Chemistry, 04.05.2021 02:20 wendymtz2004
Rezolvati urmatoarele exercitii si probleme:
1. Alege varianta corectă: concentrația unei soluții (c =
md
ms
∙ 100), obținute prin dizolvarea a 40
g sare în 360 g apa este: a) 20 %,
b) 18 %,
c) 10 %.
2. Se amestecă 500 g soluție de saramură 20% cu 300 g soluție de saramură 50% și cu 200 g apă.
Să se calculeze concentrația soluției finale.
3. Alege, folosindu-te de SP, metalele si nemetalele din sirul de elemente: Hg, Cl, B, Ca, Na, Fe,
As, Fr, O, Mg
4. Aflati elementul chimic, stiind ca se afla in gr. IVA si perioada 3.
Answers: 1
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Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?
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Chemistry, 22.06.2019 12:20
The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397
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Chemistry, 23.06.2019 02:10
Detrimental the length of the object shown 1. 97.8mm 2. 97.80 mm 3. 97mm 4. 98mm
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Rezolvati urmatoarele exercitii si probleme:
1. Alege varianta corectă: concentrația unei soluții...
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