Balanced equation for combustion of butanoic acid

Compare and contrast physical changes with chemical changes.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!