Someone wanna do this or at least explain, how each question is done? because i'm really confuse how to use cos, sin, and tan. you : )

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!