Which of the following is true of the formula weights of a material which exists in both anhydrous and hydrated forms?
A) They have the same formula weight.
B) The hydrated form always has a lower formula weight.
C) The hydrated form always has a higher formula weight.
D) We cannot make any general statement about the formula weights of the two forms.
C
You might also like to view...
One of the products of combustion is water. Why doesn't this water extinguish the combustion?
A. Combustion only produces micro amounts of water. B. While areas of combustion are being extinguished, new areas are combusting. C. The chemical combustion reaction is happening too fast for the water to have an effect on the fire. D. This water is in the gaseous phase and merely floats away from the fire.
When the distance between two charges is halved, the electrical force between the charges
A) quadruples. B) doubles. C) halves. D) is reduced by one-quarter. E) none of the above
Assume that a particular radioactive-isotope dating method has a half-life of 150 million years. Also assume that the parent isotope is commonly incorporated in igneous-rock minerals but that the daughter isotope is not
Measurements show that one crystal in an igneous rock contains 5 million atoms of the parent isotope and 75 million atoms of the daughter isotope. How old is this crystal? What will be an ideal response?
Which of the following is not involved in regulating control at the transcriptional level?
A) enhancers B) promoters C) response elements D) tRNAs