science: study physical and chemical changes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Definition of physical change | altars a substance but does not change it into another substance. ex: paper when you tear it
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| Definition of chemical change | it is changed into another substance with different properties. ex: burning wood
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| Definition of thermal energy | The total energy of a substances particles due to their movement or vibration
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| Definition of chemical energy | The energy stored within chemical bonds within matter
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| Whats true about changes in matter? | Matter changes whenever energy is added or taken away
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| What is the principle that says in every physical or chemical change the total amount of energy stays the same? | Law of Conservation of Energy
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| The change in state from solid to a liquid is called | melting
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| in most pure substances, melting occurs at a temperaturethat is specific to the substance, called the | melting point
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| the change in state from a liquid to a solid is called | freezing
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| T or F? When the temperature of water drops to 0 degrees C, its molecules form regular patterns, which are crystals | True
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| the change in state from the liquid to the gas state of matter is called | Vaporization
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| Vaporization includes... | evaporation whic occurs on the surface of the liquid; and boiling which occurs throughout the liquid
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| each liquid boils only at a certain temperature, which is called | boiling point
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| Why is the boiling point of water lower in the mountains than it is at sea level? | In the mountains, air pressure is lower, and so is the boiling point
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| The change in state from a gas to a liquid is called | condensation
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| T or F? Condensation is the opposite of vaporization. | True
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| When condensation occurs, does gas lose or gain thermal energy? | loses thermal energy
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| Example of vaporization | liquid water changes into vapor
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| Example of evaporation | a puddle dries up after a rain shower
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| Example of boiling | a pot of water on a stove reaches its boiling point
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| Example of condensation | clouds form from water vapor in the sky
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| The change in state from a solid directly to a gas without passing through the liquid state is called | sublimation
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| T or F? Changes in state are example of chemical changes. | False; physical
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| Whats true about chemical reactions? | -all chemical reactions either absorb or release energy
-in some chemical reactions, two or more substances combine, forming one or more new substances
-all chemical reactions form new substances
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Created by:
Yael
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