Physical Science
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 are the states of matter?
Solid: Shape and volume Liquid: Volume but no shape Gas: No shape or volume
What is a chemical change?
Occurs when substances change into new substances
What is a physical change?
Substances do not change
What are physical properties?
Can be observed without changing composition (mass, volume, color, texture)
What are chemical properties?
Must be changed to observe (flammability, reactivity)
What is evaporation?
Liquid to gas
Explain refraction of light
Light changes speed and direction as it moves through substances
Explain reflection of light
Light bounces off
Explain the pH scale
1 to 14. 1 being the most acid and 14 being the most alkaline. 7 is neutral
What is a base?
Lots of -OH groups. (Baking soda and soap?
What is an acid?
Lost of H+ ions. (Vinegar and fruits)
How is the atmosphere composed?
Nitrogen 78% Oxygen 21% Argon .9% Trace gases .1%
What are greenhouse gases?
CO2, methane. Helpful to some extent. Create climate change
What is force?
What makes an object move. Push or pull on an object
What is gravity?
What pulls objects together
What is mass?
Amount of matter
What is wind energy?
Turbines create mechanical energy
What is energy transfer?
Energy changing forms
What is convection?
Transfer of heat by movement
What is conduction?
Transfer of heat by touch
What is radiation?
Transfer of heat through medium
What is kinetic energy?
Energy in moving objects
What is potential energy?
Stored energy
What is erosion?
Movement of sediment by wind, water or ice