5-O selênio e o enxofre pertencem à família VI A da tabela periódica. Sendo assim, o seleneto e o sulfeto de hidrogênio são representados, respectivamente pelas fórmulas:

a) HSe e HS

b) H 2 Se e HS

c) HSe e H 2 S

d) H 2 Se e H 2 S

e) H 3 Se e H 3 S

Write a paragraph at least 10 sentences explaining how rocks are used today in society

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?