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Which is a chemical substance

Which of the following best describes a mixture?a) A pure substance with a fixed composition. b) A combination of two or more
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In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B2A ---> 3B How many molecules
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2. asked by Mark
3. 1,492 views
Which answer choices best indicate that a substance has experienced a chemical change?Select all that apply. when the substance
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2. asked by Aubrea colbert
3. 2,881 views
Which answer choices best indicate that a substance has experienced a chemical change?• when the substance changes forms •
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2. 102 views
Ethan is observing chemical and physical properties of a substance. He heats asubstance and observes that the substance turns
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2. asked by Ali
3. 175 views
Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns
1. 2 answers
2. asked by SoAestheticallyPleasing
3. 3,017 views
A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical
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2. 101 views
In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B.How many molecules of
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2. asked by bb
3. 647 views
What is a sign that a chemical change has taken place?A) A substance melts into a liquid B) A new substance is formed with
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2. 19 views
Both the physical and chemical properites of a substance can change when a substance undergoes a chemical reaction. When a log
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2. 9 views