Physical Property
What type of reaction occurs when two or more bonded atoms of reactants break apart and form new bonds in the products
Chemical Change
what are the two mixtures we have discussed?
Heterogenous
Homogenous
What is a physical property?
When a substance undergoes a change in appearance but not in its chemical nature
What is a chemical property?
Any characteristic that gives a substance the ability to undergo a change that results in a new substance.
True or false:
If I were to burn a paper would that piece of paper loss mass?
False
Matter is never destroyed or created, the mass that you begin with is always the same as the mass you will end with.
What is the law of conservation of mass?
True or false:
Physical changes are not reversible
False
True or false:
Most chemical reactions are reversible
True
How are energy and matter related?
Any kind of change to matter involves a change in energy
Who discovered the law of conservation of mass and what reactions breaks the law?
French chemist Antoine Lavoisier, combustion
What are three examples of physical changes
Melting, burning, freezing, color changes
What are three examples of chemical reactions
Combustion, rotting, rusting, digestion
True or False
Thermal energy and temperature are the same
False
What are endothermic and exothermic reactions?
Endothermic reaction: occurs when when energy is applied
Exothermic reaction: reactions that releases energy in the form of heat
What are the other 5 physical changes of states? (One is melting)
Double points if you can tell me which states of matter each one is
Evaporation, condensation, freezing, disposition, sublimation
How are chemical reactions different from physical reactions?
Physical reactions do not change in chemical composition, whereas chemical reactions change the chemical composition
Thermal Energy Naturally flows from ________ matter to ________ matter.
Thermal Energy Naturally flows from WARMER matter to COOLER matter.
How does temperature affect density of air?
As temperature increase density decreases
As temperature decreases density increases