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
Chemistry, 21.06.2019 18:00
Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.
Answers: 3
Chemistry, 21.06.2019 23:00
Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?
Answers: 1
Chemistry, 22.06.2019 03:30
What is the relationship of air masses and the temperature of oceans?
Answers: 1
Chemistry, 22.06.2019 04:00
Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?
Answers: 1
Rezolvati urmatoarele exercitii si probleme:
1. Alege varianta corectă: concentrația unei soluții...
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