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physical chemical or nuclear?
air gas mixed
latex paint dries
uranium decays to lead
a jet engine starts
a light bulb is turned on
the sun produces energy
"Air gas mixed" is a physical change because you are making a mixture, not another substance with different properties.
"Latex paint dries" is a physical change because water evaporate and changes into water vapor, not another substance.
"Uranium decays to lead" is a nuclear change, because uranium and lead have different number of neutrons in their respective nuclei.
"A jet engine starts" is a chemical change, because the fuel is ignited, combines with oxygen, and changes into carbon dioxide and water vapor.
"A light bult is turned on" is a physical change, because electrons passing through the philament generate heat due to essentially friction. No new substances are created.
"The sun produces energy" is a nuclear change, because nuclei of hydrogen are fused together to form nuclei of helium releasing a huge amount of energy in the process.
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