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1. Experimental Design: From the work you have done this semester, choose a topic and
design an experiment you would be able to perform. In your design (1) state your
hypothesis, (2) identify your dependent and (3) independent variables, (4) your control
conditions and (5) describe your experimental procedure. You do NOT have to actually
complete the experiment, just describe it with the application of the terms above.
Combustion. My hypothesis is that when you spray sunscreen (TiO2) in the flame of a
lighter (C10H4) will cause the same effects as a blow torch. The spray sunscreen is
dependent on the flame of the lighter. The spray sunscreen is dependent. The flame of the
lighter is independent. The controlled conditions are how much sunscreen you spray and
how long you allow the flame of the lighter to burn. First, you will find a lighter and a
spray bottle of sunscreen, then you will light the lighter so there is a flame (C10H4) safely
you will face the spray sunscreen away from you and spray the sunscreen (TiO2) onto the
flame and you will see the same effects as a blow torch.
2. Perform this operation and report the answer to the correct number of significant
figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The
density of aluminum is 2.7 g/cm3. Show all calculations leading to an answer.
Volume of cube = 4.0 3 = 64cm 3
Density = 2.7 g / cm 3
Mass = ?
Mass = Density Volume
= 64cm 3 2.7 g / cm 3 = 170 g
3. Explain why a model of the atom is crucial to understanding chemistry and in explaining
the behavior of matter. Use 3 - 4 sentences in your explan...