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Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

Water:

  • H 2 O
  • Waterstof en suurstof
  • Die elemente suurstof en waterstof het met mekaar verbind. Dit het ‘n nuwe stof, nl. Water, gevorm wat dus uit twee soorte atome bestaan. Die atome het nou saamgebind om ‘n watermolekule te vorm.
  • Ja, die elemente word in ‘n vaste verhouding gekombineer om ‘n nuwe stof te vorm met nuwe eienskappe.

Opdrag2:

1.

  • 500 suurstofatome
  • 1 000 suurstofatome

2. Kombinasie

FORMULE KOMBINASIE
O 2 Suurstofmolekule: Twee suurstofatome
NaCl Natriumchloried (tafelsout): een atoom natrium en een atoom chloried
N 2 O 5 Natriumoksiedmolekule: Twee natriumatome kombineer met 5 suurstofatome
Fe 2 O 3 Ysteroksied: Twee ysteratome kombineer met 3 suurstofatome
MgCl 2 Magnesiumchloried: Een magnesiumatoom kombineer met 2 chloriedatome
CO Koolstofmonoksied: Een koolstofatoom verbind met een suurstofatoom

Leerder afdeling

Inhoud

Aktiwiteit: om die samestelling van stowwe aan die hand van chemiese simbole en formules te kan beskryf [lu 2.3]

Wanneer ons die fisiese of chemiese eienskappe van ‘n stof ken, kan ons dit gebruik om ‘n ander stof te maak. Water is bv. die beste oplosmiddel, want baie stowwe los daarin op. Ons kan die verbinding, water, ook gebruik om gasse soos waterstof en suurstof te maak. Ons kan ook water maak deur hierdie twee gasse te meng.

Ons gebruik chemiese simbole vir elemente en chemiese formules vir verbindings. Hier volg ‘n paar chemiese simbole:

  • Ag (simbool) staan vir silwer
  • Fe staan vir yster
  • Pb staan vir lood
  • Au staan vir goud

Probeer om die samestelling van ‘n watermolekule te illustreer:

  • Skryf die chemiese formule vir water neer.

_____________________________________________________________________

  • Uit watter twee elemente bestaan water?

__________________________________ en _______________________________

  • Wat moes met die twee elemente gebeur het om water te vorm?

Gebruik die woorde elemente , atome en molekule in jou beskrywing.

_____________________________________________________________________

_______________________________________________________________________________________________________________________________________________________________________________________________________________

  • Sou jy sê hierdie verbinding is in ‘n vaste verhouding of kan dit verander word na goeddunke? Motiveer jou antwoord.

_____________________________________________________________________

_______________________________________________________________________________________________________________________________________________________________________________________________________________

_____________________________________________________________________

  • Stel die atoomverbindings van water grafies voor:

Opdrag 2

Probeer nou om die chemiese formule van koolstofdioksied te ontleed:

Koolstofdioksied is ‘n verbinding wat uit twee soorte atome bestaan. Die chemiese formule is:

CO 2

Hierdie chemiese formule beteken dat een koolstofatoom met twee suurstofatome kombineer om koolstofdioksied te vorm. Met ander woorde, ons kan sê dat die verhouding van koolstofatome tot suurstofatome in koolstofdioksiedmolekules 1:2 is.

1. Hoeveel suurstofatome is nodig indien daar:

  • 250 koolstofatome is?_______________________________________________
  • 500 koolstofatome is?_______________________________________________

2. Werk die kombinasies van die volgende formules uit:

FORMULE KOMBINASIE
O 2 ____________________________________________________
NaCl ____________________________________________________
N 2 O 5 ____________________________________________________
Fe 2 O 3 ____________________________________________________
MgCl 2 ____________________________________________________
CO ____________________________________________________

Assessering

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

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer: identifiseer kernidees in die teks, vind patrone in aangetekende data en maak gevolgtrekkings uit inligting in verskeie vorme (prente, diagramme, ens.).

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