Graad 8 Natuurwetenskappe (NW) Opsommings Kwartaal 2: Die opsommings is saamgestel deur die Via Afrika handboek se werk op te som. Opsommings is in Afrikaans met aanvullende en skriftelike notas wat deur die opsteller saam gestel is.
Afdeling 2: Materie en materiale
Onderwerp 1: Atome
Onde...
, Mengsels van elemente en verbindings
Elemente (voortgesit)
Elemente en verbindings
Atome kan molekules van
word dikwels saam gemeng
verbindings te vorm
• Die lug is 'n mengsel van elemente (stikstof en
suurstof) en verbindings (waterdamp en • Verskillende atome kan verbind om molekules
swaeldioksied). O1: Atome te vorm - molekules van verbindings.
•
• Hierdie stowwe is mengsels - hulle is nie chemies (B)
gebind nie en hul hoeveelhede kan verskil.
• Verbindings
•
Verbindings bestaan uit atome
Verskillende metodes word gebruik
• Sample
om mengsels en verbindings te skei
Mengsels word geskei deur fisiese metodes -
handskeiding, skeiding met magnete, filtrasie
en distillasie.
Verbindings word deur chemiese
•
reaksies gevorm
Atome word nader mekaar gebring in 'n
•
van verskillende elemente
Wanneer 2 of meer verskillende atome in 'n
vaste verhouding gebind word, vorm dit
molekules van verbindings.
chemiese reaksie - die atome het gebind. • Molekules van verbindings kan in sy
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