<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Materie, meting en reaksies

Reaksies tussen soorte materie: sure en basisse

Opvoeder afdeling

Memorandum

A. Asyn: Dit raak ligter van kleur

Lemmetjiesap: Dit raak melkerig en ligter

Koeksoda: Dit raak donker en skuimerig

Magnesiamelk: Dit raak ligter en melkerig

Suur en tee: Ligter

Alkalie en tee: Donkerder

Broomtimolblou (BTB) as indikator

Water: Neutraal

Wynsteensuur: Suur

Sout: Suur

Ammoniak: Basis

Lakmoespapier as indikator

Bakpoeier: basis Bier: suur

Koeksoda: basis Versiersuiker: neutraal

Skeerroom: basis Haarsjampoe: basis

Melk: basis Koffie: suur

Slaaisous: suur Gaskoeldrank: suur

Leerder afdeling

Inhoud

Aktiwiteit: om sure en basisse met behulp van indikatore te kan identifiseer [lu 1.2, lu 1.3]

Aangesien daar baie stowwe is wat gevaarlik is om aan te proe, gaan ons ander metodes gebruik om vas te stel of stowwe suur of alkalies is.

Ons gaan gebruik maak van:

  • swart tee
  • broomtimolblou
  • lakmoespapier / lakmoesoplossing

Wanneer ‘n motoris wil links draai, gebruik hy die flikkerlig om aan te dui wat hy van plan is om te doen. Die flikkerlig dien as ‘n indikator. Bogenoemde middels gaan vir ons aandui of stowwe sure, alkalies of neutraal is en word chemiese indikators genoem.

Swart tee

Voeg ongeveer 5 cm³ (5 ml) swart tee by elke proefbuis, soos wat in die volgende skets aangedui word.

Voeg dan:

  • ‘n bietjie asyn in proefbuis nr. 1
  • ‘n bietjie lemmetjiesap in proefbuis nr. 2
  • ‘n bietjie koeksoda in proefbuis nr. 3
  • en ‘n bietjie magnesiamelk in proefbuis nr. 4 .

Die tee in die vyfde proefbuis sal gebruik word om veranderings in ander proefbuise waar te neem.

  • Kyk wat gebeur en voltooi die gegewe tabel om jou waarneming te noteer:
Stof Beskryf die kleurverandering
Asyn _____________________________________________
Lemmetjiesap _____________________________________________
Koeksoda _____________________________________________
Magnesiamelk _____________________________________________

Voltooi die volgende gevolgtrekkings:

  • Wanneer ‘n suur (asyn/lemmetjiesap) by swart tee gevoeg word, word die oplossing

_____________________________________________________________________

_____________________________________________________________________

  • Indien ‘n mens egter ‘n alkaliese stof (koeksoda/magnesiamelk) by swart tee voeg, word die oplossing

_____________________________________________________________________

_____________________________________________________________________

Broomtimolblou (BTB)

Voeg ongeveer 5 cm³ (5 ml) suiwer water by elke proefbuis soos in die volgende skets aangedui word.

Voeg 5 druppels BTB by die water in elke proefbuis. Die BTB behoort nou ‘n groenerige kleur te hê. Neem die volgende stelling in ag wanneer jy toets of die daaropvolgende stowwe sure of basisse is:

Broomtimolblou word geel in ‘n suuroplossing, maar vertoon blou as dit met ‘n basis in verbinding kom. Die kleur van BTB verander nie in ‘n neutrale oplossing nie.

Stof Suur Basis Neutraal
  • Water
  • Wynsteensuur
  • Sout
  • Ammoniak

Lakmoespapier

Gebruik blou of rooi lakmoespapier om vas te stel of die volgende stowwe sure of basisse is.

Plaas ‘n druppel van elke oplossing op die lakmoespapier. Indien die stof in poeiervorm is, los dit eers op in water. Onoplosbare stowwe kan met water gemeng word om ‘n pasta te vorm.

Bakpoeier ______________ Bier ______________
Koeksoda ______________ Versiersuiker ______________
Skeerroom ______________ Haar sjampoe ______________
Melk ______________ Koffie ______________
Slaaisous ______________ Gaskoeldrank ______________

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 1.2: Dit is duidelik wanneer die leerder ondersoeke uitvoer en data versamel: organiseer en gebruik apparaat/toerusting of bronne om inligting in te win en te noteer.

Assesseringstandaard 1.3: Dit is duidelik wanneer die leerder data evalueer en bevindings kommunikeer: veralgemeen in terme van relevante aspekte en beskryf hoe die data die veralgemening onderskryf.

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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 7' conversation and receive update notifications?

Ask