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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
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.
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
• 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.
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.
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.