The decay behavior of a radioactive substance obeys first order kinetics: In (N/N,) = -kt, where N is the amount of radioactive nuclei at time = t seconds, N, is the amount at O seconds, k is the first order rate constant, and t is the elapsed time. If the half-life of the radioactive nuclei is 10 minutes, calculate the amount that remains after 75 seconds. (Hint: at the first half-life, N = ½ N.) You should express your result as a percentage.

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.