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everything maths and science - C2B2A

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Oefening 13 – 9:<br />

1. a) Redoksreaksie<br />

b) Brønsted-Lowry basis<br />

c) Oksidasie<br />

d) Amfoteriese stof<br />

2. HNO3 skenk protone en is ’n<br />

Brønsted-Lowry suur<br />

3. Br − is die oksideermiddel(chloor is<br />

in hierdie reaksie gereduseer)<br />

4. H2SO3 is die Brønsted-Lowry suur<br />

en KOH is die Brønsted-Lowry<br />

basis.<br />

6. 2HCl (aq) + Mg(OH) 2 (aq) →<br />

MgCl 2(aq) + 2H2O (l)<br />

14 Die litosfeer<br />

Oefening 14 – 1: Goudontginning<br />

7. 2HCl (aq) + Na2CO3(aq) →<br />

2NaCl (aq) + H2O (l) + CO2(g)<br />

8. 2H3PO4(aq) + 3CaO (s) →<br />

Ca3(PO 4 ) 2 (aq) + 3H2O (l)<br />

10. a) i. −1<br />

ii. −2<br />

iii. 0<br />

1. b) Goud word geoksideer. d) Sink<br />

Oefening 14 – 2:<br />

1. a) Litosfeer<br />

b) Mineraalverwerking of<br />

12. c) Fe3+ + 3H2O + 3NO2 →<br />

Fe + 3NO − 3 + 6H+<br />

13. Cd (s) + 2NiO(OH) (s) +<br />

2H2O (l) → Cd(OH) 2 (s) +<br />

2Ni(OH) 2 (s) + 2OH − (aq)<br />

-ontginning<br />

c) Middel Steentydperk<br />

Oplossings<br />

511

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