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Semester 2 vocab
vocab
Term | Definition |
---|---|
Circuit | closed conducting loop through which an electric current can flow |
Electric current | the net movement of electric charges in a single direction, measured in amperes. |
conductor | material, such as copper wire, in which electrons can move easily. |
insulator | material in which electrons are not able to move easily. |
law of conservation of charge | states that charge can be transferred from one object to another but cannot be created or destroyed. |
chemical change | change of one substance into a new substance. |
chemical property | any characteristic of substance, such as flammability, that indicates whether it can undergo a certain chemical change. |
physical change | any change in size, shape, or state of matter in which the identity of the substance remains the same. |
Law of conservation of mass | states that the mass of all substance present before a chemical change equals the mass of all the substance remaining after the change. |
kinetic theory | explanation of the behavior of molecules in matter; states that all matter is made of constantly moving particles that collide without losing energy. |
thermal expansion | sum of the kinetic and potential energy of the particles in an object; is transferred by conduction, convection, and radiation. |
viscosity | a fluid's resistance to flow. |
buoyancy | ability of a fluid - a liquid or a gas - to exert an upward force on an object immersed in the fluid. |
proton | particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+ |
neutron | neutral particle, composed of quarks, inside the nucleolus of an atoms. |
electron | particles surrounding the center of an atom that have a charge of 1-. |
atomic number | number of protons in an atom's nucleus. |
mass number | sum of the number of protons and neutrons in an atom's nucleus. |
ductile | ability of metals to be drawn into wires. |
malleable | ability of metals and alloys to be rolled or hammered into thin sheets. |
metal | element that typically is a hard, shiny solid, is malleable, and is a good conductor of heat and electricity. |
nonmetals | elements that usually is a gas or brittle solid at room temperature; is not malleable or ductile, is a poor conductor of heat and electricity, and typically not shiny. |
metalloids | element that shares some properties with metals and some with nonmetals. |
physical property | any characteristic of a material, such as size or shape, that you can observe or attempt to observe without changing the identity of the material. |