Which of the following is an example of a buffer?

hemogoblin

salt

metal

plasma

What us the differences between chlorine 35 and chlorine 37

Balance the below half-reaction, which takes place in acidic solution. cr2o72 - (aq) → cr3 (aq) how many electrons are transferred in the balanced half-reaction

Calculate the pH of a solution with a [H3O+] concentration of 3.0 x 10-9 M.

Suppose you have 100 grams of a radioisotope with a half-life of 100 years. How much of the isotope will you have after 200 years?

A solution is prepared by adding 25.0 g of methanol to water to make a total volume of solution of 95.4 mL. What is the weight/volume percent of this solution?

A solution is prepared by mixing 50.0 ml of 0.50 m cu (no3) 2 with 50.0 ml of 0.50 m co (no3) 2. sodium hydroxide is slowly added to the mixture. which precipitates first? [ksp (cu (oh) 2) = 2.2 * 10-20, ksp (co (oh) 2) = 1.3 * 10-15]

What does it mean when a mineral has a definite chemical composition? Select 2 choices. It always occurs in pure gorm. It always contains certain elements. It cannot form from living or once living materials.

During Trial 2, what allowed you to determine that aluminum was the limiting reactant? Check all that apply. All of the copper dissolved. The solution turned clear All of the aluminum dissolved.

49.7 mL of a solution of NaOH is needed to neutralize a solution that contains 1.86 g of H2504 in 20.00 mL of water. What is the molarity of the NaOH solution? H2SO4 + 2 NaOH - -> 2H2O + Na2SO4 1) 0.763 M 2) 0.0404 M 3) 1.13 M 4) 0.481 M 5) 0.

Which of the following is true about lonization? The ionic substances donate some of their atoms to the solvent. The covalent substance breaks apart into ions. The ionic substance breaks apart into ions.