12. How many grams of oxygen gas is required to generate 102 grams of aluminum onide?

This drawing shows a human body system. what is the primary function of this body system?

Define dew point. i am writing this part to be able to ask the question

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?