A solution containing 0.750g of an unknown substance in 30.0g of cyclohexane was found to freeze at 3.1 C. What is the molar mass of the unknown substance?

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Which type of fossil does this image depict?

Why is the melting of ice a physical change ?