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NW Graad 9 > Natuurwetenskap Voorbereiding > Flashcards

Natuurwetenskap Voorbereiding Flashcards

(32 cards)

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1
Q

Watter drie strukture is slegs in plantselle?

A

Selwand, groot sentrale vakuool, chloroplaste

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2
Q

Wat is die funksie van die selkern?

A

Beheer selaktiwiteite; bevat genetiese materiaal

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3
Q

Wat doen die selmembraan?

A

Beheer wat in en uit die sel beweeg

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4
Q

Waar vind chemiese reaksies in die sel plaas?

A

In die sitoplasma

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5
Q

Wat doen chloroplaste?

A

Bevat chlorofil; fotosintese vind daar plaas

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6
Q

Noem die hoofdele van die manlike voortplantingstelsel.

A

Testes, epididimis, spermkanaal, penis

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7
Q

Noem die hoofdele van die vroulike voortplantingstelsel.

A

Ovarium, fallopiese buis, baarmoeder, vagina

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8
Q

Wat is ovulasie?

A

Die vrystelling van ‘n eier vanaf die ovarium

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9
Q

Wat is bevrugting?

A

Samesmelting van spermsel en eiersel

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10
Q

Wat is menstruasie?

A

Die afbreek van die baarmoederwand as geen bevrugting plaasvind nie

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11
Q

Wat is inplanting?

A

Wanneer die bevrugte eier aan die baarmoederwand heg

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12
Q

Wat is SOS’e?

A

Seksueel oordraagbare siektes (bv. MIV, gonorree, herpes)

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13
Q

Hoe kan SOS’e voorkom word?

A

Gebruik van kondome, monogame verhoudings, seksuele opvoeding

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14
Q

Wat is ‘n groep op die periodieke tabel?

A

‘n Vertikale kolom; elemente met soortgelyke eienskappe

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15
Q

Wat is ‘n periode op die periodieke tabel?

A

‘n Horisontale ry; atoomgetalle neem toe

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16
Q

Wat is die 3 sub-atoomdeeltjies?

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A

Protone, neutrone, elektrone

17
Q

Waar is protone en neutrone geleë?

Study These Flashcards
A

In die atoomkern

18
Q

Waar is elektrone geleë?

Study These Flashcards
A

In energievlakke (doppies) om die kern

19
Q

Wat is die produk van magnesium + suurstof?

Study These Flashcards
A

Magnesiumoksied (2Mg + O₂ → 2MgO)

20
Q

Wat is die produk van koper + suurstof?

Study These Flashcards
A

Koperooroksied (2Cu + O₂ → 2CuO)

21
Q

Wat is roes?

Study These Flashcards
A

Ysteroksied; vorm wanneer yster, suurstof en water reageer

22
Q

Hoe kan roes voorkom word?

Study These Flashcards
A

Verf, galvanisering (sinkbedekking), olie

23
Q

Wat gebeur as swawel + suurstof reageer?

Study These Flashcards
A

Swaeldioksied (S + O₂ → SO₂)

24
Q

Wat is die produk van koolstof + suurstof?

Study These Flashcards
A

Koolstofdioksied (C + O₂ → CO₂)

25
Wat is die algemene vergelyking vir ‘n suur + basis?
Suur + basis → sout + water
26
Wat is die algemene vergelyking vir ‘n suur + metaalkarbonaat?
Suur + metaalkarbonaat → sout + water + koolstofdioksied
27
Watter pH-waardes is suur?
0 tot 6
28
Wat is die pH van ‘n neutrale stof?
pH = 7
29
Wat is die pH-reeks van basisse?
8 tot 14
30
Wat wys ‘n universele indikator?
Presiese pH-waarde deur verskillende kleure
31
Wat doen blou lakmoes in ‘n suur?
Verander na rooi
32
Wat doen rooi lakmoes in ‘n basis?
Verander na blou

NW Graad 9 (6 decks)

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