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32 Cards in this Set
- Front
- Back
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What is electric current?
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flow of charge
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What is a conductor?
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substance that electric charge flows through readily
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What is energy?
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the ability to do work
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What is work?
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when a force moves an object some distance (W = F x D)
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Energy Change in Looking at a Picture
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light-->electrical
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Energy Change in Burning of Fossil Fuels
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chemical-->heat
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Energy Change in Melting of Ice
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heat-->potential
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Energy Change in Burning Coal to move the Wheels on a Train
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chemical-->heat-->mechanical
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forms of KE
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electrical, electromagnetic, heat
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forms of PE
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chemical, magnetic
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SI unit for energy
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Joule
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law of conservation of energy & how does it apply to reactions
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no energy can be created or destroyed only changed from one form to another; what a reaction starts with, it must end with
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2 types of reactions
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exothermic (releases heat) & endothermic (absorbing heat)
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What is activation energy?
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energy that sparks a reaction
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What is the term hot referring to?
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high temperature
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Is there such a thing as cold from a scientific point of view?
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no
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How did we create the Celsius scale?
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made the freezing point 0 degrees, and made the boiling point 100 degrees
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How was the Kelvin scale created?
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made 0 degrees set to absolute 0 and used the same increments as Celsius scale
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What is absolute zero and what happens there?
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lowest possible temperature; motion is fully stopped
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How many K do you go up by if you increase the temperature 5 degrees Celsius?
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5K
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Heat flows from...
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hot to cold
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What is a calorie?
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non SI unit for heat; quantity of heat that will increase the temperature of 1 gram of water 1 degree Celsius
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What is calorimetry?
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the measurement of how much heat is released or absorbed during a chemical reaction
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What is a calorimeter?
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a device that has a chamber surrounded by water
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What is specific heat?
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amount of heat required to raise the temperature of 1 unit of mass (g) by 1 unit of temp. (degree C)
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What is Kinetic molecular theory?
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all matter is made up of particles
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Temperature is the measure of average...
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KE
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How can you add heat to something and not change its temperature?
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the heat goes to a process instead of a substance
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If an object has 25 protons and 25 electrons what is its charge?
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neutral (0)
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What is the force that pushes or pulls charged bodies together or apart?
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electrostatic force
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What is the law of conservation of charge?
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When 2 charges of equal amount bu topposite signs are brought together, their electrostatic forces cancel each other out
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What is electrical energy?
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energy used to move charged bodies against an electrostatic force, is converted to PE or electrical energy
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