Which of the following is a conversion from chemical energy to thermal energy? Coal is burned to boil water. Food is digested and used to regulate body temperature. Charcoal is burned in a barbeque pit. All of the above.

All of the examples stated above involve the conversion of chemical energy to thermal energy.

Explanation:

- When coal is burnt to boil water.

Coal, an allotrope of Carbon, burns exothermically (i.e. gives off heat) to give Carbon dioxide or Carbon monoxide depending on whether the combustion is complete or not.

The chemical energy stored in Coal is basically converted to thermal energy in terms of the heat used to boil water.

- Food is digested and used to regulate body temperature.

Food, containing basically chemical substances (chemical energy), undergoes digestion process in the body and this little exothermic process too gives off thermal energy to the body.

- Charcoal is burned in a barbeque pit.

Just like the coal example, charcoal is another allotrope of Carbon which burns exothermically too, to give off heat to prepare/cook the barbecue. Simple conversion of its chemical energy to thermal energy.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.