Those things which render the Salaah invalid

Q: I was wondering if my Salaah is invalidated if I make sounds during the Salaah when going down into sajda as a result of feeling a pain in my foot?

Q: As far as I am aware, speaking intentionally or unintentionally will nullify the salaah and it will have to be re-prayed again according to the hanafi maddhab (although, if I am incorrect in my understanding then please correct me jazak Allah khayr). The question I would like to ask is that say for example, if I recite اَللَّهُمَّ رَ‌بَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَ‌ةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ‌ and in my heart I say Aameen but my tongue may move slightly unintentionally, however there is no sound of any letters coming out, can that be classed as speaking in Salaah?

Q: If I carry out my fard salaah and later after the time where the salaah is valid, find out that I did an action that would have invalidated the salaah, is it sufficient for me to not repeat that mistake in all future prayers or must I make up the salaahs that I unknowingly carried out the mistake in?

Q: If the toes do slide slowly during sajdah (because the prayer rug is slippery) without it lifting off the ground, is the sajdah and thus also the Salaah valid?

Q: I have these doubts all the time. I know too much movement breaks salaah. I have a habit of curling my toes of both my feet, sometimes not ob purpose, sometimes consciously. I am not moving them so much. Just slightly. Will this break the salaah?

Q: Licking lips in salaah out of dryness, will it break the Salaah?

Q: While performing salaah, I felt a small particle of food in my mouth and I removed it with my finger. Is my salaah valid?

Q: To pray Salaah without making intention, to eat during Salah, to lift your feet during Salah, to lift your hands and to make an expression which makes a person looking think that you are not in Salah all make your Salah invalid. If I have done any of these actions whilst not knowing that these break Salah, do I have to do Qadha for them?

Q: During Salah, I have the habit of pulling up the sleeves of my pants/jeans, with my hands, before going into the sujood position. Does this action invalidate my Salaah?

Q: Majority of the time when I do sujood, my little toe doesn't touch the ground and perhaps the two besides it, but the big toe and one next to it  mostly do if not all do, so, is all toes touching the ground with pressure waajib/Fard, if so should one make movements in sujood or seating to ensure they touch the ground? Also I am not able to remember all the times this has happened, a lot though.