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Density: Key Concepts and Experiments

Dive into the concept of density and its applications, including calculations, comparisons, and real-world examples. Learn how density determines if an object sinks or floats with engaging experiments and self-check exercises.

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Density: Key Concepts and Experiments

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  1. Chapter 2.6 What is density?

  2. Density Density is a measure of how tightly matter is packed into a given volume

  3. Which box has more density? 1st box has more density

  4. Which box has more density? RED BOX

  5. Formula for Density To calculate density, we use the formula Density = mass volume

  6. EXAMPLE Suppose you know the mass of an object is 30 g and the volume is 15 cm3. Density = mass/volume Density = 30g/15 cm3 Density = 2g/cm3

  7. Density Continued Density is a property that can be used to identify an object. For example… • gold = 19.3 g/cm3 • mercury = 13.6 g/cm3 • lead = 11.3 g/cm3 • silver = 10.5 g/cm3 • aluminum = 2.7 g/cm3 • rubber = 1.1 g/cm3 • water = 1.0 g/cm3 • cork = 0.24 g/cm3 • air = 0.0013 g/cm3

  8. Sink or Float??? • Matter that has a greater density that water will sink in water. • Matter with a density lower than of water will float.

  9. Coke vs. diet coke experiment • Which coke will float and which will sink??? Tell me your prediction.

  10. Did you know??? Most people can float because their density is slightly less than that of water.

  11. Self Check- page 44 • What is density? • Which would have more matter – a 1-cm cube of lead or a 1-cm cube of rubber? • Suppose you have a metal bar. It’s mass is 57.9 g and it’s volume is 3 cm3. What is it’s density? • If you cut the metal bar from question 3 in half, what would the density of each half be? • What is the metal whose density you calculated in question 3? • If you put a piece of cork in a container of water, would it sink or float? Why? Hint - Use the table on the recent slide to help answer the question.

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