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Natuurwetenskappe

Materie, meting en reaksies

Materie en meting

Opvoeder afdeling

Memorandum

  • Die houtblokkie het die grootste massa.

1. Digtheid = massa per volume Dus (a) = 1,6 g/cm 3 (b) = 2,5 g/cm 3

(c) 8,7 g/cm 3 (d) = 7,7 g/cm 3 (e) 0,8 g/cm 3

2. Gebruik twee vloeistowwe wat nie meng nie. Gooi hulle in ‘n glasbeker. Die vloeistof met die laagste digtheid sal op die ander vloeistof dryf, bv. olie op water.

Leerder afdeling

Inhoud

Aktiwiteit: om die begrip digtheid te kan beskryf en te kan toepas [lu 1.1, lu 2.4]

Gooi ‘n 50c-muntstuk en ‘n houtblokkie in ‘n glasbak halfvol met water. Die muntstuk sink en die houtblokkie dryf.

  • Watter een het die grootste massa?

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Die blokkie weeg swaarder as die muntstuk, maar dryf omdat dit ‘n kleiner digtheid het. Wanneer ons die massa en volume van ‘n stof kombineer, werk ons met die digtheid van ‘n stof.

Die onderstaande vyf ewe groot blokkies is van verskillende stowwe gemaak. Elkeen het ‘n volume van presies 10 kubieke sentimeter (10 cm3). Die benaderde massa van elkeen word aangetoon.

Ons kan die massas van die vyf stowwe vergelyk omdat hulle almal dieselfde volume het. Die massa in gram van 1 cm з van ‘n stof word sy digtheid genoem.

1. Skryf nou die digtheid van elk van die blokkies neer.

(a) __________________________________________________________________

(b) __________________________________________________________________

(c) __________________________________________________________________

(d) __________________________________________________________________

(e) __________________________________________________________________

2. Beskryf hoe jy met ‘n glasbeker en twee vloeistowwe sal illustreer dat die digtheid van vloeistowwe ook verskil. (Wenk: besluit eers watter twee vloeistowwe jy sal gebruik).

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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 1.1: Dit is duidelik wanneer die leerder ondersoeke beplan: beplan eenvoudige toetse en vergelykings en bedink hoe om dit deeglik uit te voer.

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

Assesseringstandaard 2.4: Dit is duidelik wanneer die leerder kennis toepas: pas konseptuele kennis toe deur ‘n begrip wat onderrig is met ‘n variasie van ‘n soortgelyke situasie in verband te bring.

Questions & Answers

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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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 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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