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Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?