Is Steel Homogeneous or Heterogeneous?
Is Steel Homogeneous or Heterogeneous?
Steel is homogeneous, because it is an alloy. An alloy is a solid mixture of different metal components. In a homogeneous mixture, the components contained in the mixture are uniformly distributed throughout the mixture.
In the case of stainless steel, it is an alloy made from the combination of iron with chromium and nickel. Some other alloys that are homogeneous solid mixtures are brass and bronze. There also are homogeneous gaseous and liquid mixtures. While salt water is an example of a liquid homogeneous mixture, air is an example of a homogeneous gaseous mixture.
Heterogeneous mixtures are other types of mixtures. A heterogeneous mixture consists of two or more substances that are not uniformly distributed in the mixture. Some examples of heterogeneous mixtures are oil and vinegar in salad dressing and oil plus water.
How Do You Identify Heterogeneous and Homogeneous Mixtures?
What Are Some Examples of Homogeneous and Heterogeneous Mixtures?
What Is the Difference Between Iron and Steel?
What Kind of Metals Are Cars Made From?
Phases of Matter
Matter is the �stuff� we
have been talking about for some time now.�
Everything that takes up space or has mass is made of matter.� There are four states or phases of matter
that you should be familiar with.� They
Solids –� definite shape and volume
take the shape of the container, so they have no definite shape.� They do have definite volume.
Gas–� No definite shape or volume.
Plasma-super high energy.� Rare on earth.� Common in the Sun.
�� �Matter is always in one of these states of
matter.� Which one depends on how much
energy the matter has.�
A gain or loss in energy can
cause the matter to change phases.
Lets see how this happens.
Melting–� Phase change from a
solid to a liquid.� This occurs when enough
energy is added to a solid.� Even something as solid as
rock can melt if enough heat is provided.
Phase change from a liquid to a solid.� This occurs when energy is taken away from a
solid.� When molten lava cools down, it
turns into solid rock.
Evaporation–� Phase change from a
liquid to gas.� This occurs when energy is
added to a liquid.� On hot summer days, puddles of water quickly turn into a gas (water vapor) and
disappears from sight.
Condensation–� Phase change from a
gas to a liquid.� This occurs when energy is
taken away from a gas.� The water vapor
from the puddle rises high into the air where it gets
colder.� The vapor starts to condense
into little water droplets, which eventually forms a cloud.� The water droplets on the
outside of your glass is another example of condensation.
Phase change from a solid directly to a gas.� When energy is added to some solids, like dry ice,
the matter skips the melting phase and goes directly to a gas.� This is called sublimation.
change vs. Physical change
In chemistry, a physical change occurs
when a substance changes its size or shape.�
An example of this would be chopping a log into tiny toothpicks.� You start out with a large piece of wood and
wind up with many small pieces of wood.�
You begin and end with wood.�
Changing phase is also a physical change.� When you freeze water, you get ice.� Ice is just water, only in a solid
state.� You have the same thing.� It has the same properties.
In chemistry, a chemical change occurs
when a substance changes into something entirely new.� An example of this would be taking a log and
burning it.� You start with wood and wind
up with ashes.� Ashes and wood are
different.�� Another example would be the
rusting of a nail.� You begin with iron
and you get rust.� The two are not the
same. �Iron and rust have different
properties.� One is hard and smooth, the other is flakey and rough. Getting the idea???
�A physical change is a change where
Types of Matter
Matter can be two things,
a pure substance or a mixture.
these have a fixed composition and set of physical properties.
Mixtures: two or more pure
substances mixed together.
substances can be either elements or compounds.�
Elements are also known as atoms.�
Compounds are made up of more than one atom that have been chemically combined.� Water is an example.�
Elements: any matter that cannot
be broken down into further pure substances. The elements are listed on the
periodic table: we currently know of about 115. Iron and uranium are elements
Compounds: pure substances made up
of one or more elements. Water is a compound: it is made up of two hydrogen
atoms and 1 oxygen atom. (H2O)
can be either homogeneous or heterogeneous.� They are
not chemically combined!
Homogeneous: a homogeneous mixture is
one that appears the same throughout. It is very well mixed.� Sea water is a homogeneous mixture of water,
table salt and a variety of other compounds, stainless steel is a homogeneous
mixture of iron, carbon, nickel and other elements.
Heterogeneous: mixtures that are poorly
mixed.� The substances that are mixed
together are easily seen.
Example: A banana split is a heterogeneous mixture of ice cream,
bananas, whipped cream, nuts, chocolate syrup and other things. The chocolate
syrup is a homogeneous mixture of
water, cocoa powder, sugar and other compounds.�
If you look at the syrup it all looks the same.
The thing to remember
about mixtures is that you start with some pieces, combine them, and then you
can do something to pull those pieces apart again. You wind up with the same
molecules (in the same amounts) that you started with. Compounds, on the other
hand, can not be turned back into the original parts.� There has been a chemical change.
mixture is when two or more things are put together. There are two types of
mixtures; those containing all the "same stuff" or homogeneous, and
the other containing "different stuff" or heterogeneous. Kool-aid is a mixture where all the "parts" are
the same and is an example of the homogeneous mixture. Fruit
salad as an example of the heterogeneous mixture. So a mixture is
when two things are put together but are not chemically combined
A solution is a homogenous mixture where one
thing is dissolved into another. �A
solution is made up of two parts.
Solute– the substance that gets
Solvent-the substance that does the dissolving.
substances, like sand, cannot be dissolved.�
Such substances are said to be insoluble.
is a solution.� It looks the same
throughout (yellow liquid).� It has
dissolved sugar (solute) in water and lemon juice (solvent).