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How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas

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.