What are the two different types of changes of a substance?
In one type of change the substance remains the same (physical) and in the other it becomes different (chemical)
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15
A change where one or more new substances are created?
chemical
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15
Is melting butter for popcorn a chemical or physical change?
physical
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Give 3 examples of a chemical change (where the nature of the substance changes) (from your book or not)
iron that oxidises, food rotting, a match that burns
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When you have a fire with your friends, what kind of chemical change is happening?
Chemical change (the wood is different than how it looked at the beginning after it has burned.)
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What is a sign that a chemical reaction has occurred?
change of color, presence of sediment or precipitate, production of gas, release of heat, etc
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Give 3 exmaples of a physical change (where the substance remains the same) (they don't have to be from your book)
broken pot, ice that melts, water solidifiesÂ
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rust on an iron fence. Chemical or physical change?
chemical
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Which is an example of a chemical reaction? paper cut into small pieces, chocolate melting in a pan, flour and sugar mixed in a bowl, cookies baking in an oven
cookies baking in an oven
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do you think photosynthesis is an example of a phisical or chemical change?
since water and carbon dioxide combine to form glucose and oxygen, its a clear exmaple of a chemical change
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15
Which of the following is NOT an example of a physical change? crumpled paper, pencil sharpening, shrunken clothing, or rust