1.6x10^23 lead atoms. find the weight in grams

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Compare and contrast physical changes with chemical changes.

Freezing 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.