Plz help, I have 20 minutes

What is the value of keq for the reaction expressed in scientific notation?

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.