An empty Erlenmeyer flask weighs 257.1 g. When filled with water (d = 1.00 g/cm3), the flask and its contents weigh 552.9 g. (a) What is the volume of water in the flask? Enter your answer in scientific notation. (b) How much does the flask weigh when filled with the same volume of chloroform (d = 1.48 g/cm3)?

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.