express the chemical reactions between hydrogen and oxygen element for the fromation of water in word equation and chemical equation​

4. absorption has the highest risk of overdose due to increased potency. a. rectal b. oral c. transdermal d. intranasal

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

At element makes up all organic compounds?