Explain why pH = pKa at one half the volume need to reach the equivalence point for the titration of a weak acid with a strong base.

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

My dog made become frightened and cover when he hears loud thunder this is an example of a reaction to what kind of stimuli a. chemicalsb. lightc. touchd. sound