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32 Cards in this Set

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