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Science Final Exam

TermDefinition
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