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