Notes on Properties Webpage
1) A property is the basic characteristics of a substance so that you can define them. Some type of observation.
2) Extensive property
3) intensive (chemical properties)
4) The base units are not changing
5) When the base units rearrange-new arrangements to create base particles
Notes on Physical and Chemical change
6) The main difference is the fact that the base units don’t change in physical properties and chemical properties can change or rearrange.
7) True - Every time:
8a) Released from system to the surrounding
8b) Requires energy to be put into the system from the surrounding
9a) Law of Conservation of Mass (matter cannot be created or destroyed) and Law of Conservation of Energy (energy cannot be created or destroyed)
Phases of Matter - Physical Change
Since changing phase is a physical change, what can you tell about base unit/particles?
They are not changing throughout all of the stages of matterFour phases of matter are: Intermolecular Force (IMF) - force that holds one particle near another particle Anytime you have a physical change is because the base particle is exerting force on another particle Solid: The particles do not move into 3D space, they only vibrate because the IMF is so great Shape: occupies its own shape Particles spacing: very compact Energy: ___ not compressible___ (can overcome IMF or not) Liquid: they have enough energy to move into 3D space. IMF doesn’t allow particles to move anywhere separately. Shape: occupies shape of container Particle spacing: close together but not compact Energy _not compressible_(can overcome IMF)
Condensed phase is name people give to either solid or liquid phase
Gas def: obtain energy to overcome molecular forces Shape: can take any shape Particle spacing: occupies all volumes, very far apart Energy __compressible__(can overcome IMF)
If you significantly more energy to gas particles, then you get Plasma: It is a form of matter that floats around freely Energy is needed to from one phase to another. Energy is used to change how particles relate to each other and not give energy equally to all particle (called increase temperature).
Notes from Observation of a Chemical Reaction.
What are the four observation that a chemical reaction occurred. A permanent color change - indicates a chemical reaction Gas is generated. Gas can have an odor or not - it forms bubbles and the bubbles contain the gas that have a “skin”, which is water Energy change Precipitation formed - solid that is forming in a solution
Can any of these observations be also an observation of a physical change/process. Explain.
No because they have different properties. The physical properties of a particle says that the base units do not change, making the observations different.