All plastics have carbon and hydrogen. Some can have oxygen, chlorine, nitrogen, sulfur and the list goes on. It depends on the plastic. Colouring agents are added, UV filters are added and "plasticisers" are added...
The simplest plastic is polythene which is food wrap and consists of only hydrogen and carbon.
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Plastic can release toxic chemicals, such as phthalates and bisphenol A (BPA), especially when exposed to heat or sunlight. These chemicals can leach out of the plastic and enter the environment or food and beverages stored in the plastic containers. It's important to use plastic products that are labeled as BPA-free and to avoid heating food in plastic containers to minimize exposure to these harmful chemicals.
These chemical reactions are named exothermic.
Yes, it is possible: thermal decomposition and electrolysis.
"Give off CO2" means releasing carbon dioxide into the air as a byproduct of a chemical reaction or biological process.
Cyanide can give off a bitter almond smell, but doesn't always give off an odor, and not everyone can detect this odor.
cylicone :)