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Natuurwetenskappe

Graad 8

Materie: klassifikasie

Module 21

Verbindings en mengsels

VOORKENNIS

  • In die vorige deel van die werk het ons verduidelik wat ‘n element is en dat dit uit atome bestaan.
  • Ons het genoem dat atome nie geïsoleerd voorkom nie, maar verbind tot molekule.

Klasaktiwiteit: praktiese ondersoek

Ondersoek na fisiese eienskappe van elemente

Jou onderwyser sal hulp verleen in jou ondersoek na die individuele elemente yster en swawel se fisiese eienskappe en die veranderinge wat dit ondergaan wanneer dit verbind.

1. Hoe lyk die yster?

2. Hoe lyk die swawel?

3. Word die yster deur die magneet aangetrek?

4. Word die swawel deur die magneet aangetrek?

5. Wat kan jy hieruit aflei?

6. Voeg ‘n bietjie koolstofbisulfied (CS 2 ) by die yster.

Wat gebeur?

7. Voeg ‘n bietjie koolstofbisulfied (CS 2 ) by die swawel.

Wat gebeur?

8. Wat kan jy hieruit aflei?

Gooi die inhoud van die proefbuise nou uit in twee horlosieglaseen laat dit indamp.

9. Wat is sigbaar nadat die koolstofbisulfied verdamp het?

Ondersoek na fisiese eienskappe van mengsels

Voeg nou ystervylsels en swawel saam.

1. Hoe lyk die mengsel?

2. Wat gebeur, indien jy nou die magneet nader bring?

3. Wat kan jy hieruit aflei?

4. Voeg nou CS 2 by die mengsel. Wat gebeur?

5. Kan jy dus die mengsel skei?

6. Stel twee maniere van skeiding voor

Klasaktiwiteit (vervolg): demonstrasie

1. Wat gebeur as die yster en die swawel saam verhit word?

2. Het ‘n nuwe stof gevorm? Hoekom sê jy so?

3. Het die stof nog magnetiese eienskappe?

4. Is die stof oplosbaar in koolstofbisulfied?

5. Kan jy die stof weer terugskakel na die oorspronklike elemente?

6. Wat was nodig vir die reaksie om plaas te vind?

7. Watter energie-omsetting het plaasgevind?

8. Voltooi die volgende tabel van vergelyking:

MENGSELS VERBINDINGS
‘n Onsuiwer stof ‘n ......................................................... stof
Samestelling wissel Samestelling ......................................................
Geen energie betrokke by vorming Energie ..............................................................
Eienskappe van individuele stowwe word behou ............................................... eienskappe vorm
Kan geskei word met fisiese metodes, bv. magneet Kan slegs ...................................... geskei word

Assessering van eksperiment

Kon jy die stappe beplan (AS 1.1), uitvoer (AS 1.2) en jou bevindinge kommunikeer (AS 1.3)?

[LU 1.1; 1.2; 1.3]

Assessering

LU 1

Wetenskaplike Ondersoek

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.

Dit is bewys as die leerder:

1.1 ondersoeke kan beplan;

1.2 ondersoeke kan uitvoer en data kan insamel;

1.3 data kan evalueer en bevindinge kan kummunikeer.

Memorandum

Verbindings en mengsels

KLASAKTIWITEIT: PRAKTIESE ONDERSOEK

ONDERSOEK NA FISIESE EIENSKAPPE VAN ELEMENTE

1. grys hard

2. geel poeier

3. ja

4. nee

5. metale is magneties

6. niks

7. swawel los op

8. metale onoplosbaar in koolstofbisulfied

9. kristalle – swawel

ONDERSOEK NA FISIESE EIENSKAPPE VAN MENGSELS

1. grys-geel

2. slegs ystervysels aangetrek

3. slegs metaal magneties

4. slegs swawel los op

5. ja

6. los S op en damp weer in – kristalle terug of magneet

KLASAKTIWITEIT: DEMONSTRASIE

1. versmelt tot nuwe stof

2. ja – lyk anders; eie eienskappe

3. nee

4. nee

5. ja met moeite

6. hitte

7. hitte- chemies

8. Voltooi die volgende tabel van vergelyking

MENGSELS VERBINDINGS
‘n Onsuiwer stof ‘n ……suiwer…….stof
samestelling wissel samestelling vasgestel………….
Geen energie betrokke by vorming energie………….benodig
Eienskappe van individuele stowwe word behou …nuwe…….eienskappe vorm
Kan geskei word met fisiese metodes bv. magneet Kan slegs …chemies en met moeite………..geskei word

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
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
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
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 8. OpenStax CNX. Sep 12, 2009 Download for free at http://cnx.org/content/col11049/1.1
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