Which of the following is the correct formula to calculate percent by mass? (5 points) O [Mass of solution (g) = mass of solute (9)] x 100
O [Mass of solute (9) = mass of solution (9)] < 100
[Mass of solute (g) - mass of solution (9)] x 100
O [Mass of solution (g) + mass of solute (9)] x 100

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

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?

Describe the forces both attractive and repulsive that occur as two atoms move closer together.