Round each of the following numerical values to four significant figures and express the result in standard scientific notation. To express a number in scientific notation, write E# or e# in place of x10# . For example, 1.23E-4 is equivalent to 1.23 × 10–4. a) 104.38100 b) 125890 c) 0.000867510 d) 80.943 × 106 e) -0.0046800

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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.