Just need this answered i understand it just need to study for something else

How have the greenhouse gasses increased from the year 2000 to 2018

How many moles of oxygen gas are produced from the decomposition of six moles of potassium

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