How would you test your gold jewelry to determine whether it is a pure compound or a mixture?

Calculate the density of the ring by dividing the mass in grams by the volume in milliliters. Compare this number to the standard density of gold, which is 19.32 grams per milliliter. If your calculated density is very close to the standard density, you can be confident that your ring is pure gold.

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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.

i think? ?

since electrons are negative the answer is neagtaive