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Science Final Exam
| Term | Definition |
|---|---|
| Density | mass/volume |
| Solid | state of matter that has particles put together so their shape and volume are relatively stable |
| Liquid | composed of molecules that move freely among themselves but do not tend to separate like those of gases |
| Covalent bonds | a bond that forms when atoms are sharing electrons |
| How many electrons are needed in the outer energy level for atoms to be stable? | 8 |
| Catalyst | substance that increases the rate of a chemical reaction by lowering the amount of energy needed for the reaction to occur, but is not changed by the reaction |
| Law of conservation of mass | a fundamental principle of science stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical means |
| Signs of chemical reactions | bubbles of gas appear, precipitate forms, color changes, temperature change, light is emitted. change is smell/taste |
| Exothermic | chemical reaction that gives off heat energy |
| Characteristics of acid | tastes sour, corosive |
| Characteristics of base | bitter, corosive |
| Motion | a change in the position of an object compared to another object |
| Speed | mph, m/s, km/min |
| Acceleration due to gravity | the change in velocity caused by a gravitational force |
| Acceleration | change in speed over a certain time |
| Velocity | speed in a given direction |
| Newton's 2nd Law | Force= mass x acceleration |
| Newton's 3rd Law | states that for every action there is an equal and opposite reaction |
| Law of conservation of energy | energy stays constant |
| Wedge | a simple machine that can be used to split objects apart, hold objects in place, or lift objects from the ground |
| Compound machine | a machine made up of two or more simple machines |
| Power is measured in? | watts |
| Waves travel as long as they have? | energy |
| The slower the wave? | the longer the wavelength |
| Frequency formula | F= wave speed/ wavelength |
| Amplitude | height of a wave |
| Kinetic energy formula | 1/2 (mass) x velocity^2 |
| Series circuit | a closed circuit that only has the current flow of electricity that follows one path |
| Parallel circuit | closed circuits that have a flow of electricity that follows two or more paths |
| Insulator | material that does not allow electrons to flow easily |
| Alternating current | current of electricity that can flow in two directions |
Created by:
katiecannon2002
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