How many moles of ammonia would be required to react exactly with 0.158 moles of copper (||) oxide in the following chemical reaction? 2NH3(g) + 3CuO(s) ---> 3Cu(s) + N2(g) + 3H2O(g)

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

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.