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  4. Om materiale te klassifiseer

4.1 Om materiale te klassifiseer

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Natuurwetenskappe

Materie en stowwe

Eienskappe en gebruike van materie

Opvoeders afdeling

Memorandum

Voltooi die volgende tabel:

EIENSKAPPE VASTE STOF VLOEISTOF GAS
VOLUME Dit het nie ‘n vaste volume nie – die volume verander maklik. Dit ver-sprei en neem die spasie in wat beskikbaar is.
VORM Dit neem die vorm van die houer aan.
GEWIG Dit het gewig.

Voorbeelde van faseverandering:

  • Vaste stof na vloeistof: ys na water
  • Vloeistof na vaste stof: water na ys
  • Vloeistof na gas: water wat kook, waterdamp
  • Gas na vloeistof: waterdamp / vog wat kondenseer teen glas, bv. motor- of kombuisvensters

Leerder afdeling

Inhoud

Aktiwiteit: om materiale te klassifiseer [lu 2.2, lu 2.3]

  • Wanneer stowwe in groepe met dieselfde eienskappe verdeel word, noem ons dit klassifikasie .
  • Wetenskaplikes klassifiseer verskillende materiale op verskillende maniere. Die bekendste manier is om dit volgens vaste stowwe, vloeistowwe en gasse te klassifiseer.

Voltooi die volgende tabel:

EIENSKAPPE VASTE STOF VLOEISTOF GAS
VOLUME Dit het ‘n vaste volume. Dit het ‘n vaste volume.
VORM Dit het ‘n vaste vorm. Dit neem die vorm van die houer aan.
GEWIG Dit het gewig. Dit het gewig.

‘n Stof kan van een fase na ‘n ander verander deur verhitting of afkoeling :

Gee ‘n voorbeeld van die volgende soorte fase-veranderings:

  • Vaste stof na vloeistof:

_____________________________________________________________________

_____________________________________________________________________

  • Vloeistof na vaste stof:

_____________________________________________________________________

_____________________________________________________________________

  • Vloeistof na gas:

_____________________________________________________________________

_____________________________________________________________________

  • Gas na vloeistof:

_____________________________________________________________________

_____________________________________________________________________

Assessering

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

Assesseringstandaard 2.2: Dit is duidelik wanneer die leerder inligting kategoriseer: kategoriseer voorwerpe en organismes in terme van twee veranderlikes.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
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Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
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Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
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Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
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Micheal
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Micheal
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Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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