Robert Boyle did not believe that water was one of the basic elements that all substance was made of. To test this, he conducted an experiment where he ran an electric current through water. He placed two test tubes above each of the terminals of the electricity source and collected the gas that came out. He repeated the
experiment a total of three times, each time using the same amount of water and the same level of electric
current. These are his experimental results: what is the dependent variable in this experiment

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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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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.