CME260 F2018 Assignment1(3).pdf Home Tools CME260 F2018_... x Sign In Q1. (4 mar
ID: 716380 • Letter: C
Question
CME260 F2018 Assignment1(3).pdf Home Tools CME260 F2018_... x Sign In Q1. (4 marks total) The tesseract was a crystalline cube which formally held the space stone within the Marvel Comic Universe (a) If the tesseract measures 10 cm x 10 cm x 10 cm and is made up of entirely carbon, determine the number of carbon atoms in the tesseract. Assume the carbon in the tesseract has the same density as diamond carbon. (2 marks) (b) Natural carbon is approximately 98.9% C12, with the remainder being of the C13 isotope. If the tesseract is found to actually weigh 3.6 kg, detenine the fraction of C13 from which the tesseract is constructed. You may assume that the tesseract contains the number of atoms calculated in (a) 2 marks Q2. (8 marks total) Types of atomic bonding. Describe both which type(s) of bonding are present in the following materials and how that type of bonding affects the properties of that material. Consider the electronegativity differences between elements where applicable to justify your comments (a) H20 in its liquid form. Why does water expand when it freezes? (2 marks) (b) Mercury. Comment on the strength of interatomic bonding in mercury (Hint: why is it a liquid at room temperature)? (2 marks) (c) Polystyrene (2 marks) (d) Copper oxide (CuO) (2 marks)Explanation / Answer
1.a)Diamond has a crystal structure of FCC where in the Carbon atoms are present on each of the corners and alternate tetrahedral voids. So the corner atoms contribute 1/8×8=1 + 4 atoms in total. Assuming the similarity between diamond and tesseract as given in the question; one tesseract has 5 atoms of carbon in total.