The walls of your refrigerator must keep as much energy as possible from getting inside the refrigerator. The refrigerator will use a lot of this material, so the cost must be low. Which material would you use to make the refrigerator's inner walls?

How do you know when a chemical reaction has occurred

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.