Which of these statements describes the size of an atom?
a. an atom is larger than a sheet of aluminum foil.
b. an atom is small but can be seen with just our eyes.
c. an atom is the size of a plastic building block.
d. an atom is tiny and cannot be seen without magnification.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion