rust results from iron’s reaction to oxygen. an iron nail gains mass when it rusts. how does this reaction support the law of conservation of mass?

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?

Which of the following is true about the speed of light? it depends on the wavelength.

Malia was able to make a paper clip float on the surface of water what will most likely happen to the paper clip if a drop of dishwashing detergent is added near it