
Vanduo ir tirpalai
Authored by Rasa Kucinskiene
Chemistry
1st Grade
10 Questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Kuris teiginys apie vandenį parašytas neteisingai?
Vanduo užverda įšildytas iki 100 laipsnių temperatūros
Vanduo užverda įšildytas iki 80 laipsnių temperatūros
Šaldamas vanduo traukiasi
Šaldamas vanduo plečiasi
Šildomas vanduo plečiasi
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Kokie ryšiai pavaizduoti paveiksle 1 nr.?
Kovalentiniai poliniai
Kovalentiniai nepoliniai
Joniniai
Vandeniliniai
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Raudonosios jūros druskingumas yra 4,1 proc. Kiek gramų įvairių druskų gautume išgarinę 1 kg jūros vandens?
4,2
7,4
74
41
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Kuri lygtis užrašyta teisingai ir rodo natrio chlorido disociaciją į jonus?
NaCl2 (aq) → Na+ (aq) + 2Cl- (aq)
Na2Cl → 2Na+ + Cl-
NaCl (aq) → Na+ (aq) + Cl- (aq)
NaCl → Na + Cl
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Raskite vario sulfato (CuSO4) masę 2,5 l tirpalo, kurio koncentracija 0,18 mol/l.
72 g
72
36
45 g
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Negyvoje jūroje yra apie 32 procentai ištirpusių druskų.
Naudodamasis lentele (vadovėlio 53 psl.), apskaičiuok, kiek gramų druskų yra ištirpusių 1 dm3.
32 g
3,2 g
320 g
170 g
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Remiantis lentele (vadovėlio 53 psl.), kokių druskų yra daugiausia?
kalio bromido
kalcio chlorido
magnio bromido
magnio chlorido
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