Which of the following is an example of a chemical change? a. freezing water to make ice.
b. a firework exploding.
c. breaking a glass bottle.
d. melting gold jewelry to make a gold bar.

Gymnast always perform on padded mats. how does the mats protect the gymnast

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?

Draw two cyclic constitutional isomers of cis-1