What are two techniques used to measure the pH of a solution. Classify pH values of 9.1, 1.2, and 5.7 as basic, acidic, or very acidic.
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List the two type of transporst that the cell in orde to transport molecules acroos the membrane

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)