Explain why is it better to use images on hazard labels, rather than words

How would you reduce the volume of 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.

What are fossils of organisms that existed over a wide area but only for a limited time period called?