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Chapter 17 Review Properties of Matter. Properties of Solids Density –Amount of matter in a certain amount of space (density = mass volume) –Refers to.

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Presentation on theme: "Chapter 17 Review Properties of Matter. Properties of Solids Density –Amount of matter in a certain amount of space (density = mass volume) –Refers to."— Presentation transcript:

1 Chapter 17 Review Properties of Matter

2 Properties of Solids Density –Amount of matter in a certain amount of space (density = mass volume) –Refers to how closely atoms or molecules are packed together –A substance is most dense in the solid phase and least dense in the gaseous phase EXCEPTION: WATER!!

3 Properties of Solids Hardness Brittleness Elasticity Malleability Tensile strength

4 Density of Fluids A substance in liquid form is less dense than in the solid form (except water) Liquids layer themselves according to density –Layered solution lab –Why NOT to put out a grease fire with water

5 Buoyancy of Fluids Buoyancy – measures the upward pressure a fluid exerts on an object Archimedes Principle – the force exerted on an object in a liquid is equal to the weight of the fluid displaced by the object All fluids do NOT exert the same buoyant force on an object

6 Buoyancy of Fluids Buoyant force > objects weight = floats Buoyant force < objects weight = sinks Buoyant force = objects weight = neither sinks nor floats

7 Buoyancy and Fluids The more fluid the object displaces, the greater the buoyant force on it (and more likely it is to float)

8 Charless Law When the temperature of a gas increases, its volume also increases (and when the temp decreases, the volume decreases) –When the air inside a basketball gets warm, it takes up more space –When the air inside the ball gets cold, it takes up less space

9 Boyles Law When the pressure of a gas increases, its volume decreases (and when the pressure decreases, its volume increases) –When a bottle of pop is opened, the compressed gas inside spreads out, taking up all the space available

10 Viscosity of Fluids Viscosity – measure of the materials resistance to flow –Depends on the size and shape of the molecules –Does NOT depend on density

11 Viscosity of Fluids For liquids, viscosity decreases when temperature increases For gases, viscosity increases when temperature increases


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