Which of the following statements is true of enzymes ???

A. they change shape after a reaction

B. They don’t provide an active site for substrates to bind in a reaction

C. They’re unusable after a reaction

D. They act on a specific type of substrate in a reaction

Which of these conditions most likely produces an unstable isotope?

The movement of tectonic plates and in two locations is described below: location a: tectonic played push together location b: tectonic plates push apart

Using this reversible reaction, answer the questions below: n2o4 2no2 (colorless) (reddish-brown) -as the temperature increased, what happened to the n2o4 concentration? -was the formation of reactants or products favored by the addition of heat? -which reaction is exothermic? right to left or left to right? -if the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct? n2o4 2no2 + 14 kcal n2o4 2no2, hr = +14 kcal n2o4 + 14 kcal 2no2 n2o4 2no2, hr = -14 kcal