Which of the following are formulations of the second law of thermodynamics?

A. It isn't possible to transfer heat from an object at a lower temperature to another object at a higher temperature unless work is done.

B. All systems can convert energy from one form to another useful form with 100% efficiency.

C. It isn't possible to change heat completely into work, with no other change taking place.

D. Entropy of a system decreases over time.

Part 1: include important facts found through your research. part 2: include your visual display. include your summary of “the chemistry of water” from the national science foundation website. include your experiment. part 3: include responses to the reflection questions.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.