Which one has only 1 type of atom? compound element mixture solution

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

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro