Transcript B5_Pictures of the Mind - NU-TEACH

BELLRINGER
What is the chemical formula for water? Draw
what one molecule of water looks like and
draw what 5 molecules of water looks like.
1 Molecule H20
5 Molecules H20
Pictures of the Mind
Macroscopic vs. Microscopic
 We live in a macroscopic world.
 Atoms and elements exist in a microscopic
world.
 How do atoms in tin foil look or what do
atoms in water look like?
 Create models or representations to help us
understand things.
Anatomy Models
Architecture Models
Biology Models
Model Models?
Chemistry Models
Sample Problem # 1
• Draw a model of a homogenous mixture
composed of three different gaseous
elements.
– Homogenous: Uniform throughout (compound should be
intermingled and evenly distributed)
– Can the atoms of the elements exist as diatomic molecules?
Answer
Sample Problem # 2
• What kind of matter does the following model
represent? Explain your answer!
Answer
• This model represents a heterogenous mixture
of two molecular substances, each of which
consists of two types of atoms.
Sample Problem # 3
• Draw a model of a container of each of the
following samples of matter.
– Table 1 and Table 7: Mixture of gaseous elements X
and Z.
– Table 2 and Table 6: A two-atom compound of X and
Z.
– Table 3 and Table 5: A four atom compound of X and Z
– Table 4: A solution composed of a solvent that is a
two-atom compound of L and R, and a solute that is a
compound composed of two atoms of element D and
one atom of element T.
Table 1 & Table 7
Table 2 & Table 6
Table 3 & Table 5
Table 4
Sample Problem # 4
• Answer Question #4 on your handout!
Sample Problem # 5
• The element Iodine (I) has a greater density in
its solid state than its gaseous state. Draw
models that depict and account for this
difference at the particulate (really small!)
scale. Iodine normally exists as a two-atom
molecule.
Answer # 5
Sample Problem # 5
• A chemistry student at Riverwood High School
was asked to draw a model of a mixture
composed of an element and a compound.
Comment on the usefulness of the students
drawing.
Answer # 6
Sample Problem # 7
Finish Up Sample Problem # 7 in your group.
Remember to turn the packet in before you
leave.
If you didn’t finish it then it is homework.