Name __________________________________    ____________%

Date: _________________ Period: ___________    ____________Points

1. Read the statements A through G carefully. Put an X in the space next to the ones that are operational definitions.

   _________ A. When you add nitric acid to copper, the liquid turns blue-green.

   _________ B. Perimeter of a rectangle = 2L + 2W

   _________ C. The sky is blue.

   _________ D. Density is the mass of the substance divided by the volume.

   _________ E. Density is a relationship between volume and mass.

   _________ F. Mass is different from weight.

   _________ G. When you put a lighted match to hydrogen, it pops.

2. An unknown solid has a mass of 12.6 grams and a volume of 2.68 cm³. What is the density of this unknown solid? (Show all steps of your work!)

    

    

    

    

    

3. An unknown liquid has a volume of 96.4 ml and a mass of 482.0 g. What is the density of this unknown liquid? (Show all steps of your work!)

    

    

    

    

    

    

4. If you put the unknown solid (from question #2) into the unknown liquid (from question #3) would the solid float or sink? _____________ Why do you say this?

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5. What are two uses of knowing an object's density?

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6. Your friend asks you why they always have hot air balloon races in the early morning. Explain to your friend why they do this, using the knowledge you gained in this unit.__________________________________________________________________

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7. You are filling a hot air balloon up with hot air. The air gun stops working correctly and starts blowing out cooler air. What will happen to the density of the air when the temperature decreases? __________________________________________________

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   Why does this happen to the density?

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8. What is the operational definition for density?

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Using any of the equipment at your lab station, calculate the density of Unknown Liquid A. (The liquid can be found at the supply center.)

Density of Liquid A is ___________________. Here is what I did to find the density of this liquid: (Be very detailed in your explanation.)

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Liquid X has a density of 2.64 g/ml. Liquid Z has a density of 0.77 g/ml. You just calculated the density of Liquid A. If you poured these three liquids together in a test tube they would form layers. In the test tube below, label where each liquid would be in the test tube.

Using any of the equipment at your lab station, calculate the density of Unknown Liquid B. (The liquid can be found at the supply center.)

Density of Liquid B is ___________________. Here is what I did to find the density of this liquid: (Be very detailed in your explanation.)

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Liquid X has a density of 2.64 g/mL. Liquid Z has a density of 3.66 g/mL. You just calculated the density of Liquid B. If you poured these three liquids together in a test tube they would form layers. In the test tube below, label where each liquid would be in the test tube.

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