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Natuurwetenskappe

Materie, meting en reaksies

Reaksies tussen soorte materie: sure en basisse

Opvoeder afdeling

Memorandum

Dit is baie belangrik dat u vooraf seker maak dat die stowwe wat die groepe bymekaar gemaak het, veilig is om aan te proe.

Swart tee as indikator.

SURE NEUTRAAL BASISSE

Sout en Asyn Vanieljegeursel (soet) Kakaopoeier

Speserye Kitssop (sout) Groen peper

Borrie Appelasyn Koeksoda

Suurlemoensap Sjokolade

Leerder afdeling

Inhoud

WAARSKUWING

  • Ons almal het sintuie om die verskillende aspekte van ons omgewing waar te neem. Jou tong is die sinsorgaan wat jou in staat stel om deur proe die smaak van stowwe waar te neem. Moet egter nooit aan stowwe proe nie, tensy jy baie seker is dat dit veilig is! Dikwels bewaar mense stowwe in houers sonder om die nodige etikette daarop aan te bring. Gevaarlike stowwe kom gereeld in en om ons huis voor, bv. batterysuur, ammoniak en swembadsuur. Onthou dus: moenie aan iets proe nie, tensy jy dit as ‘n veilige stof geïdentifiseer het.

Aktiwiteit: om sure en basisse in en om die huis te kan identifiseer [lu 1.2, lu 2.2]

Die meeste sure het ‘n suur smaak, terwyl die meeste basisse bitter smaak. Hierdie smake word deur die agterste gedeelte van die tong waargeneem. Ons proe ook dikwels met die voorste gedeelte van die tong stowwe wat soet of sout smaak. Hierdie stowwe is nie sure of basisse nie, maar is neutraal.

Loer so ‘n bietjie in Ma se kombuiskaste en bring van die volgende items saam skool toe:

  • Maak seker by jou ma dat jy nie gevaarlike stowwe soos ammoniak of bleikmiddel saambring nie.
  • Verdeel in groepe en maak ‘n lys van die stowwe wat julle in die groep het.
  • Vra jou onderwyser om julle te help om seker te maak dat al die stowwe veilig is om aan te proe.

Voltooi die volgende tabel deur aan al die stowwe te proe en jou waarnemings neer te skryf.

SUREHierdie stowwe proe suur NEUTRAALHierdie stowwe proe nie suur of bitter nie BASISSEHierdie stowwe proe bitter
______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________
______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________
______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________
______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________
______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________ ______________________________________________________________________________________________________________

(15)

Vergelyk nou jou persoonlike ondervinding met dié van die ander lede in jou groep. Klassifiseer die stowwe in jul groep volgens smaak. Vergelyk dit met die ander groepe.

  • Het almal saamgestem oor die smake van al die stowwe? __________________
  • Indien nie, oor watter stowwe was daar verskil?

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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.

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

Assesseringstandaard 2.2: Dit is duidelik wanneer die leerder inligting kan kategoriseer: vergelyk kenmerke van verskillende kategorieë voorwerpe, organismes en gebeurtenisse.

Questions & Answers

can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
yes
Asali
I'm not good at math so would you help me
Samantha
what is the problem that i will help you to self with?
Asali
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele 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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