En un vaso se han puesto 250 g de alcohol junto con 2 g de yodo, que se disuelven comletamente. a: Calcula la concentración de la disolución en % masa.
b: ¿Cuántos gramos de disolución habrá que coger para que al evaporarse el alcohol queden 0,5 g de yodo sólido?
c: si tomamos 50 g de disolución y dejamos evaporar el alcohol. ¿cuántos g de yodo quedan?

1) this is the structure in the cell nucleus that houses a cell's genetic information

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.