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Exam (elaborations)

oefentoets scheikunde havo 5

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oefentoets scheikunde havo 5

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  • January 20, 2023
  • 4
  • 2022/2023
  • Exam (elaborations)
  • Answers
  • Secondary school
  • 5
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Schoolexamentoets 5 HAVO
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Scheikunde




Dimethylsulfide


Dimethylsulfide is een stof met de molecuulformule C2H6S. Deze stof heeft een
zeer onaangename geur.
Bij de verbranding van dimethylsulfide komt onder andere zwaveldioxide vrij. Dit is
een giftig gas. De grenswaarde (MAC waarde) van zwaveldioxide
bedraagt 5,0 mg m–3.

In een ruimte van 500 m3 wordt 2,0 gram dimethylsulfide verbrand.

2p Bereken het aantal mol dimethylsulfide dat wordt verbrand.

3p Geef de vergelijking voor de volledige verbranding van dimethylsulfide.

3p Laat met behulp van een berekening zien of de grenswaarde (TGG 8 uur) van
zwaveldioxide in de ruimte van 500 m3 wordt overschreden als er 2,0 gram
dimethylsulfide wordt verbrand.


Oplossingen van salpeterzuur




We hebben twee oplossingen van salpeterzuur, oplossing A en oplossing B.
Oplossing A heeft een volume van 500 mL. Hierin is 2,2 g salpeterzuur opgelost.

3p Bereken de pH van oplossing A.

De pH van oplossing B is 4,60.

3p Met welke twee pH indicatoren kunnen we zo nauwkeurig mogelijk aantonen dat
de pH van de oplossing inderdaad 4,60 is? Vermeld in je antwoord ook de kleuren
van de indicatoren.

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