CHAPTER 8

Electindo.comPHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY AND CHEMICAL PROPERTY

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY AND CHEMICAL PROPERTY

Extensive property : matreial property that depends on the amount and the size of substance such as volume, mass, and weight.

Intensive property : the material property that depends on neither the amount nor the size of substance, such as colour, aroma, freezing, melting, soluting, steaming, and sublimating.The intensive property of material can be grouped into two kinds as follows:

Physical property: the material property that can be observed where it does not change permanently, such as colour, aroma, taste, hardness, boiling point, and melting point.

Chemical property: the material property that can be observed while it is changing permanently, such as colour change, reactivity, stability, etc.

Material property

Extensive property

Intensive property

Physical property

Chemical property

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY

A.PHYSICAL PROPERTY

SUBSTANCE FORM

we have recognized three kinds of substance, solid, liquid, and gas.

THE DIFFERENCES BETWEEN SOLID, LIQUID, AND GAS NU

.

SOLID LIQUID GAS

1.

2.

3.

Having certain

volume and shape

close-distance

particle

Particles can not

move freely

The shape changes

to the container

shape, having

certain volume.

Rather wide apart

particles

Particles can move

rather freely

Not having shape

and the volume

depends on the

place

Wide apart

particles

Particles can move

very freely

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY

TURBIDITY

Turbidity occurs for liquid. Liquid turbidity is caused by the soft suspension particle. If light passes through the turbid liquid, the intensity will get down by spreading out.

VISCOSITY

Viscosity is the standard of substance resistance in flowing. To know the flow rate of liquid, we can use viscometer. Flow rate is used for counting the index of viscosity.

index of viscosity can be formulated as follows :Index of viscosity

Liquid flow rate

Water flow rate

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY

BOILING POINT

Boiling point is the temperature while a liquid is boiling. Boiling is different with evaporating, boiling occurs when it is in certain temperature, or boiling point. While evaporating occurs in any temperature below the boiling point, for example when we are drying clothes, the water is evaporating, not boiling.

MELTING POINT

Melting point is the temperature when solid substance becomes liquid substance, such as the salt melts because of heating.

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

PHYSICAL PROPERTY

SOLUBILITY

Solubility explains the level of soluble substance. The grain of salt contains ion of natrium and chloride that are bound together in a formation called crystal-grid. Water solutes the salt by pulling the ion from crystal-grid and keep staying around(circuming ambulate). Solubility is influenced by some factors as follows :a) Temperature b) Solvent volumec) Size of soluble substanced) Kind of soluble substancee) kind of solvent

Water molecules

Chloride ion

Natrium ion

Water molecules pull the crystal

ions

Water molecules stay around the

ion

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

CHEMICAL PROPERTY

BURNABLE

by knowing the characteristics of burnable substances, we will be able to use it safely.

DECOMPOSED AND SOUR

The chemical reaction occurring on food or drink makes them decomposed and taste sour. For instance, letting rice reacts with air for days will cause the rice rotten. The milk becoming sour.

B. CHEMICAL PROPERTY

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

CHEMICAL PROPERTY

CORROSION

The reaction between metal and oxygen causes corrosion. Metal like iron and zinc are very easy to corrode.

EXPLOSIVE

The interaction of some substances with oxygen is possible to cause explosion, e.g. : magnesium, uranium, and natrium.

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

CHEMICAL PROPERTY

POISONOUSThere are some poisonous chemical substances, e.g. : insecticide, pesticide, fungicide, herbicide, and rat poison. Those poisonous substances used by human for kill of the insects and rats.  

Insecticide

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PHYSICS FOR JUNIOR HIGH SCHOOL VII

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