Hurry how did kelper describe the planets orbits ?

State the formula for density in words and mathematical symbols

Explain what happens at the saturation point when adding salt to water at room temperature.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?