Why is atomic number the better way to organize the elements of the periodic table and not organizing by atomic mass? a. the atomic mass can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order.  also, the atomic number is unique to each element. b. the atomic number can be different for atoms of the same element, so it makes the patterns of the periodic table more varied. c..the atomic number can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order.  also, the atomic mass is unique to each element. d. the atomic number and atomic mass are equivalent, so the atomic number is used because it is a smaller number.

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains