What is a food chain? what does it show?

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

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?

Once similarity and one difference between a mixture of elements and a mixture of compounds