Why is a solution not a pure substance? it is made up of two substances that are chemically combined. it is made up of one substance. it is a mixture between a solute and solvent. the solute and solvent cannot be separated.

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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.