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Bonds and reactions
chapter 10 vocabulary
Term | Definition |
---|---|
Valence Electron | The electrons that are in the highest energy level of an atom and that are involved in chemical bonding. They are in the outer shell. |
Electron Dot Diagram | A representation (picture) of the VALENCE ELECTRONS in an atom, using dots. |
Chemical Bond | The force of attraction that holds 2 atoms together. |
Ion | An atom or group of atoms that has become electrically charged. |
Polyatomic Ion | An ion that is made up of more than one atom. |
Ionic Bond | The attraction between oppositely charged atoms. |
Ionic Compound | A compound that consists of (has) positive and negative atoms. |
Chemical Formula | Symbols that show the elements in a compound and the ratio of atoms. |
Subscript | A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound. |
Crystal | A solid in which the atoms are arranged in a pattern that repeats again and again. |
Covalent Bond | A chemical bond that forms when two atoms share electrons. |
Molecule | A neutral group of two or more atoms that are held together by covalent bonds. |
Double Bond | A chemical bond formed when atoms share two pairs of electrons. |
Triple Bond | A chemical bond formed when atoms share three pairs of electrons. |
Molecular Compound | A compound that is composed of molecules |
Nonpolar bond | A covalent bond in which electrons are shared equally. |
Polar Bond | A covalent bond in which electrons are shared unequally. |
Physical Change | A change that alters the form or appearance of a material but does not make the material into another substance. |
Chemical Change | A change in which one or more substances combine or break apart to form a new substance. |
Reactant | A substance that enters into a chemical reaction. |
Product | A substance formed as a result of a chemical reaction. |
Precipitate | A solid that forms from a solution during a chemical reaction. |
Exothermic Reaction | A reaction that releases energy, usually in the form of heat. |
Endothermic Reaction | A reaction that absorbs energy. |
Chemical Equation | A short, easy way, to show a chemical reaction, using symbols. |
Law of Conservation of Mass | The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change. |
Open System | A system in which matter can enter from or escape into the surroundings. |
Coefficient | A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction. |
Synthesis | A chemical reaction in which two or more simple substances combines to form a new, more complex substance. |
Decomposition | A chemical reaction that breaks down compounds into simpler products. |
Replacement | A reaction in which one element replaces another in a compound or when two elements in different compounds trade places |