
Atom- og formelmasse
Authored by Bibi Ziersen
Chemistry
11th Grade
Used 2+ times

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10 questions
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1.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Atomers masse angives med atommasseenheden u. Hvad står u'et for?
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Kig i et periodisk system. Hvad er oxygens atommasse?
12,01 u
16,0 u
8,0 u
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Udregningen af chlors atommasse (35,453 u) ses her:
M(Cl) = 75,87 % 34,969 u + 24,22 % 36,966 u = 35,453 u
Hvad kan man udlede af regnestykket? Vælg alle korrekte udsagn.
At chlors masse består af 75,87 % neutroner og protoner, samt 24,22 % elektroner
At 75,87 % af verdens chlor-atomer har en atommasse på 34,969 u
At chlors gennemsnitlige atommasse er 35,453 u
At der findes to naturligt forekommende isotoper af chlor
4.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
Hvis man lægger atommassen for et Na-atom sammen med atommassen for et Cl-atom, så får man ______massen for natriumchlorid
5.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Formelmassen for et molekyle kaldes også for _______massen
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hvordan beregner man molekylmassen for dinitrogenoxid, N2O?
Man lægger atommassen af et nitrogenatom og et oxygenatom sammen
Man lægger atommassen af to nitrogenatomer og et oxygenatom sammen
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Kig i et periodisk system. Hvad bliver molekylmassen for carbondioxid (CO2) ca.?
44 u
22 u
28 u
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