21) Which statement best describes all compounds?
A)
They can be decomposed by chemical change.
B)
They can be decomposed by physical means.
C)
They contain at least three elements.
D)
They contain ionic bonds.

Ok where is the image ?

Olá. porque a reação na temperatura é muito rapida a do copo : )

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Answers are 1,2,4 its correct on edgenuity.