A student wants to fry an egg in a 1.77 kg iron skillet. An egg will become firm at 70°C. If the skillet begins at room temperature of 25°C, what is the
minimum amount of energy that must be transferred to the skillet in
order to fry the egg?*

Which statement justifies that phosphine (ph3) is a polar molecule?

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.

How do you know when a chemical reaction has occurred