operation and report the answer to the correct number of significant figures, chemistry homework help

hey it is only short answer Please do not copy from the internet thank you

1.Perform this operation and report the answer to the correct number of significant figures:What is the mass of a cube of aluminum that is 4.0 cm on each edge?The density of aluminum is 2.7 g/cm³.Show all calculations leading to an answer.

Question .2 .Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. Use 3 – 4 sentences in your explanation.

Question.3.Why are the atomic masses of elements usually decimal numbers? Provide an answer using 3 – 4 sentences in your own words.

Question.4.In 3 – 4 sentences and in your own words describe how Mendeleev’s periodic table differs from Moseley’s.

Question.5.Why is the first ionization energy of a nonmetal much higher than that of an alkali metal in its same period? Provide an answer using 3 – 4 sentences in your own words.

Question.6.why do compounds with strong intermolecular attractive forces have higher boiling points than compounds with weak intermolecular attractive forces? Provide an answer using 3 – 4 sentences and in your own words.