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chem vocab 1
Question | Answer |
---|---|
Reactant | The substances that are mixed together in a chemical reaction. |
Product | The substances that are created in a chemical reaction |
Valence Electrons | The elctrons in the outer most energy level that are responsible fo chemical reactions |
Chemical Formula | A way to express the type and number of atoms in a molecule |
Atom | the smallest piece of matter that stills has the same properties of the element |
Molecule | two or more atoms put together |
Subscript | A small number below the element symbol that tells you how many of those type of atoms are in the molecule |
Exothermic | A chemical reaction in which heat is given off |
Endothermic | A chemical reaction in which heat is absorbed and the product feels cold |
Ionic bond | A bond of two or more atoms when the valence electrons are transferred from one atom to the other atom |
Covalent Bond | A bond of two or more atoms when the valence electrons are shared between atoms |