7. Radon-222 has a half-life of 3.8 days. Starting with 50 g of radon-222, how much would be left after 19 days? Show your Work.

Asolution is made by dissolving 25.5 grams of glucose (c6h12o6) in 398 grams of water. what is the freezing point depression of the solvent if the freezing point constant is -1.86 °c/m? show all of the work needed to solve this problem.

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.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as