HELP PLS I NEED HELP ASAP Chemical reactions occur around us every day. Combustion of hydrocarbons releases the carbon stored in fossil fuels (e. g. coal, oil, natural gases) into the atmosphere as carbon dioxide gas. Which of the following equations represent this process?

A. C4H10+ O2→CO2+ H2O

B. CO2+ H2O →C6H12O6+ O2

C. CaCO3+ HNO3→Ca(NO3)2+ H2O + CO2

D. NaHCO3+ HC2H3O2→NaC2H3O2+ H2O + CO2

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.