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**DENSITY Q) Which weighs more:-**

A kilogram of feathers or a kilogram of iron? DENSITY

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**Density is the Mass per unit Volume**

What is Density? If you take the same volume of different substances, then they will weigh different amounts. Wood Water Iron 1 cm3 1 cm3 1 cm3 IRON 0.50 g 1.00 g 8.00 g Q) Which has the greatest mass and therefore the most dense? Density is the Mass per unit Volume

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**Cube Representations 1 m3 = 1 000 000 cm3**

Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 119

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**Density Equation: d = m V Mass Density = Volume Example:**

g Mass Density = Volume g/cm3 cm3 d = m V Example: Q) A gold-colored ring has a mass of 18.9 grams and a volume of 1.12 cm3. Is the ring pure gold? (The density of gold is 19.3 g/ cm3.) d = m = 18.9g = g/cm3 V cm3 No – it is not pure gold!

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**DENSITY OF A REGULAR SOLID**

Find the Mass of the solid on a balance. Measure the three lengths and calculate the Volume. (i.e., V = l x w x h ) Calculate the Density. m = 240 g 2.0 cm d = m = 240 =10.0 g/cm3 V (2cm * 3cm * 4cm = 24 cm3) 3.0 cm 4.0 cm

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**DENSITY OF AN IRREGULAR SOLID**

m = 360 g d = m = 360 =12.0 g/cm3 V Find the Mass of the solid on a balance. Fill the Measuring Cylinder with Water to a known Volume. Add the Object. Work out the Volume of Water that is displaced. Calculate the Density. 80 cm3 50 cm3

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**it floats What happens when you put an object in a fluid?**

If the object is less dense than the fluid… it floats

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**it sinks! What happens when you put an object in a fluid?**

If the object is more dense than the fluid… it sinks!

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**Neither floats nor sinks!**

What happens when you put an object in a fluid? If the object is as dense as the fluid… Neither floats nor sinks!

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