1. Home
  2. Natuurwetenskappe graad 5
  3. Kwartaal 3
  4. Die eienskappe van materiale

3.3 Die eienskappe van materiale

<< Chapter < Page
  Natuurwetenskappe graad 5     Page 1 / 2
Chapter >> Page >

Natuurwetenskappe

Graad 5

Materiaal

Module 29

Eienskappe van materiale

Aktiwiteit:

Om die eienskappe van sekere materiale te ondersoek

[lu 1.1.3; 1.2; 1.3]

1. Polimere

‘n Mens kry natuurlike en mensgemaakte polimere. Proteïne, wat ‘n belangrike boustof in lewende organismes is, is ‘n voorbeeld van ‘n natuurlike polimeer. Sintetiese polimere is eers omtrent ‘n 100 jaar gelede ontdek. Toe was dit baie skaars en duur. Sintetiese polimere kan in twee groepe verdeel word, naamlik vesels en plastiek. Ons gaan hoofsaaklik kyk na plastiek.

Sintetiese Polimere: Plastiek

Plastiek kan helder of kleurvol wees en kan in enige fatsoen gevorm word.

Hoe word plastiek gemaak?

Olie kom diep onder die grond in sekere areas voor. Daar word diep in die grond af geboor om die olie na die oppervlak te bring. Hierdie olie is dik en swart en word ru-olie genoem.

Kyk na die onderstaande kaart en identifiseer die lande waar olie gevind word. Jy mag in ‘n groep werk.

Eksperiment:

Van olie tot plastiek

Kom ons doen ‘n eenvoudige eksperiment om te kyk deur watter proses ru-olie min of meer gaan in die vervaardiging van plastiek:

  • Verhit botter
  • Botter smelt
  • Botter verdeel in twee dele: een deel lig en wit, die ander deel swaar en geel

Wanneer ru-olie verhit word, gebeur min of meer dieselfde. Die ru-olie word na ‘n raffinadery geneem waar dit teen ‘n baie hoë temperatuur verhit word. Die olie verdeel in ligter en donkerder olie. Die ligte olie word gebruik om onder andere plastiek van te maak.

Gebruik van plastiek

Sekere plastiek is hard en word gebruik om tafels en stoele van te maak. Dit word ook toenemend gebruik om motoronderdele te vervaardig wat vroeër van staal gemaak is. Plastiek kan heelwat harder as staal wees.

Ander plastiek is sag en buigbaar. Hierdie plastiek word gebruik om goed soos inkopiesakkies, stortgordyne en reënjasse van te maak.

Plastiek word gebruik om houers vir die stoor van voedsel te maak. Baie produkte op die rakke in supermarkte word in plastiekhouers verpak.

Noem ‘n paar sulke produkte:

Watter rol speel plastiek in behuising?

In informele nedersettings vorm plastiek ook ‘n noodsaaklike deel in die oprigting van ‘n plakkershut. Het jy al waargeneem hoe plastiek benut word en waarom plastiek so ‘n belangrike rol speel? Sê hoe plastiek so ‘n huis teen die wisselende weersomstandighede kan beskerm.

Hoe word plastiek herwin en hoe word die plastiek weer in gebruik geneem? Soek inligting en gee skriftelike terugvoering:

Onthou: Plastiek kan en behoort herwin te word!

I nteressante feite:

Plastiek kan tien keer harder as staal wees en kan hoë temperature weerstaan.

Kredietkaarte word van plastiek gemaak; dit word in die plek van kontantgeld gebruik.

Chirurge gebruik plastiek om allerhande liggaamsdele te vervang, bv. hartkleppe, are, ens.

V oordele van plastiek:

Die gebruike van plastiek het baie werkgeleenthede vir mense in ons land geskep.

Die natuur kan nie genoeg katoen, wol, hout, ens. aan die mense verskaf nie. Dus moet ons van ander materiale soos plastiek gebruik maak.

N adele van plastiek:

Questions & Answers

what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
Wekolamo Reply
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Manix Reply
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
namakula Reply
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
Zyryn Reply
good👍
Jonathan
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
generally amnesi how long yrs memory loss
Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
Heidi Reply
treat them normal, if they want help then give them. that will make everyone happy
Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
continue.. sometimes due to these physical problems..the diagnosis may be misdiagnosed. treatment for autism. well it depends on the severity. since autistic kids have problems in communicating and adopting to the environment.. it's best to expose the child in situations where the child
Jharna
child interact with other kids under doc supervision. play therapy. speech therapy. Engaging in different activities that activate most parts of the brain.. like drawing..painting. matching color board game. string and beads game. the more you interact with the child the more effective
Jharna
results you'll get.. please consult a therapist to know what suits best on your child. and last as a parent. I know sometimes it's overwhelming to guide a special kid. but trust the process and be strong and patient as a parent.
Jharna
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply
<< Chapter < Page Page > Chapter >>

Read also:

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10980/1.2
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 5' conversation and receive update notifications?

Ask