I just did it.
I am not sure I have correctly understood the questions 8,9, 12 and 23. Just want to let you know.
May I ask you what is this survey for please? What is its purpose? Thank you very much and good luck with your survey.

Hi

I also did my PhD in physical chemistry and also gave my chapters separately to my supervisors. I had two supervisors and the main one has only read 2 chapters out of 6. And, in my opinion, i would say that it is not normal to have your thesis checked only once, considering that it is a huge report on three and more years of work!

I don't think your concern is due to a lack of confidence. On the contrary, it is completely justified since English is not your native language. Some of my friends who had the same problem as you, asked for help from a native speaking person to correct their manuscript. It can be your friend but it is better if it is someone from the same field because they will know the technical words. I am aware that it can be a delicate issue to discuss with your supervisor and it requires diplomacy. You can openly tell her your legitime concern about your English, on top of your worries about the scientific aspects. You can politely ask her if she is happy with you asking someone else in your group to help you, JUST for the English. I hope that my suggestion is useful to you.

Good luck!