Which of the following examples involves an exothermic change. a. ice melting on a warm day

b. water boiling in a tea kettle

c. gaseous water particles coming together to form fog

d. air in a bicycle tire gaining pressure after a long ride

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges