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9 Cards in this Set

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A pure substance composed of atoms of only one mind


Atoms of the same element whose nuclei contain a different # of neurons

Atomic weights

Am average of the different atomic masses and proportions of its different isotopes.

Ionic bonds

Chemical bonds created by the electrical attraction between anions (-) and cations (+).

Covalent bonds

Atoms complete their outer electron shell by sharing electrons with other atoms

Hydrogen bond

The attraction between a slight positive charge atom of a polar covalent bond and a slight negative charge on a oxygen, nitrogen, or flourine atom of another polar covalent bond.


Breaks larger fragment that can't be suggested into smaller ones that can be absorbed by the digestive tract.

Synthesis reaction

Assembles smaller molecules into larger molecules


Promote chemical reactions by lowering the activation energy