Hi, I did a chemistry quiz online but some questions were not corrected: 4,7,910

 

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Hi, I did a chemistry quiz online but some questions were not corrected: 4,7,910,12,13,14,15,17,18,20 in the screenshot file. Can you read the experiment, troubleshoot incorrect answers, and give me a correct answer?  Please read the instructions and take a look at the questions before you take the order since I do not know if it’s necessary to implement the experiment or not. I just need corrected answers (corrected format) for those questions, so I don’t care whatever number you get from. 

 

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