1) Melting Point a) The temperature at which a solid changes to a liquid. (Physical Change) b) The temperature at which a liquid changes to a solid. (Physical Change) 2) Sublimation a) the process of a solid changing to a gas (ex: dry ice) b) The temperature at which a liquid changes to a gas. (Physical Change) 3) Evaporation  a) The temperature at which a liquid changes to a solid. (Physical Change) b) change in state from a liquid to a gas (+heat) 4) Condensation a) change in state from a gas to a liquid (-heat) b) The temperature at which a liquid changes to a solid. (Physical Change) 5) Atom a) change in state from a liquid to a gas (+heat) b) The smallest unit of matter that retains the identity of a substance. 6) Proton a) Subatomic particle with a positive charge and located in the nucleus of an atom. The number of protons gives the atom its identity. b) The smallest unit of matter that retains the identity of a substance. 7) Neutron a) Subatomic particle with no charge (neutral), the same mass as a proton, and located in the nucleus of an atom. b) Subatomic particle with a negative charge and located outside the nucleus. 8) Electron a) Subatomic particle with a negative charge and located outside the nucleus. b) The temperature at which a liquid changes to a gas. (Physical Change) 9) Valence electron a) electrons located on the last shell or energy level of an atom b) The number of protons in the nucleus of an atom. This number identifies the atom as a specific element. 10) Nucleus a) The number of protons in the nucleus of an atom. This number identifies the atom as a specific element. b) The center of the atom - made up of protons and neutrons

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