What does a chemical reaction always produce?

A) A different phase of matter (solid from liquid, gas from liquid, etc.)

B) A physical change

C) A chemical change

D) Heat

Draw the lewis dot structure for each of the following polyatomic ions

Which one of the following substances would be the most soluble in ccl4? na2so4 h2o ch3ch2ch2ch2oh c4h10 hi

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.