DENSITY Q) Which weighs more:-

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Presentation transcript:

DENSITY Q) Which weighs more:- A kilogram of feathers or a kilogram of iron? DENSITY

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

Cube Representations 1 m3 = 1 000 000 cm3 Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 119

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 = 16.88 g/cm3 V 1.12cm3 No – it is not pure gold!

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 24 (2cm * 3cm * 4cm = 24 cm3) 3.0 cm 4.0 cm

DENSITY OF AN IRREGULAR SOLID m = 360 g d = m = 360 =12.0 g/cm3 V 30 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

it floats What happens when you put an object in a fluid? If the object is less dense than the fluid… it floats

it sinks! What happens when you put an object in a fluid? If the object is more dense than the fluid… it sinks!

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!