P1 - Matter definitions 0.0 / 5 ? PhysicsMatterGCSEOCR Created by: munchlee142002Created on: 18-03-18 14:01 Bohr model of the atom A model that explains why electrons in orbit do not spiral in to the centre of the atom. 1 of 24 Change of state The process of moving from one physical state to another, for example, melting 2 of 24 Chemical reaction Process in which substances react to form different substances - irreversible 3 of 24 Degree celsius (°C) A unit of temperature 4 of 24 Density Mass ÷ volume, usually measured in Kg/m 5 of 24 Electron Subatomic particle surrounding the nucleus of an atom. It has a relative charge of -1, and a very small. 6 of 24 Electron shells The orbits around an atom that are allowed for electrons in the Bohr model 7 of 24 Gas pressure The pressure exerted by a gas due to the collisions of the particles in the gas with the container 8 of 24 Internal energy The energy of a system because of the arrangement and movement of the particles in it 9 of 24 Joules (J) The unit of energy 10 of 24 Kelvin (K) A unit of temperature 11 of 24 Mass The amount of matter, usually measured in kilograms 12 of 24 Neutrons Subatomic particle found in the nucleus of an atom. It has no charge and a relative mass of 1 13 of 24 Nucleus The small centre of an atom made up of protons and neutrons 14 of 24 Pacals (Pa) The unit of pressure, 1 Pa is equal to 1 N/m 15 of 24 Physical changes Change, such as a change of state, that does not result a new substance being made - reversible 16 of 24 Plum pudding model of the atom Outdated model of the atom in which electrons are embedded in a sphere of positive charge 17 of 24 Protons Subatomic particle found in the nucleus of an atom. It has a relative charge of +1 and a relative mass of 1 18 of 24 Rutherford model of the atom A model with a positively charged nucleus and electrons in orbit around it 19 of 24 Specific heat capacity (J/Kg) The energy required to raise the temperature of 1 Kg of a substance by 1 K 20 of 24 Specific heat of fusion The energy required to fuse or melt 1 Kg of a substance 21 of 24 Specific heat of vaporisation The energy required to vaporise or condense 1 Kg of a substance 22 of 24 Temperature A measure of the average kinetic energy of the particles in in a material. It does not depend on the amount of material that you have. 23 of 24 Volume The amount of space an object takes up, usually measured in m cubed 24 of 24
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