Num dado ensaio, os alunos adicionaram 40,0 g de nitrato de potássio a 150 mL de água destilada. Selecione a opção que completa corretamente a frase seguinte.
Quando a mistura é aquecida até à temperatura de 40 oC, obtém-se uma solução..
(A) ... não saturada, sendo ainda possível dissolver 63,9 g de soluto.
(B) ... saturada.
(C) ... sobressaturada, com 55,9 g de precipitado.
(D) ... não saturada, sendo ainda possível dissolver 55,9 g de soluto.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

answerto predict;