physical properties kinetic theory me3
DESCRIPTION
This is a powerpoint to review physical properties of matter and how they relate to kinetic theory.TRANSCRIPT
Physical properties and kinetic theoryKinetic theory or matter – States all particles of matter are constantly in motion.
State (Phase) of matter:
Q. What are two things that can happen when energy is added to a substance?
A: Change of temperature or state
Volume(Space Occupied)
Ex. Even concrete needs to expand due to heat. Expansion joints are created in bridges and roads to allow for this natural adjustment.
Q: What are two ways to measure volume?
Measuring Volume
• V=lwh
• Graduated Cylinder
• Fluid Displacement
Mass
(Amount of matter an object or substance contains)
Q. What tool might be used to find the mass of an object?
Balance
Density
Density – Amount of matter present in a certain volume.
Density = Mass/volume
Q: How does this relate to kinetic theory?
Physical properties cont.
Viscosity Tendency of a substance to resist flow
Results in slower or faster movement of substance particles.
Low energy = low heat = thickness and slow flow. Ex. (honey from refrigerator) High energy= high heat = thinner and faster flow. Ex. (honey from microwave)Kk
Substances get thicker as temperatures (energy amount) lower.Substances get thinner as temperatures rise.
How does viscosity relate to kinetic theory?
• Draw and label how the molecules of a viscous substance might be different from a non-viscous substance.
Solubility
(How a substance dissolves in a given volume of liquid.)Ex. Salt or sugar dissolves much better than dirt in a given volume of liquidWhat happens to mud or dirt when It’s put in water? Dirt in solvent(different properties than sugar)
NEW VOCABULARY!!
• Dissolving - disappearing visually in a solvent• Solute – substance (usually a solid) being
dissolved in a liquid.• Solvent – substance (usually a liquid) doing
the dissolving.
Think back to lab…
Temperature most definitely determines how quickly something can dissolve!!Sugar in hot coffee vs. cold coffee Cold Solvent Hot Solvent
MalleabilityAbility of a substance (usually metals) to be formed into different shapes without breaking.
- Metals have many uses in the world because of this property.- Can you name a few?
Physical ChangeAny change that is made to a substances physical properties - observed without changing the identity (internal makeup) of a substance. - Always ask yourself if the identity of the substance is the same or not following a change. What happens to water as it goes from liquid to a solid? Is this a physical change or not ( a chemical change)?
