In the pre-lab, you determined how to combine equations to derive the equation for the dissolution of calcium in water. note: the text boxes for the questions will expand automatically as you enter more lines of text. just because the text boxes start as a single line, does not mean you should limit your answer to one line of text. (1pts) use hess's law with your average experimental values (δhneut and δhca+acid) to calculate δhca+water, the enthalpy change for the dissolution of calcium in water.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Calculate the number of molecules present in 0.750 mol of mgo.