What is the difference between a physical and chemical change? (Use words reactants, products, atoms and molecules.)

Which tool is least in predicting weather

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.

Did the detergents containing enzymes work better at removing stains than those containing no enzyme? why or why not?