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

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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.

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