1. An endothermic reaction energy. A. eliminates B. generates C. None of these D. absorbs 2.The energy change in an endothermic reaction is: A. External B. Positive C. Negative D. Internal 3.What is the total energy change for the following reaction: H2 + I2 -> 2HI? Given: H-H bond: 436 kJ/mol I-I bond: 151 kJ/mol H-I bond: 297 kJ/mol A. +297 kJ/mol B. +7 kJ/mol C. -7 kJ/mol D. -290 kJ/mol 4.While camping you light a small campfire, initiating the combustion of wood to produce heat and light. What can you determine about this reaction? A. It is endothermic. B. The bond breaking energy is more than 600 kJ. C. It is exothermic. D. The bond making energy is more than 600 kJ.
Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction
An unknown substance has been shown to have weak covalent bonds. which of the following is most likely a property of this substance? a. high ph b. high conductivity c. low melting point d. low flammability
An unknown substance is a white solid at room temperature and has a melting point of 78 ยฐc. which of the following substances is most likely to be the identity of the unknown sample?
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