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:
1 BELLRINGERWhat 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 H205 Molecules H20
3 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.
9 Sample Problem # 1Draw 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?
11 Sample Problem # 2What kind of matter does the following model represent? Explain your answer!
12 AnswerThis model represents a heterogenous mixture of two molecular substances, each of which consists of two types of atoms.
13 Sample Problem # 3Draw 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 ZTable 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.
18 Sample Problem # 4Answer Question #4 on your handout!
19 Sample Problem # 5The 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.