How many kJ are required to heat 45.0 g of H20 at 25.0 degrees celsius and then boil it all away? (specific heat of liquid water is 4.18 J/g degrees celsius)

How many miles of water are produced if 5.43 mol pbo2 are consumed

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains