Chemistry

Chemistry, 27.08.2019 22:30, helo55

What do you call a substance that undergoes a change in a chemical reaction

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Chemistry, 22.07.2019 11:00, memeitupkevin

Physical science worksheet matching match each item with the correct term below. a. activation energy f. inhibitor b. catalyst g. product c. chemical reaction h. rate of reaction d. endothermic reaction a. reactant in. exothermic reaction 1. process that produces chemical change 2. substance that slows down a chemical reaction 3. reaction in which heat energy is absorbed 4. substance that exists before a chemical reaction begins 5. minimum amount of energy needed in order for a reaction to begin 6. substance formed by a chemical reaction 7. substance that speeds up a chemical reaction 8. reaction in which heat energy is released

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Chemistry, 13.09.2019 03:10, alyxkellar06

Which statements below are an appropriate hypothesis in response to this question? check all that apply. if a substance changes state of matter (e.g., liquid to gas), then this is a physical change because the original properties of the substance have not changed. if a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed. if a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed. if a precipitate is formed when two substances are mixed, then a chemical change has taken place because precipitates are new substances.

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Chemistry, 30.09.2019 08:30, nell1234565

Match each item with the correct statement below. a. can be observed without any change in the identity of the substance. b. the capacity to do work. c. can be observed only when there is a change in composition of a substance. d. substance that changes to a gas easily at room temperature. e.the fact that matter can be neither created nor destroyed in a chemical change. f. any chemical reaction that gives off energy. g. the change of one or more substances into other substances. h another term for chemical change. i. the amount of matter contained in a unit of volume. j. any chemical reaction that absorbs energy. k.the type of change in which the identity of substances does not change. choose from these 1. energy 2. volatile 3. chemical reaction 4. chemical change 5. endothermic 6. exothermic 7. density 8. physical property 9. law of conservation of mass 10. chemical property 11. physical change

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Chemistry, 30.09.2019 20:20, Dracopaul03

This lab question is: how can you distinguish a physical change from a chemical change? which statements below are an appropriate hypothesis in response to this question? check all that apply. if a substance changes state of matter (e.g., liquid to gas), then this is a physical change because the original properties of the substance have not changed. if a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed if a substance undergoes a chemical change, then it will hot retain its original properties because a new substance is formed if a precipitate is formed when two substances are mixed, then a chemical change has taken place because precipitates are new substances.

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