How is any lead chloride in the sample removed in step 2?
Any lead chloride present is dissolved in the hot water that is poured through the
filter paper in this step and is carried away as part of the filtrate.
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Pressure: When a box rests on a round sheet of wood on the ground, it exerts an average pressure p on the wood. If the wood is replaced by a sheet that has half the diameter of the original piece, what is the new average pressure?
A. 4p
B. 2p
C. p
D. p/2
E. p/4
Carbonaceous meteorites are believed to come from:
A) coal formed on Mars, then blown into space by asteroid impacts. B) the core of a differentiated type M asteroid, now broken up. C) the crust of a differentiated C type asteroid, now broken up. D) a broken up cometary nucleus, dark like Comet Halley's nucleus. E) deep space, far beyond the solar system, hence their very low density.
A mass is oscillating on a spring with a period of 4.60 s. At t = 0 s the mass has zero speed and is at x = 8.30 cm. In any 4.60 s time interval, how much time is the mass more than 4.15 cm away from x = 0 cm?
A) 0.326 s B) 0.575 s C) 0.767 s D) 1.53 s E) 3.07 s
Your largest personal contribution to global warming in a year comes from ________
a. use of freon propellants b. use of air conditioners in your home c. driving your car d. cutting down trees e. burning natural gas for home heating.