June 2019 Chemistry Regents #21-25
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Questions | Answer | Links | Explanations |
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21 Which value is defined as the difference between the potential energy of
the products and the potential energy of the reactants during a chemical
reaction? (1) heat of fusion (2) heat of reaction (3) heat of deposition (4) heat of vaporization
| 2 |
products-reactants= delta H or heat of reaction | |
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22. The effect of a catalyst on a chemical reaction is to provide a new
reaction pathway that results in a different (1) potential energy of the products (2) heat of reaction (3) potential energy of the reactants (4) activation energy
| 4 | lowers activation energy | |
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23. Chemical systems in nature tend to undergo changes towards (1) lower energy and lower entropy (2) lower energy and higher entropy (3) higher energy and lower entropy (4) higher energy and higher entropy
| 2 |
lord of the flies everything burns...exothermic they go crazy...higher entropy | |
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| 24. The atom of which element bond to one
another in chains, rings, and networks? (1) barium (2) carbon (3) iodine (4) mercury
| 2 | welcome to organic chem | |
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25 What is the general formula from the homologous series that includes
ethene? (1) CnH2n (2) CnH2n-2 (3) CnH2n-6 (4) CnH2n+2
| 1 | table O alkenes | |
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