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Science 8 Unit A Topic 5

Science 8 Unit A Topic 5. Density . http://www.youtube.com/watch?v=0eGcVhTZEGI http://www.brainpop.com/science/matterandchemistry/measuringmatter/. Key Concepts to be covered:. Density is the amount of mass of a certain substance. p. 80

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Science 8 Unit A Topic 5

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  1. Science 8 Unit A Topic 5 Density

  2. http://www.youtube.com/watch?v=0eGcVhTZEGI • http://www.brainpop.com/science/matterandchemistry/measuringmatter/

  3. Key Concepts to be covered: • Density is the amount of mass of a certain substance. p. 80 • When comparing the 'heaviness' of substances, the masses of equal volumes of those substances are needed. p. 80 • As density increases, buoyant force increases. p. 80 • Density can be affected by heat and concentration. • Most fluids increase in density as temperature decreases, except for water, which reaches its maximum density at 4oC p. 85

  4. Measurement of Density • Density (whose symbol is the lowercase letter d) is defined as mass per unit volume. • Density is calculated by dividing the mass of an object by its volume. • This is shown in equation form, as follows: • Density = mass/volume • (Note the difference in units in the formulas of the density of a solid and liquid.)  • The unit for cubic centimeters is cm3 • For milliliters is mL. • solids: d = grams/cubic centimeters  • liquids: d = grams/milliliters  • (Table 2-5 p. Approximate Densities of Common Materials)

  5. After measuring the mass of a regularly shaped object, use a formula to determine its volume. • For example, to obtain the volume of a rectangular solid, multiply the length by the width by the height. (Volume = Length x Width x Height) • One way to determine the volume of an irregular object is to measure its mass in air and then in water, subtract the second measurement from the first, and divide by the density of water.

  6. Another way to determine the volume of an irregularly shaped object is to submerge the object in a full container of water. The volume of the object equals the volume of water that overflows, (ie. that it displaces) • To determine the volume of an object that floats, first attach a metal sinker to the object. • Next, submerge the metal sinker and measure the over-flow.  • Then submerge the object and measure the total overflow.  • The volume of the object equals the difference between the measurements. • http://www.youtube.com/watch?v=ijj58xD5fDI

  7. http://phet.colorado.edu/sims/density-and-buoyancy/density_en.htmlhttp://phet.colorado.edu/sims/density-and-buoyancy/density_en.html • http://www.youtube.com/watch?v=aSW93IfSI-Q

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