Sandy has just made a pitcher of hot tea. she pours the tea into a cup and picks it up. the cup acts as an insulator, so sandy can pick up the cup even though the liquid inside is hot.

of what material could the cup be made?

select one:
a. wood
b. glass
c. plastic
d. all of these

Explain what happens at the saturation point when adding salt to water at room temperature.

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.

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect