science

a tiny group of two or more atoms that are bonded tightly together

Subtances that are composed of more than one type of atom bonded together are called

Some compounds are called ______ compounds because they are made of molecules. However, not all compounds are composed of individual _______,

Instead, some substances are made of geometric structures containing many trillions of atoms all bonded together. These substances are called ________ _________

The most familiar example of a nonmolecular compound is probably ordinary ______ ______, or ________ _______ (NaCl)

the atoms of sodium and chlorine are fitted together in such a way as to build a beautifully geometric structure called a ______

Because charged atoms are called ____, compounds composed of charged atoms or groups of atoms are called _______ compounds.

a network of individual carbon atoms, each lacking an electric charge

the hardest of all known substances

another kind of crystal is illustrated by _____, which of course is frozen water (H2O). The building blocks of this substance are not single ions or atoms but whole molecules. The molecules are arranged in layers of interlocking hexagons.

In order for a blend of two different substances to be called a ______, the different types of atoms have to become bonded together.

a process in which atoms of elements or compounds are rearranged to form new substances

Still more dramatic is the transformation that occurs when sodium reacts with chlorine. The product is the compound known to us as common table salt but known to chemists by its scientific name, _______ ______.

one of the most common types of chemical reactions is _______, or burning. this occurs whenever a substance reacts rapidly with oxygen.