Ionization changes identity of substance?

Two liquids are shaken together in a test tube to produce a mixture that quickly separates into two layers. which of the following best describes the behavior of the above pair of substances? soluble insoluble miscible immiscible

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter