PLEASE HURRY Which imaging technique uses radiation that is emitted from the material being imaged? O X-ray radiography O MRI O CT scan sonography​

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

The appropriate concentration for an iodine sanitizer is

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5