density: is the property of matter representing the mass per unit volume.
the density of wood , plastic and steel are different.
specific heat: is the amount of energy required to raise the temperature of one gram of a substance by one degree celsius.
solubility: is the measure of how much of a substance dissolves in a given volume of a liquid.
dear, pepito
yesterday in science the teacher talk about meltiling,freezing,evaporation,sublimation,boiling and condesation.
he say that melting is the process by which a solid becomes a liquid.
freezing is the process by which a liquid becomes a solid
evaporation is a process by which liquid becomes a gas.
boiling is another process by which a liquid becomes a gas
condesation is the process by which a gas changes its state to become a liquid .
and the last but important is
sublimation is the process by which a substance changes directly from its solid state to its gas state without becoming a liquid first.
thats all we talk in the class. in the donw part i give you some picture
in the last two days, we asked to the people about properties of matter and this is these is what the people say:
what is physical properties?
is the characteristics of a substance that can be observed without changing the identify of the substance.
for example:
ann ice cube has solid state,
water has liquid state
the air has gas state.
what is physical changes?
a change in a substance that does not change the substance into a different one.
for example:
1)ice melting
2)clay being modeled into a new shape
3)butter melting on toast
4)juice box in freezer freezes
5)paper is cut in half
6)rubbing alcohol evaporates on your hand
7)water evaporates from the surface of the ocean
8)a soda can is crushed
9)a glass bottle is broken
10)a beach ball deflates
what is chemical properties?
ia a characteristic of a substance that descrribes how it can form a new substance
for example:
what is chemical changes?
is a change of a substance into another substance.
for exanmple:
1.rusting of iron
2.exploding of dynamite
3.digestion of food
4.moldy chesse
solid: is a substance liquid: has a fixed volume
that has a fixed but does not have a fixed
volume and a fixed shape. shape.
gas: has no fixed volume
or shape.
they are different because the particles of solid are together , gas are separate and liquid are together but usually father apart than the solid are.
element:a substance that cannot be broken down into a simpler substance by ordinary chemical changes. An element consists of atoms of only one type.
compound: is a substance mada up of two or more different types of atoms bonded together.
mixtures: is a combination of two or more substances.
pure matter: is the matter that no have any mixtured .
homogeneous mixture: any combination of substances that has composition and properties, a mixture that is uniform throughout.
heterogeneous mixtures: any combination of substances that does not have uniform composition and properties
a litlle, litlle,litlle piece of matter
you cant see but is next to you
is something that you only
see with a miscroscopes
atoms are really , really
small
have mass
and have electrone
and proton.
molecules are smallers
is made of atoms
have two different subtance
hydrogen and oxygen
they are small but more easy to see.
dear. chavez
mass: is the measure of how much matter an object is made of.
for example: an feather has more mass than a elephant
weight: is the downward pull on an object due to gravity.
for example: the gravity that is pulling down on both the girl and the packpack. the heavier the backpack is, the stronger the pull of gravity is on it.
masss and weight is like the same but have different property
you can get the volume of the box with the fomula:
volume=length*width*height
v=lwh
displacement: is the shifting of a actions from a desired target to a substitute targe when there is some reason why the first target is not permitted or not available.
matter: matter exist ordinarily as a solid , liquid and gas.
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