H2 + co2 → ch2o2 reactant bond energies: h–h is 432 kj/mol, c=o is 799 kj/mol product bond energies: c–h is 413 kj/mol, c=o is 745 kj/mol, c–o is 358 kj/mol, o–h is 467 kj/mol how much energy must this system absorb before the reaction can begin?.

You want to test the hypothesis that smoking cigarettes increases the risk of lung cancer. in your experiment, you take 100 people of various ages and genders for each of your groups. one group smokes. the other group does not smoke. the group that does not smoke is called the group