Calculate the change internal energy (? e) for a system that is giving off 45.0 kj of heat and is performing 855 j of work on the surroundings.(pay attention to units! )a. 9.00 x 102 kjb. -9.00 x 102 kjc. �44.1 kjd. �45.9 kje. 44.1 kj

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You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

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