Well for the very last sentence it would be if any of the organs shut down it could seriously hurt someone or possibly even kill them if their brain,heart or some other important organ shuts down it could kill them.
There are other minor organs where if it shuts down it wouldn't really hurt the person too much. Sorry I couldn't help you with the other ones though.
Answer:
The physical properties of matter can be measured precisely using tools, such as a triple beam balance, a graduated cylinder or beaker, a metric ruler, timing devices, or a thermometer.
Yes your equation is correct as formula for butane is c4h10 and equation is balanced
