A graduated cylinder contains 17.5 mL of water. A metal cube is placed in the cylinder and the water level rose to 20.3 mL. The metal cube has a mass of 30 g. What is the density of the metal cube

10.71 g/mL

Explanation:

Initial Volume = 17.5 mL

Final Volume = 20.3 mL

Volume of cube = Final Volume - Initial Volume = 20.3 mL - 17.5 mL = 2.8mL

Mass of cube = 30g

Density = Mass / Volume

Density = 30 / 2.8 = 10.71 g/mL

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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