Classification of Matter Part I
How do atoms combine to make different types of matter?
Why? Look at the things in this room. They are all matter. That matter may be pure or it may be a mixture. Can you
tell by looking at it? What if you looked at it under a microscope? Then could you tell? Something that looks pure may
not really be pure. It depends on what type of particles that thing is made of. In this activity we will explore how the
smallest chemical units of matter determine whether something is an element, a compound, or a mixture.
Model 1
Directions: Use Model 1 that is taped into your notebook to answer the following questions. Please answer all
questions in complete sentences for credit.
1.
Circle a molecule of RSq in Model 1. How many atoms are in a molecule of RSq?
In a molecule of Rsq, there are _____ atoms.
2. Circle a molecule of TSq2R in Model 1.
a. How many different types of atoms are found in a molecule of TSq2R?
In a molecule of TSq2R, there are _____ different types of atoms.
b. Draw the different types of atoms in a molecule of TSq2R:
c. How many Sq atoms are in a molecule of TSqR? Explain how you know.
There are ______ Sq atoms in a molecule of TSqR. I know this because…
3.
a. How many different types of atoms are found in a sample of SqR3? There are _____ different types of atoms in
SqR3.
Draw them:
b. How many different types of atoms are found in a sample of TSq? There are ____ different types of atoms in
TSq.
Draw them:
c. How many different types of molecules are found in a sample of SqR3? In TSq?
4. When two atoms are touching in the drawings of Model 1, what is holding the atoms together?
(answer in a complete sentence)
5. a. Can a particle be a single atom?
A particle can/cannot be a single atom. For example, …….
b. Can a particle be a molecule? (Give an example in your answer and answer in complete sentences).
A particle can/cannot be a molecule. For example, ….
c. How many particles are in the drawing representing T & RSq & R in Model 1?
There are _____ particles in the drawing representing T & RSq & R.
d. As a group, agree on a definition of the word “particle”, as it is used in chemistry.
In chemistry, the word particle means
6.
Compare the codes listed at the top of each drawing in Model 1 with the shapes in that box.
a. What do the letters R, Sq, and T in the codes represent?
The letters R, Sq, and T represent …..
b. What do the small numbers (subscripts) in the codes represent?
The subscripts represent …..
c. When atoms are touching, how is that communicated in the code?
I know atoms are touching because….
d. When atoms or molecules are not touching, how is that communicated in the code?
I know that atoms or molecules are not touching because…..
e. In Model 1, there are three drawings that are labeled “?”. Write codes to properly label these drawings.
7.
Study the following key.
represents H
represents O
Draw models of each type of particle as indicated in the box.
5 particles of H2O
3 particles of CH4CH3OH
7 particles of H2
3 particles of CH3OH
In each box above, label 1 chemical bond.
STOP! Get teacher credit before continuing on to Part II.
represents C
CLASS SET – WRITE IN NOTEBOOK
Classification of Matter – Part II
Directions: Answer in complete sentences in your notebook.
1. Using the cut out pictures provided, as a team, sort the pictures into those where all the
particles are in the drawing are identical, and those that have more than one type of
particle in the drawing.
READ THIS!
Matter is classified as a pure substance when all of the particles in the drawing are
identical. Matter is classified as a mixture if there are different types of particles present.
2. Identify which set of drawings from #1 are pure substances and which set are mixtures.
List the codes for each set here:
PURE SUBSTANCES
MIXTURES
3. Explain how the codes (chemical formulas) for pure substances are different from those
of mixtures. Give an example.
The codes (chemical formulas) for pure substances are different from mixtures
because………… For example,___________ is just a pure substance, while _______ is a
mixture..
4. As a team, take the set of pure substance drawings from #2 and sort them into those
containing only one type of atom and those with two or more types of atoms.
READ THIS!
Elements are defined as pure substances made from only one type of atom.
Compounds are defined as pure substances made from two or more types of
atoms.
5. Identify which set of drawings from #4 are elements and which are compounds.
List the codes for each set here:
ELEMENTS
COMPOUNDS
6.
Explain how the codes (chemical formulas) for elements are different from the codes
(chemical formulas) of compounds. Give an example.
The chemicals formulas for elements have________________ whereas the chemical
formulas for compounds have _______________. An example of a chemical formula for
an element is _________________, whereas an example of a chemical formula for a
compound is _____________________.
7. Use what you have just learned about chemical formulas to identify the following as an
element, compound, or mixture. Explain why.
a. Br2
b. NaHCO3
c. C6H12O6 & H2O
d. Cu & Zn
e. CO2
f. Al
CLASSIFICATION OF MATTER – Extension Questions
Directions: Answer in complete sentences in your notebook
1. Often times it is useful to separate matter ( Examples: straining cooked pasta to get the
liquid out, using a fuel cell to separate water into hydrogen and oxygen).
a.
Physical methods of separation (filtering, distillation) do not require a chemical
change. In other words, no chemical bonds are broken or formed during the
separation. Which types of matter (mixtures/compounds/elements) could be
separated by physical methods? Explain.
b. Chemical methods of separation (decomposition, electrolysis) require a chemical
change. In other words, chemical bonds are broken and/or formed during the
separation. Which types of matter (mixtures/compounds/elements) would need to
be separated by chemical methods?
2. Students in a chemistry course were asked the following question on a unit exam.
“Draw a diagram representing an element using circles as atoms.”
a. The following diagrams represent the two types of answers given by students. Which
drawing is the best representation of an element? Explain.