The correct answer to the following questions are these:
1. Displacement occurs when they is an obvious difference in reactivity for both your metals. If you got Rubidium and Sodium, obviously rubidium got the better reactivity, hence it will displace any sodium compound in any reaction unless u got something more reactive than rubidium.
2. A molecule or compound is made when two or more atoms form a chemical bond, linking them together. The two types of bonds are ionic bonds and covalent bonds. In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons. If the electron is shared equally between the atoms forming a covalent bond, then the bond is said to be nonpolar. Usually, an electron is more attracted to one atom than to another, forming a polar covalent bond. For example, the atoms in water, H2O, are held together by polar covalent bonds.
3. 54.291
