Atoms, Molecules, and Compounds Atoms combine into molecules.
O is an atom: O, is a molecule: both are oxygen.
Molecules are made up of two or more atoms.
Water molecule
a compound (H2O)
Oxygen molecule
an element (0)
2 hydrogens
If two different atoms combine they make compounds:
H. O is a compound; 0, is a molecule.
Compounds are made up of two or more elements.
1 oxygen
2 oxygens
Atom, molecule or compound?
What elements are these?
NaCl-
Na-
Cl-
CI-
Na
by C. Stephen Murray,

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

answer; consonant;