How was the lead chloride separated from chlorides of lead and mercury?
By adding hot water to the chlorides which dissolves only the lead chloride, if it is
present.
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Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about 3 g/cm3 . Ice or water is 1.0 g/cm3 . This implies that
a. Pluto has a large iron-nickel core. b. Pluto is about 35% water ice and 65% rocky material. c. Pluto is all rock. d. Pluto is all water or water ice.
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
a. 25.3 m b. 29.6 m c. 27.4 m d. 23.6 m e. 18.9 m
There are three types of collapsed, burned-out stars: black holes, white dwarfs, and
A) X-ray stars. B) supernova. C) neutron stars. D) quasars. E) red giants.
In a flat universe parallel lines
A) never converge. B) are concentric to each other. C) are mirror images. D) eventually meet.