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Natuurwetenskappe

Energie-oordrag en stelsel

Verskillende vorme van energie

Opvoeders afdeling

Memorandum

Opdrag 1:

Maak seker dat die leerders die blokdiagram kan lees. Aanvaar hul eie kombinasies, maar maak seker dat hulle so na as moontlik aan 11 760kJ kom. Voedselkombinasies moet ook aanvaarbaar wees, bv. boontjies en roomys is minder aanvaarbaar as 3 snytjies hoender en gebakte boontjies.

Leerder afdeling

Inhoud

Aktiwiteit: om chemiese energie as energiebron te kan bespreek [lu 2.3]

Die son as bron van energie

  • Die geskatte temperatuur van die son is ongeveer 20 000 000 °C. Die son verskaf reeds miljoene jare energie aan plante en diere op aarde. Die meeste van die energie gaan ongelukkig verlore, omdat daar tot op hede nie ‘n doeltreffende metode gevind is om dit op groot skaal vir latere gebruik te stoor nie.

Plante as vasleggers van sonligenergie

  • Plante stoor egter hierdie energie op ‘n effektiewe manier. Die energie van die son word in die plante se blare omgeskakel na ‘n ander vorm van energie. Hierdie proses word fotosintese genoem.

Plante berg die energie in die vorm van koolhidrate. Deur ‘n gebalanseerde dieët te volg, kry ons genoeg energie van plant- sowel as diermateriaal om ons dagtake met genoeg lus en ywer aan te pak. Sonder voldoende energie sal ons lusteloos en moeg voel.

Kos as stoorplek van energie in chemiese vorm

  • Ons meet die hoeveelheid energie in kos in kilojoules (kJ). Deur noukeurig te let op die inligting op voedselprodukte se etikette, kan ons bepaal hoeveel energie ons inneem.

Die volgende blokgrafiek toon die kilojoules van ‘n paar kossoorte. ‘n Twaalfjarige met ‘n gemiddelde massa van 40 kg het nagenoeg 11 760 kJ per dag nodig.

Voedselsoorte

Gebruik die blokgrafiek en werk uit wat jy in een dag behoort te eet om genoeg energie te verkry. Dit is belangrik dat jy die kalibrering (skaalindeling) van die grafiek sal verstaan voordat jy die assessering aanpak.

DIEËT VIR EEN DAG!!

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OPVOEDERASSESSERING: KRITERIA 1 2 3 4
  1. Kalibrering korrek geïnterpreteer
___ ___ ___ ___
  1. Volle kJ-telling (11 760 kJ)
___ ___ ___ ___
  1. Sinvolle voedselkombinasies
___ ___ ___ ___
  1. Gebruik van vol en halwe of kwart porsies
___ ___ ___ ___

Assessering

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

Assesseringstandaard 2.1: Dit is duidelik wanneer die leerder inligting interpreteer.

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
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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