1. Which of the following is an example of a chemical reaction? * O A. mixing lemonade powder with water
O B. burning marshmallows over a fire
O C. melting butter in a pan
D. boiling water on a stove

How many atoms are in 1.4 mil of phosphorus trifluoride (pf3)

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

What relationship exists between an enzyme and a catalyst?