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Chapter 18: Q. 7 (page 511)
What is the number density of (a) aluminium and (b) lead?
It deals with the density of lead and aluminium and the atoms bounded in the system
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1.0 mol of gold is shaped into a sphere. What is the sphere鈥檚
diameter?
Two students each build a piece of scientific equipment that uses a 655 mm-long metal rod. One student uses a brass rod, the other an invar rod. If the temperature increases by C, how much more does the brass rod expand than the invar rod?
a. Is there a highest temperature at which ice can exist? If so,
what is it? If not, why not?
b. Is there a lowest temperature at which water vapor can exist?
If so, what is it? If not, why not?
The lowest and highest natural temperatures ever recorded on earth are -129掳F in Antarctica and 134掳F in Death Valley. What are these temperatures in 掳C and in K?
The atomic mass number of copper is A = 64. Assume that atoms in solid copper form a cubic crystal lattice. To envision this, imagine that you place atoms at the centers of tiny sugar cubes, then stack the little sugar cubes to form a big cube. If you dissolve the sugar, the atoms left behind are in a cubic crystal lattice. What is the smallest distance between two copper atoms?
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