1. Chapter 17 Notes

2. Properties of Solids
Density- describes the relationship b/t mass and volume of homogenous material- tells how tightly molecules are “packed”
Formula: D=m/v
What are the units of density?
Density stays the same no matter how large or small the sample is
Heterogenous materials may not have the same density throughout

3. Other properties Hardness-resistance to scratching
Elasticity-ability to stretch then return to original shape
Brittleness-tendency to shatter on impact
Malleability- ability to be pounded into sheets
Tensile strength- measures how much tension a material can withstand without breaking

4. Density of Fluids
Fluid- matter with the ability to flow (applies to gases too)
How can a liquid form of the same material be less dense than the solid form?
How does temperature affect density of solids?
Why is ice less dense than liquid water?
What would happen if ice became more dense than water?

5. Buoyancy The measure of the upward force a fluid exerts on an object
Archimedes principle- the force exerted on the object is = to the weight of fluid displaced by the object

6. Sink or float?
If buoyant force of fluid is greater than weight of object-object floats
If buoyant force of fluid is less than weight of object- object sinks
If forces are = will stay in place (neutral buoyancy
Why is neutral buoyancy necessary for scuba divers?

7. Does shape matter? Yes, because the shape may displace more water.
How can steel boats float, and steel cubes sink?

8. Viscosity Material’s resistance to flow
Which has a higher viscosity: maple syrup or water?
Why is viscosity important?
Viscosity is determined by the shape and surface of molecules (friction)

9. Temperature and viscosity
As temp increases liquids usually become less viscous
Gases become MORE viscous with increasing temperature Why?