matter and its characteristics
TRANSCRIPT
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MATTER AND ITS
CHARACTERISTICS
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MATTER:
It is anything that has a mass and volume.
It is anything that has a mass and occupies a space.
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Objects are distinguished
from each other by :
Physical properties Chemical properties
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Physical properties:
1- Colour ,taste and smell.
2- Density.3- Melting point.4- Boiling point.5- Hardness.6-Electric conductivity.7- Thermal conductivity.
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** the colour ,taste and smell:
To differentiate between gold and iron we used co lour.
To differentiate between salt and sugar we used Taste.
To differentiate between perfume and vinegar we used smell.
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DENSITY:
MASS:It is the amount
of matter that the body contains.
measured٭unit :
Kg -gm
VOLUME:It is the space
that a substance occupies.
measured٭unit :
cm3
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DENSITY:
It is the mass of unit volume of matter.
OR It is the mass of one cubic
centimeters of matter.
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Density=
M
D V
Mass volume
Measuring unit:
gm\cm3
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Problems:
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Note:
Materials which have higher density than water sink in it .
Ex: iron – metallic- coin . Materials which have lower
density than water float on its surface .
Ex: ice- cork – drops of oil.
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Life applications on the density: 1- water is not used to put out
petrol fires. 2- Balloons filled with hydrogen or
helium rise up in air carrying flags during festivals.
3- the determination of the change in the of matter is taken as an evidence of the purity of matter .
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3- Melting point:
It is the temperature at which a matter begins to change from a solid state to a liquid state.
Note: different solids have a definite
melting point . some solid have low melting
point such as wax –butter some solids have high melting
point such as iron –copper.
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Life applications on melting process:
1- In manufacture of alloys copper-gold to make jewels .Nickel –chrome to make
heating coils.2- In manufacture of
cooking pots From aluminum – stainless
steel which do not rust.
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4- Boiling point It is the temperature at which a
matter begins to change from a liquid state to a gaseous state.
Note :Each substances have different boiling
point (water boil at 100 ).Life applications :Separation of the components of
petroleum oil depends on the difference between them in their boiling points.
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5- Hardness:
Some solid substances
Soft at room temperature:
Ex: rubber
Need heat to be soft and easy to shaped
Ex: metals
Do not melt by heating
Ex : coal - sulphur
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Life applications :
1- the screwdrivers are made of steel iron
because it is very hard. 2- the rods used in building houses
concrete are made of iron not copper. because the hardness of iron is
more than that of copper.
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6- Electric conductivity:Good conductors
of electricity.Substances allow
electricity of flow through.
Ex: acidic solutions
Alkaline solutionsSome salt solution Metals as iron
Bad conductors of electricity.
Substances do not allow electricity to flow through.
Ex: gases Sugary solution
solution of hydrogen chloride in benzene
Sulphur – phosphorus.
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Life applications:
1- electric wires are made of copper or aluminum and cover by plastic layer.
2- screwdrivers are made of steel iron, while their handles are made of wood or plastic.
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Thermal conductivity:
Good conductors of heat
substance that allow heat to flow through
Ex: metals iron – copper aluminum.
Bad conductors of heat
Substances that do not allow heat to flow through
Ex: wood - plastic
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Life applications:
1- cooking pans are made of aluminum
because it is good conductor of heat and has high melting point and easy to transfer heat.
2- handles of cooking pans are made of wood or plastic
because wood and plastic are bad conductors of heat.
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Chemical propertiesMetals classified according to their
chemical activity into:
Very active metals
Metals react with oxygen as soon as being exposed to humid air.
Ex sodium-potassium
Less active metals
Metals they are metals which react with oxygen if left in air for some days it is rust.
Ex: iron
In active metals
Metals react with oxygen very difficult
Ex: silver- nickel
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Give reasons:1- sodium and potassium are kept under
kerosene surface. to prevent their reaction with atmospheric
oxygen.2- steel bridges and the holders of light bulbs
painted from time to time to protect them from rust and corrosion 3- metallic spare parts of cars are covered with
grease. to protect them from rust and corrosion.4- washing of cooking pans made of aluminum
with a rough material . to remove any layer formed on them.
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Give reasons:
5- silver and gold are used in making jewels.
because they are chemically poor active .
6-nickel,gold and silver are used to cover other substances which rapidly gain rust.
to protect them from corrosion.