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Natuurwetenskappe

Energie-oordrag en kragte

Opvoeders afdeling

Memorandum

(a) Petrol - motor

Gas - stoof

Steenkool - stoomlokomotief

Hout - vuur om warmte te verskaf

Ru-olie - vliegtuigbrandstof word daaruit verkry

(b) Windaangedrewe toestelle - windplaas

Enjins wat deur middel van gebruikte kookolie beweeg

Sonverhittig vir warmte

(c) Voordele en nadele van kernbrandstowwe en fossielbrandstowwe.

(i) Fossielbrandstowwe

VOORDELE NADELE
Redelik beskikbaar. Veroorsaak lugbesoedeling – gee rook en skadelike gasse af.
Kan maklik omgesit word in energie. Hou ‘n brandgevaar in.
Betreklik goedkoop. Ontginning ontsier die omgewing.

(ii) Kernbrandstowwe

VOORDELE NADELE
Beskik oor groot hoeveelhede. Gesondheidsgevare weens radioaktiewe bestraling.
Min omgewingsbesoedeling. Energie moet oor lang afstande vervoer word, aangesien water-verkoeling noodsaak dat sentrales naby die kus gebou moet word.
‘n Klein hoeveelheid lewer baie energie. Radioaktiewe afvalprodukte moet jare lank veilig geberg word totdat radioaktiwiteit verlore gaan.

Leerder afdeling

Inhoud

Aktiwiteit: om ‘n lys te maak van brandstowwe en hulle gebruike [lu 1.3]

(a) Noem vyf alledaagse brandstowwe en een gebruik van elk:

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(b) Dit is baie noodsaaklik vir die mens om ander bronne van energie op aarde te vind. Stel ‘n paar nuwe energiebronne voor, bv. elektriese motors.

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(c) Noem drie voordele en drie nadele van:

(i) Fossielbrandstowwe

VOORDELE NADELE
1. 1.
2. 2.
3. 3.

(ii) Kernbrandstowwe

VOORDELE NADELE
1. 1.
2. 2.
3. 3.

(d) Dink aan al die bronne van energie wat ons tot dusver bespreek het en maak dan ‘n lys van hoe jy energie sal bespaar, bv. skakel die klaskamer se lig af as die son skyn.

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4. Vorms van energie

‘n Mens se liggaam gebruik nie die brandstof (voedsel) in die vorm wat ons dit eet nie. Dit word in eenvoudige stowwe opgebreek en in jou spiere gebêre in ‘n vorm waarin jou spiere dit kan gebruik. Daar is dan energie in hierdie stowwe in jou spiere gebêre. Energie wat in chemiese stowwe soos voedsel en brandstof opgeberg is, word chemiese energie genoem. Alle brandstowwe bevat dus chemiese energie.

Chemiese energie word vrygestel indien die een of ander reaksie plaasvind. As steenkool verbrand word, stel dit warmte vry wat weer gebruik kan word om stoom vir ‘n stoomlokomotief op te wek.

Warmte/hitte-energie word elke dag gebruik. Ons het dit nodig om kos gaar te maak, asook om warm te bly.

Warmte-energie laat die water in die lokomotief se ketel kook en stoom word gevorm.Die stoom dryf die lokomotief aan.

Nie net die son nie, maar ook brandstowwe en elektrisiteit, verskaf aan ons lig. Wanneer elektrisiteit deur die gloeidraad in ‘n gloeilamp beweeg, word die draad warm en gloei dit. Dit stel dan ligenergie vry, asook ‘n klein hoeveelheid warmte-energie. Sommige wurms, vuurvliegies en visse straal ook ligenergie uit.

Kinetiese energie word deur beweging moontlik gemaak. Bewegende water kan ‘n waterwiel laat draai, terwyl wind weer ‘n windpomp kan aandryf.

Energie wat in dinge gestoor word en wag om op een of ander manier vrygestel te word, word potensiële energie genoem. Die veer van ‘n windbuks wat gelaai is, beskik oor die vermoë om te skiet. Ons sê dus die gespande veer beskik oor potensiële energie.

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 1.3: Dit is duidelik wanneer die leerder data evalueer en bevindings kommunikeer: veralgemeen ten opsigte van ‘n relevante aspek en beskryf hoe die data die veralgemening steun.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
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
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
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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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