A25.0 ml sample of an hcl solution is titrated with a 0.139 m naoh solution. the equivalence point is reached with 15.4 ml of base. the concentration of hcl is m.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.