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Phy Sci-1st Sem Fin
vocabulary words
| Question | Answer |
|---|---|
| science | system of knowledge about the natural world and the methods used to find that knowledge |
| technology | use of scientific knowledge to solve practical problems |
| scientific method | organized plan used for gathering, organizing, and communicating information |
| scientific theory | well-tested explanation for a set of observations or experimental results |
| scientific law | statement that summarizes a pattern found in nature |
| element | substance that can't be broken down into simpler substances |
| atom | smallest particle of an element |
| solution | mixture that forms when substances dissolve and form a homogeneous mixture |
| physical property | any characteristic of a material that can be observed or measured without changing the composition of the substances in the material |
| chemical property | any property that produces a change in the composition of matter |
| Charles' Law | the volume of a gas is directly proportional to its temperature in kelvins if the pressure and the number of particles of the gas is constant |
| Boyle's Law | states that the volume of a gas is inversely proportional to its pressure if the temperature and the number of particles are constant |
| phase change | the reversible physical change that occurs when a substance changes from one state of matter to another |
| endothermic | the energy a substance must absorb |
| exothermic | the energy a substance releases |
| nucleus | a dense, positively charged mass located in the center of an atom |
| proton | positively charged subatomic particle that is found in the nucleus of an atom |
| electron | negatively charged subatomic particle that is found in the space outside the nucleus |
| neutron | neutral subatomic particle that is found in the nucleus of an atom |
| atomic number | a unique number for each element that equals the number of protons in an atom of an element |
| periodic table | an arrangement of elements in columns, based on a set of properties that repeat row to row |
| valence electron | an electron that is in the highest occupied energy level of an atom |
| electron dot diagram | model of an atom in which each dot represents a valence electron |
| ion | an atom or group of atoms that has a positive or negative charge |
| chemical bond | force that holds atoms or ions together |
| ionic bond | force that holds cations and anions together |
| covalent bond | chemical bond in which two atoms share a pair of valence electrons |
| alloy | mixture of two or more elements, at least one of which is a metal |
Created by:
msparks
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