Aluminum is an element. Which best describes what makes up a sample of aluminum?
minum?
one kind of atom
O two different kinds of atoms
all carbon-based atoms
a carbon atom and non-carbon atoms

State one important difference between a physical change and a chemical change?

Why is the bottom layer of a trophic pyrimid the

Astudent uses universal ph paper to find the ph of three solutions . solution a has a ph of 5 solution b has a ph of 11 and solution c has a ph of 7 identify which solution is acidic which solution is neutral and which solution is basic