Achemical formula is an expression used to represent what?

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

List four observations that indicate that a chemical reaction may be taking place

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.