United worst club in preimer league
united...
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Chemistry, 22.06.2019 06:00
Compare and contrast physical changes with chemical changes.
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Chemistry, 22.06.2019 17:00
Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.
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Chemistry, 23.06.2019 00:30
Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12
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Chemistry, 23.06.2019 02:00
What are fossils of organisms that existed over a wide area but only for a limited time period called?
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