A generator is not required to generate electrical energy when which of the following energy sources is used?
a.) Solar
b.) Wind
c.) Hydroelectric
d.) Nuclear

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth