Which of the following is true about melting point determination?
a. at the melting point of...
Which of the following is true about melting point determination?
a. at the melting point of a substance, the solid and vapor states exist in equilibrium.
b. an impure compound has a narrow, sharp melting point range.
c. a solid is said to sublime when it first liquefies and then vaporizes to a gas.
d. at the eutectic point, the melting point of a mixture of two compounds is sharp.
e. although a substance may exist in different crystalline forms, it has only one characteristic melting
point.
Answers: 1
Chemistry, 22.06.2019 02:50, giiffnlojd
Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.
Answers: 3
Chemistry, 22.06.2019 04:30, terrancebest
Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat
Answers: 2
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