Pure carbon commonly occurs in two forms: strong diamonds and soft, brittle graphite. the graphite is much more brittle because it’s carbon atoms are held together by single bonds, compared to double bonds in diamonds
true or false

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a 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.

Which is an example of a highly unstable isotope that is often used in fission reactions?