9. What is a two point calibration method? In your answer, include the term "buffer" and the pH of the two solutions used to calibrate the probe.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

d. changes in climate and historical records

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