Which equation represents the pythagorean theorem, which can be used to find the magnitude of resultant vectors? r = a + b r = a x b r2 = a2 x b2 r2 = a2 + b2

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

8. how much enthalpy/heat is transferred when 0.5113gof ammonia (nh3) reacts with excess oxygen according| to the following equation: 4nh3 +502 - 4n0+ 6h20ah = -905.4j