Classification of matter
essay
“Science
... is organized common sense.” Josepsech Alexander Leighton. Just like
Leighton said, science is common sense; so too is the classification of matter.
The smallest building block of the classification of matter is, simply, matter.
Matter is any substance or material comprised of molecules and atoms. The
classification of matter places matter into different categories including
elements, compounds, substances, and mixtures, based on its physical and
chemical properties.
The
simplest classification of matter is an element. An element is a substance that
is composed of one single type of atom that cannot be broken down. Elements are
organized on the periodic table and are characterized specifically by their
unique atomic number. People come across elements everyday, from the Gold and
Silver in our jewelry to the Nitrogen and Oxygen we breathe. There are 118
known elements on the periodic table today, starting with Hydrogen and ending
with Ununoctium. A more complex category
in the classification of matter is compounds. A compound is a substance that
consists of more than one type of atom chemically bonded together. In a
compound every molecule is the same and can only be separated chemically.
Compounds are made up of elements. For example, table salt is Sodium and
Chloride and water is Hydrogen and Oxygen. What distinguishes compounds from
elements is that elements cannot be separated but compounds can. Because of the
unlimited combinations of elements, compounds cannot be classified on a simple
table like elements. When doing the classification of matter POGIL, I learned
that both compounds and elements are pure substances because their composite
particles are identical. In the ‘separating-a-mixture’ lab, I worked with my
group to separate Iron, salt and sand. This experiment allowed us to appreciate
that Iron is a single element while salt is a compound and sand is a mixture.
Just
as an element is a simple category in the classification of matter and a
compound is more complex, a pure substance is simpler than a mixture. A pure substance is a form of matter with
uniform molecules. Elements and compounds are pure substances but elements are
in their simplest state and compounds can be chemically broken down into their
separate components. In contrast, a mixture is formed when more than one type
of matter is mixed together. Mixtures can be composed of pure substances and
can be separated chemically or physically. Mixtures are described as either
heterogeneous or homogeneous. A homogeneous mixture looks the same throughout
whereas a heterogeneous has visible differences. For instance, chocolate ice
cream is a homogeneous mixture whereas chocolate chip ice cream is a
heterogeneous mixture. In class we observed the distillation of cherry coke.
This demonstration showed us how the heterogenous mixture of cherry coke was
separated into water, carbon dioxide, and flavoring. We also learned about the
method of chromatography which separates mixtures using water and
chromatographic paper.
Simple
and Complex categories of matter are described using physical and chemical
properties. Physical properties can be classified either qualitatively or
quantitatively while chemical properties describe how substances react with
other atoms or molecules to produce new substances with different properties.
Qualitative physical properties are those that can be visually observed about a
substance. Shape, texture, color, and state are examples of physical properties.
Unlike qualitative physical properties, quantitative physical properties deal
with numbers and are labeled as intensive or extensive. An intensive property
such as density or boiling point is the same regardless of quantity. In
contrast, an extensive property such as volume or mass does change with
quantity. As opposed to the physical properties of matter, the chemical
properties of matter detail reactions with other particles that produce new
substances with different properties. Reactivity to acid, pH, and heat of
combustion are chemical properties. Physical and chemical changes are used to
accurately observe properties of a substance in a lab. A physical change as it
relates to matter does not change the structure of atoms or molecules; it only
affects physical properties. Melting, freezing, condensing, and dissolving in
water are all physical changes. A reaction to a substance that produces a new
substance with unique chemical properties is a chemical change. Burning,
oxidizing, or reacting with acid are all chemical changes. Chemical changes may
or may not be reversible. One way to tell if there has been a chemical change
is to look for a the formation of a precipitate, a color change, a change in
temperature, or a production of a gas. During the Evidence of Chemical Change
Lab and The Iron and Sulfur Lab our class observed drastic chemical changes
that alter both the appearance and properties of a substance.
In
conclusion, science categorizes matter many different ways; into substances,
elements, compounds, and mixtures while describing it as having chemical or
physical properties, but from the copper pennies in your wallet to the gold
ring on your finger, ‘matter’ will always ‘matter.’
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