer dat die digtheid van vloeistowwe ook verskil. (Wenk: besluit eers watter twee vloeistowwe jy sal gebruik).

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Assessering

Leeruitkomste 1: 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.

Assesseringstandaard 1.1: Dit is duidelik wanneer die leerder ondersoeke beplan: beplan eenvoudige toetse en vergelykings en bedink hoe om dit deeglik uit te voer.

Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.4: Dit is duidelik wanneer die leerder kennis toepas: pas konseptuele kennis toe deur ‘n begrip wat onderrig is met ‘n variasie van ‘n soortgelyke situasie in verband te bring.

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 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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