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25- 275=
25- 275= -250.
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Asked 5/6/2009 10:31:04 PM
Updated 3/24/2014 8:50:20 AM
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25- 275= -250.
Added 3/24/2014 8:50:20 AM
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What is a pure substance? User: What does heterogeneous mean?
Question
Not Answered
Updated 12/19/2017 12:34:16 AM
2 Answers/Comments

A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties.

Added 12/19/2017 12:33:04 AM
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Heterogeneous means: consisting of elements that are not of the same kind or nature.


Added 12/19/2017 12:34:16 AM
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What is a reactant? User: What is a product? User: What is the law of conservation of mass?
Question
Updated 11/21/2015 11:33:29 AM
3 Answers/Comments


The Law of Conservation of Mass is a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.

Added 11/21/2015 11:28:42 AM
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Product is something produced by human or mechanical effort or by a natural process.

Added 11/21/2015 11:32:50 AM
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A reactant is a substance that changes in a chemical reaction.

Added 11/21/2015 11:33:29 AM
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