Unit 4 (SEE FC) Flashcards
Matter
Anything that has mass and volume
Plasma
Found inside stars, add hella heat: gas ➡️ plasma
Physical properties
Can be observed without altering identity of substance
Chemical properties
Can’t be observed without altering identity of substance
Flammability property
Chemical property
Color, density property
Physical property
Melting point property
Physical property
Physical changes
Don’t alter identity of substance, reversible change
Chemical change
Alter identity of substance, irreversible change
Change: Crushing, tearing
Physical
Change: Burning
Chemical
Change: melting, freezing
Physical
Change: rusting
Chemical
Physical/ Chemical changes on molecular composition
Physical: Change in physical appearance, NOT molecular composition
Chemical: Change in molecular composition, different substance from
Law of Conservation of Mass
Mass is neither created nor destroyed in a CHEMICAL reaction
Antoine Lavoisier
Performed experiments to prove that TOTAL MASS doesn’t change during ANY CHEMICAL REACTION.
Pure/ Impure substances
Pure: Elements, Compounds
Impure: Mixtures
Compound
- Contains 2+ elements bound together/ in fixed proportion
- Separated chemically
Can compounds be broken down into elements?
YES, compounds CAN be broken down into elements
Mixture
- Physically intermingled blend of 2+ substances
- Can be separated PHYSICALLY
Heterogeneous mixture
Mixture that has VISIBLY different parts
Homogeneous
- Solution, doesn’t contain visibly different parts
- Uniform
Mixture: Milk colloids
Heterogeneous
Air
Homogeneous