write the overall reaction and the rate expressions that correspond to the following reaction mechanism. step 1: a + b ⇋ c + d (fast, equilibrium) step 2: c + e ⟶ f (slow)

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.

Which of the following sections on the sat presents the questions in order of difficulty, from easiest to hardest, within each question type? select all that apply. math test writing and language test reading test