Presentation on theme: "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."— Presentation transcript:
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 H 2 05 Molecules H 2 0
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.
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?
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
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.