Science Quiz
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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What is heat?
A measurement of energy
How does heat affect the density of molecules?
It’s affects it by heat, making the molecules move faster and faster/this makes the molecules move farther apart, eventually turning into either a liquid or gas 
How can hot air balloons fly?
By heat rising/the heat will collect up into the balloon start to float
What is density?
How tightly packed molecules and atoms are in an object
What state of matter is most dense why?
Solid is most dense, because atoms and molecules are more packed in together
What state of matter is least dense why?
Gas is more least dense, because the molecules and atoms are more far apart and move freely more
What is more dense, hot water or cold water? Why?
Cold water this is because cold water is closer to the state of an ice cube, which is a solid, and the hot water is closer to evaporating, which is a gas which is least dense
How does density allow a hot air balloon to float?
If the density of is very light, then it will eventually let that hot air balloon float
What is a system?
Some thing that refers to all the energy and matter with in an investigation or area of study
What are the phase changes of matter?
Solid to liquid is melting Liquid to solid is freezing Liquid to gas is evaporation Gas to liquid is condensation Gas to solid is deposition And solid to gas is sublimation
How does adding or removing energy affect matter? Use the terms, solid, liquid, and gas. In your explanation explain this in terms of the molecular level.
Energy changes molecules within the states of matter. For example, thermal energy added to a solid makes molecules move farther apart and change into a liquid. If you then remove the heat from the liquid, then turns back into a solid.