A certain hydrate is found to have the following percent composition by mass: 20.3% Cu, 8.95% Si, 36.3% F, and 34.5% H2O. What is the Formula of this hydrate?
CuSiF6•7H2O
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Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

Why is the bottom layer of a trophic pyrimid the