Which are uses of electromagnetic waves? Check all that apply. cooking foods
insulating buildings
using heat lamps
transmitting radio signals
using medical imaging
lighting rooms
cooling refrigerators

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

When a scientific theory has been tested and proved by the scientific community, it becomes a law

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.