Which of the following statements concerning the cubic unit cell is are CORRECT?

Question

Which of the following statements concerning the cubic unit cell is are CORRECT? For cubic unit cells, three cell symmetries occur: primitive cubic, face-centered cubic, a body centered cubic. The cell edges of a cubic unit cell are all equal in length. The corner angles of a cubic cell are 90 degree. only 2 only 3 only 2 and 3 1, 2, and 3 Which of the following is/are physical properties of amorphous solids? Amorphous solids have well defined melting points. At the particulate level, amorphous solids do not have long range order. Polymeric materials never form amorphous solids. 1 only 2 only 3 only 1 and 3 2 and 3 Which one of the following substances is incorrectly matched with the kind of solid it forms? Substance/Kind of solid sulfur dioxide/molecular graphite/covalent calcium bromide/ionic potassium/ionic methane/molecular which of the statements concerning the phase diagram is are CORRECT? Only the solid phase exists at point A. At point C, the solid and liquid phases are in equilibrium. At point D, the critical point, the substance exists as a supercritical fluid.

Explanation / Answer

6)
cubic unit cells exist as simple cubic, FCC and BCC
Here , edge length: a=b=c
and angle1 = angle2 = angle3
Answer: e

7)
They melt over a range and they dont have any order
Answer: c

8)
potassium is an element and its not a compound
Answer: d

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