1. Agriculture most likely began
a. 150,000 years ago in Egypt.
b. 200,000 years ago in Africa
C. 15,000 years ago in Africa
d. 10,000 years ago in the Middle East
TEST QUESTION PLEASE HELP And FAST

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n