Skip to content Skip to navigation Skip to collection information

OpenStax-CNX

You are here: Home » Content » Natuurwetenskappe Graad 7 » Om die volume van vloeistowwe te kan meet

Navigation

Table of Contents

Lenses

What is a lens?

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

This content is ...

In these lenses

  • GETSenPhaseNS display tagshide tags

    This module and collection are included inLens: Siyavula: Natural Sciences (Gr. 7-9)
    By: Siyavula

    Module Review Status: In Review
    Collection Review Status: In Review

    Click the "GETSenPhaseNS" link to see all content selected in this lens.

    Click the tag icon tag icon to display tags associated with this content.

Recently Viewed

This feature requires Javascript to be enabled.

Tags

(What is a tag?)

These tags come from the endorsement, affiliation, and other lenses that include this content.
 

Om die volume van vloeistowwe te kan meet

Module by: Siyavula Uploaders. E-mail the author

NATUURWETENSKAPPE

Materie, Meting en Reaksies

Materie en Meting

OPVOEDER AFDELING

Memorandum

1. Antwoorde mag verskil van individu tot individu:

Tabel 1
HOUER GESKATTE VOLUME KORREKTE VOLUME
Koffiebeker 250 mℓ 270 mℓ
Ketel 1 liter 1,704 liter
Teepot 400 mℓ 592 mℓ
  • Meniskus: Dit is die buiging van die oppervlak van ‘n vloeistof omdat die vloeistof aan die kante van die houer vaskleef en dan ‘n omgekeerde bogie vorm.

Opdrag 7:

Jy suig die vloeistof op en druk jou vinger so vinnig as moontlik op die boonste punt. Dan lig jy jou vinger op en laat loop die water uit totdat die meniskus gelyk met die lyn is. Jy gebruik dit wanneer jy presies 25 mℓ of 50 mℓ (of enige grootte van die pipet) wil afmeet om by iets te voeg.

  • Buret: die lesings sal afhang van die groottes van die lepels.

LEERDER AFDELING

Inhoud

AKTIWITEIT: Om die volume van vloeistowwe te kan meet [LU 1.1, LU 2.3]

Meting met ‘n maatsilinder

Volume verwys na die inhoud van sekere ruimtes. As jy koeldrank koop, betaal jy vir 'n sekere hoeveelheid vloeistof wat 'n sekere ruimte vul.

Hierdie hoeveelheid koeldrank kan ook as die volume koeldrank beskou word.

Volumes kan met 'n maatsilinder, 'n buret of 'n pipet gemeet word.

Voordat ons leer hoe om hierdie meetinstrumente te gebruik, is dit nodig om weer na parallaksfoute wat moontlik begaan kan word (en liefs vermy moet word!) te kyk.

Figuur 1
Figuur 1 (graphics1.png)

Deur dikwels 'n maatsilinder te gebruik, ontwikkel jy die vaardigheid om akkuraat te skat.

1. Gebruik 'n tipiese maatsilinder om die volumes van die volgende houers te meet (en om te kyk hoe akkuraat jy skat):

Tabel 2
Houer Geskatte volume Korrekte volume
Koffiebeker __________________ __________________
Ketel __________________ __________________
Teepot __________________ __________________

Daar is twee basiese reëls wat nagekom moet word om 'n maatsilinder korrek af te lees:

  • Jou oog moet regoor die onderkant van die vloeistofoppervlak (meniskus) wees;
  • Die maatsilinder moet nie skuins staan soos in die volgende geval nie!

Beskryf in jou eie woorde wat 'n meniskus is:

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Meting met 'n pipet

Gebruik die volgende sketse om die werking van 'n pipet beter te leer ken:

Figuur 2
Figuur 2 (graphics2.png)

OPDRAG 7

  • Verduidelik in jou eie woorde hoe 'n pipet werk:

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Meting met 'n buret:

'n Buret word gebruik om vloeistof se volume te meet.

Dit is veral geskik vir die meting van volumes kleiner as 50 cm.

Burette is van bo tot onder gekalibreer (ingedeel) en is gewoonlik akkurater as maatsilinders.

Die hoeveelheid vloeistof wat uit die buret getap word, kan bloot op die buret afgelees word deur te kyk waar die meniskus is.

Bestudeer die skets aandagtig om die werking van 'n buret met jou maat te kan bespreek:

Figuur 3
Figuur 3 (graphics3.png)

Gebruik nou 'n buret om die volumes van die volgende te meet:

Tabel 3
Voorwerp Geskatte volume Korrekte volume
Teelepel __________________ __________________
Soplepel __________________ __________________
Eetlepel __________________ __________________
Skeplepel __________________ __________________

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 2.3: Dit is duidelik wanneer die leerder inligting interpreteer: identifiseer kernidees in die teks, vind patrone in aangetekende data en maak gevolgtrekkings uit inligting in verskeie vorme (prente, diagramme, ens.).

Collection Navigation

Content actions

Download:

Collection as:

PDF | EPUB (?)

What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

Downloading to a reading device

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

| More downloads ...

Module as:

PDF | More downloads ...

Add:

Collection to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks

Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks