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Samenvatting Antwoorden 1.3 Chemische reacties 4 HAVO chemie overal scheikunde
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Antwoorden 1.3 Chemische reacties 4 HAVO chemie overal scheikunde
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1.3 Chemische reactiesEtr
I Beginstoffen verdwijnen en reactieproducten,rntstaan.
2 Massa blijft behouden.
3 Stoffen reageren in vaste massaverhouding.
4 De reactie vindt plaats bij de minimale temperatuur, de reactietemperatuur.
5 Elke reactie heeft een energie,effect.
EE
De reactietemperatuur is de minimale temperatuur waarbij een reactie plaatsvindt.
m
a Je ziet vlammen, de temperatuur is dus zeer hoog.
b De massa van de beginstoffen is gelijk aan de massa van de reactieproducten. Dat is de
wet van massabehoud,
c De massa CrH, = 3 x 12,01 + 8 x 1,008 = 44,09 u.
De massa Oz= 2 x 16,00 = 32,00 u.
De massa C}r= 12,91+ 2 x 16,00 = 44,0! u.
De massa HrO = 2 x 1,008 + 16,00 = 18,02 u.
d De vaste massaverhouding waarin propaan en zuurstof reageren tot koolstofdioxide
en water is:
44,09:5 x 32,00 : 3 x 44,01 :4 x 1,8,02 =44,09: 160,00 : 132,03 :72,0g.
EE
Ja, er is een chemische reactie opgetreden. De stof die bij 335 "C vast wordt, heeft andere
stofeigenschappen dan de stof waarmee je bent begonnen. Die stof stolt en smelt bij
440'c. Er is dus een stofeigenschap veranderd, namerijk het smeltpunt = stolpunt.
exotherm en endotherm
@ Noordhoff U¡tgevers bv
Scheiden en reageren I Z
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