Chemistry homework help!?
In stars, helium burning requires much higher temperatures than hydrogen burning. Can
you explain the reason? To make life easier, break the problem to comparing combining
two hydrogen nuclei with combining two helium nuclei.
Please note that this is a more or less an advanced question, and you are expected to
provide an advanced answer
:D thanks
Answer:
Due to a helium nucleus has two protons, so it has twice as much positive charge as a single proton (hydrogen has only 1 proton). Therefore, two helium nuclei repel each other, by the electromagnetic force, 4 times stronger than two protons (repulsion between 2 hydrogen nucleus). This means that two helium nuclei have a much higher Coulomb barrier to overcome in order to combine than two hydrogen nuclei. So helium burning requires a much higher temperature than hydrogen burning, since the helium nuclei must be going much faster to have the energy to get over the Coulomb barrier.
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you explain the reason? To make life easier, break the problem to comparing combining
two hydrogen nuclei with combining two helium nuclei.
Please note that this is a more or less an advanced question, and you are expected to
provide an advanced answer
:D thanks
Answer:
Due to a helium nucleus has two protons, so it has twice as much positive charge as a single proton (hydrogen has only 1 proton). Therefore, two helium nuclei repel each other, by the electromagnetic force, 4 times stronger than two protons (repulsion between 2 hydrogen nucleus). This means that two helium nuclei have a much higher Coulomb barrier to overcome in order to combine than two hydrogen nuclei. So helium burning requires a much higher temperature than hydrogen burning, since the helium nuclei must be going much faster to have the energy to get over the Coulomb barrier.
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