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# Practice Test 3 - page 3 / 16

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We did an experiment in class where we connected the two sides of a bulb holder to the + and – ends of two separate batteries, like this:

# In this set-up the bulb did not light!

b) State which model, the two flow or the one flow, is supported by your evidence.

# This evidence supports the one flow model

c) Carefully explain why your evidence supports the model you chose and not the other model. (In so doing it would be best to also describe what would have happened if the other model were a better model.)

This evidence supports the one flow model because in the regular circuit the electric charges can flow out of one end of the battery, through the bulb, and back to the battery, through battery, and then back out into the circuit again. This could not happen in the second circuit since the charges flowing into the battery could not flow through it and back out into the circuit.

The evidence does not support the two-flow model because it says electricity flow out from both ends of the battery and meets in the bulb, making it light. If this were the case the second circuit should still work since there are connections that would still allow this to happen from the two ends of the different batteries.

• 3.

Italian salad dressing is a mixture of vinegar (density = 1.00 g/ml) and oil (density = 0.92 g/mL). When the mixture stands undisturbed for a period of time, the vinegar and oil separate into distinct layers according to their densities.

• Label the diagram depicting the layering of vinegar and oil. In the

space to the right of the picture, explain your reasoning.

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