Exam Paper

In Experiment B the limiting reactant was determined to be CaCl2 when two drops of the test reagent 0.5 M CaCl2 was added to the supernatant liquid in test tube 1, and a precipitate formed. Since there was a reaction, there was C2O42- in excess and Ca2+ is the limiting reactant in the original salt mixture present in test tube 1 . This was further confirmed when two drops of the test reagent .05M K2C2O4 was added to the supernatant liquid in test tube 2. There was no precipitate because Ca2+ was not present since it was the limiting reactant and instead C2O42- was in excess.

Bleach: when combined with BTB this cleaner changed orange, indicating that the cleaner has an acidic ph.

between the unknown cation and chlorine (Cl - ) was also formed from the addition of HCl. HCl was

In reference to the analysis of anions, Table 1 shows that a precipitate was formed when our unknown was combined with HNO3 and AgNO3, thus indicating the presence of a chloride ion. Because our unknown did not form a precipitate due to HCl and BaCl2, separate, effervesce, or smell, we concluded that neither sulfate, nitrate, carbonate nor

5. Was there any evidence that some of the copper (II) chloride was left in the beaker? Explain.

12. Write the balanced chemical reaction of the product of the reaction described above (problem 11) with NaOH. Is the product of this reaction soluble in aqueous solution?

Write a balanced chemical equation for the reaction of carbon dioxide with limewater. The formula for the active substance in limewater is on the pipet, and the products of the reaction are calcium carbonate and water.

History suggests that the overwhelming majority of human beings have had to choose between either tyranny or anarchy

b. Coal hypothesis = If the activated carbon is added to the water, it will make the water more acidic.

4. NaOH, sodium hydroxide is a strong base. It reacts with HCl and forms NaCl and H2O.

In the scenario described in problem 7, what is the amount (in moles) of excess

To study the nature of ionic reactions, write balanced equations, and write net ionic equations for precipitation reactions.

c. All the formulas of the oxides formed by the alkaline earth metals and lead

In this case study, the main focus of our interest is to evaluate the non traditional incentive system. But before going into the detail of Non-traditional incentive system, let us summarize the case study first.

Part A.1. Sodium metal is also readily oxidized by oxygen. If the product of the reaction were dissolved in water, what would be the color of the litmus for a litmus test? Explain. What is the product?