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30 Cards in this Set

  • Front
  • Back
what is matter and the the three states it is found?
anything that occupies space and has weight, solids liquids gases
what is an element
a substance which cannont be reduced to a simpler substance by chemical means
what is a compound
a substance containing two or more substances
what is the difference of a compound and mixture?
a compound is a chemical combination of elements that cannont be seperated by physical means, a misture is a physical combo of elements and compounds that are not chemicaly combined
what is a molecule
a chemical combo of two or more atoms
what are the three types of subatomic particals and their charges?
electrons-neg protrons-post, neutrons-neutral
what is the energy of motion called?
kinetic engery
how is light achieved in a fluoresent light?
invisible light photons bombard the phosphor atime in the light tube.
what determins the valenance of an atom?
the number of electronsin the outer shell
what is an ion
an atom with more or less than its normal number of electrons
what determines wheiter a substance is a conductor or insulator?
the number of atoms in the valence shell
how is a negative charge created in a nuetral body?
throught the accumulation of excess el;ectrons
how are static charges created?
by friction
what is the electrical charge of a atom which contains 8 protrons and 11 electrons
what is the realationship between charges bodies?
like charges repel
unlike charges attract
what is an electro static field
the space between and around charged bodies
in what direction are electrostatic lines of force drawn?
leaving the postive and entering the negative
what are examples of electrical equiptments which use magentisum
motors generators speakers computers televisions tape recorders and many others
what are magnetic materials
those materials that are attracted by magnets and have the ability to become magnetized.
what characterisitics do all ferromagnetic have in common?
the reative eease with which they are magnetized
what type of magnetic material shoud be used to make a temporary magnetic
a materal that wxhibits low reluctance and high permeability such as iron or soft steel
what is retentivity?
the ability to retain magnetizium
how does the laws of magnetic poles relate to the laws of electrical charges?
they are very similar like charges repepl unlike attract, like poles repel and unlike poles attract.
a compass is located at the geographical north pole, in which direction is the needle pointed?
to the magentic north
using webers molecular thoery of magnetisum describe the polartiy of the poles from right ot left?
south pole to the right north to the left.
what is the difference between webers theroy and domain theroy?
the domain theory is based upon the electron spin
webers thoery is uses the concept of tiny molecular magnets
what purpose would you sprinkle iron fillings on the glass plate?
to enable you to se the magnetic field
what pattern would be formed iof you sprinkled sawdust on the glass plate?
no specific pattern, sawdust is a nonmagnet material
what is a magnetic lines of force?
an imaginary line used to illustrate magnetic effects
in what way do magnetic lines of force differ from electrostatic lines of force.
electrostatic lines of force do not form closed loops