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8th Physical Sciences – Sample Questions Name ______________________________ Period_________ 1) Describe in detail why atoms form covalent bonds. What is the driving force behind atoms binding with other atoms? Describe why noble gasses do not bind with other atoms. Response: ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ 2) Consider the element Sodium: a) Abbreviation _________________ (2 points) b) Atomic Number _________________ (2 points) c) Atomic Weight___________________ (2 points) d) Number of Electrons _________________ (2 points) e) Using the abbreviation, show an ion of Sodium: ______________ (2 points) f) Number of Protons _________________ (2 points) g) Number of Neutrons ________________ (2 points) h) Name one property of Sodium. (2 points) ____________________________________________________ ____________________________________________________ i) Draw a Bohr model of Sodium (4 points) j) How many directions does Sodium Bond? _______________ (2 points) k) What kind of a bond does Sodium make with other atoms? __________________________________________ (2 points) 3) The density of mineral oil is .85 g/ml. The density of black ebony wood is 1.3 g/ml. The density of cooking oil is .926 g/ml. When these items are put into a beaker of water and allowed to settle, what would you expect to see? Draw a picture below. Response: 4) Water (H2O) is made of two gases, hydrogen and oxygen. Scientists want to send humans to the planet Mars, but humans need oxygen and water to survive. If Mars was found to contain underground deposits of ice, would it be possible for man to survive and why? Response: