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Understanding Density: Key Concepts and Applications

Explore the concept of density, its importance in determining flotation, impacts of temperature changes, and how it varies among substances. Learn to calculate density, identify materials by density, and see how temperature affects density in this interactive tutorial.

coreyfrank
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Understanding Density: Key Concepts and Applications

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  1. Density 3.4

  2. Density 3.4 • If you think that these lily pads float because they are lightweight, you are only partially correct. The ratio of the mass of an object to its volume can be used to determine whether an object floats or sinks in water.

  3. 3.4 Determining Density • Determining Density • What determines the density of a substance?

  4. 3.4 Determining Density • Density is the ratio of the mass of an object to its volume.

  5. 3.4 Determining Density • Each of these 10-g samples has a different volume because the densities vary.

  6. 3.4 Determining Density • Density is an intensive property that depends only on the composition of a substance, not on the size of the sample.

  7. 3.4 Determining Density • The density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup.

  8. Determining Density • Simulation 1 • Rank materials according to their densities.

  9. 3.4 Density and Temperature • Density and Temperature • How does a change in temperature affect density?

  10. 3.4 Density and Temperature • Experiments show that the volume of most substances increases as the temperature increases. Meanwhile, the mass remains the same. Thus, the density must change. • The density of a substance generally decreases as its temperature increases.

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  15. for Sample Problem 3.10 Problem Solving 3.47 Solve Problem 47 with the help of an interactive guided tutorial.

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  20. for Sample Problem 3.11 Problem Solving 3.48 Solve Problem 48 with the help of an interactive guided tutorial.

  21. Section Assessment • 3.4

  22. 3.4 Section Quiz • 1. If 50.0 mL of corn syrup have a mass of 68.7 g, the density of the corn syrup is • 0.737 g/mL. • 0.727 g/mL. • 1.36 g/mL. • 1.37 g/mL.

  23. 3.4 Section Quiz • 2. What is the volume of a pure gold coin that has a mass of 38.6 g? The density of gold is 19.3 g/cm3. • 0.500 cm3 • 2.00 cm3 • 38.6 cm3 • 745 cm3

  24. 3.4 Section Quiz • 3. As the temperature increases, the density of most substances • increases. • decreases. • remains the same. • increases at first and then decreases.

  25. Concept map • Concept Map 3 • Solve the Concept Map with the help of an interactive guided tutorial.

  26. END OF SHOW

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