solar cell:a device that generates an electric current from sunlight.
biomass: conversion:getting energy from plant and animals material by changing them into high quality fuels.
nuclear fission: fission: the spliting of a nucleus with a large mass into two nuclei with smaller masses.
change reaction:a reaction that is kept going by products of the reaction.
nuclear fusion:the merging of nuclei with smaller masses into a nucleus with a large mass.
hydroelectric:the use of flowing water to generate electricity.
thermal pollution: the excess heating of the inviroment.
science class
chistes
miércoles, 27 de abril de 2011
Temperature,Heat,and Matter
thermal expansion:the expansion of matter when its temperature is rased.
pressure:the force on each unit of area ofa surface.
melting;the change into a solid to liquid.´
vaporization: the change into a liquid to a gas as a molecule atrac each other.
condensation:the change of a gas into a liquid as the molecule attract each other.
pressure:the force on each unit of area ofa surface.
melting;the change into a solid to liquid.´
vaporization: the change into a liquid to a gas as a molecule atrac each other.
condensation:the change of a gas into a liquid as the molecule attract each other.
freezing:the change into a liquid to a gas.
boiling: the formation of bubbles of vapor that escape from a liquid that is beging heated.
domingo, 10 de abril de 2011
Temperature and Heat
Kinetic energy: the energy of a moving object.
Potential energy: energy storedin an object of materials.
Temperature: the average kinetic energy of the molecules in a materials.
heat:energy that flows between objects that have differents temperatures.
Radiations: The transfer of enrgy by elecromangnetic waves.
conduction:the transfer of energy by the flow ofa liquid or gas.
Convection:the transfer of energy by the flow of a liquid or gas.
Insulation: prevents heat from flowing in out of a materials.
Potential energy: energy storedin an object of materials.
Temperature: the average kinetic energy of the molecules in a materials.
heat:energy that flows between objects that have differents temperatures.
Radiations: The transfer of enrgy by elecromangnetic waves.
conduction:the transfer of energy by the flow ofa liquid or gas.
Convection:the transfer of energy by the flow of a liquid or gas.
Insulation: prevents heat from flowing in out of a materials.
sábado, 9 de abril de 2011
Chemical Properties
compund : a chemical combination of two or more elements.
chemical bond : a link that aoms or electrical charge particles can forms with each others.
chemical formual : a way of using letters an nubers to show how much of each element is in a substance.
ion : an electrical charge particle with unequal numbers of protons and electrons.
molecule : a group of abandoned atoms act like a single particle.
chemical properties : a way of discribing how a substance change chemicaly with other substance.
exothermic : a reaction that give the heat.
endothermic : a reactuion that absorbed heat.
chemical bond : a link that aoms or electrical charge particles can forms with each others.
chemical formual : a way of using letters an nubers to show how much of each element is in a substance.
ion : an electrical charge particle with unequal numbers of protons and electrons.
molecule : a group of abandoned atoms act like a single particle.
chemical properties : a way of discribing how a substance change chemicaly with other substance.
exothermic : a reaction that give the heat.
endothermic : a reactuion that absorbed heat.
domingo, 20 de marzo de 2011
Element and Atom
Element:a substance that cannot be broken down any futher into anything simpler.
Atom:the smallest particlee of an element that has the same chemical properties as the element.
Nucleus:an atom"s dense center, where most it mass is.
Electron:a negatively charge particle that move araund an atoms nucleus.
Proton:a posotively charge particle inside an atom nucleus.
Neutron:a particle with no charge inside an atom nucleous.´
Atomic: Number:the nbunber of protons in an atom.´
Metal:any of a grup of element that conduct head an electricity is shiny an bendable.
Atom:the smallest particlee of an element that has the same chemical properties as the element.
Nucleus:an atom"s dense center, where most it mass is.
Electron:a negatively charge particle that move araund an atoms nucleus.
Proton:a posotively charge particle inside an atom nucleus.
Neutron:a particle with no charge inside an atom nucleous.´
Atomic: Number:the nbunber of protons in an atom.´
Metal:any of a grup of element that conduct head an electricity is shiny an bendable.
Phisical Properties.
Matter:any solid,liquid,or,gas.
Mass:the amaunt os space an object take up.
2:Volume: liquid,solid =graduated liquid cylinder and solids graduated ruler (m3)
3:Density:mass,volume (g) m3 = G/m3
iron 500 C
water 100 C
blood 40 C
Mass:a measure of how hard it is to push or pull an object.
Phisical change
1.size.
2.shape.
3.state.
4.mixture.
Chemical Change
1.fermentation.
2.combustion (burning)
3.change in color
Mass:the amaunt os space an object take up.
Volume:the amaunt os sapce an object takes up.
Density:The amaunt of mass in a certain volume of material.
Physical Properties:a property can be observe without changin the identtify of a substance.
Physical Change:a change in saize,shape,or sate without forming a new substance.
Solution:a mixture of one substance dissolved in another so that the properties are the same throught.
Chemical Change:a change in matter that producers a new substance with different properties from the original.
1:Mass:balance (g) 1000=1 kg
2:Volume: liquid,solid =graduated liquid cylinder and solids graduated ruler (m3)
3:Density:mass,volume (g) m3 = G/m3
iron 500 C
water 100 C
blood 40 C
Mass:a measure of how hard it is to push or pull an object.
Phisical change
1.size.
2.shape.
3.state.
4.mixture.
Chemical Change
1.fermentation.
2.combustion (burning)
3.change in color
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