T1L3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Physical change
Alters something’s form or appearance but doesn’t change it into a different substance
Chemical change
A change that produces one or more new substances
What is the law of conservation?
Matter is never lost or gained during chemical or physical changes
What is temperature?
The average kinetic energy of all particles in a object
What is thermal energy?
the total energy of motion of all particles in a object
What is an open system?
an open system is a system that can freely exchange matter and energy with its surroundings.
What is a closed system?
a system in which matter cannot escape or be added to an environment due to some type of boundary.
How does TE flow?
thermal energy naturally flows from warmer matter to cooler matter
How is energy and matter related?
change in matter leads to a change in energy (ex. bending a paperclip takes energy)
What are a few signs of a chemical reaction?
release of a gas, temperature change, color change, and formation of a precipitate (a precipitate is a substance separated from a solution or suspension by chemical or physical change usually as an insoluble amorphous or crystalline solid.)