Question

5. Why does benzene float on water?

6. What is the meaning of a boiling point? Provide a scientific definition.

7. What does anion mean?

8. The insoluble compound (the white ppt) resulted from testing for SO₄^-2 ion is -------------------------

9. The gas bubbles that are produced when adding HCl to a solution that contains CO₃^-2 represents the formation of ______________.           

10. When a solution of Cl^- ion is mixed with a solution of AgNO₃ (in acidic environment), what is the observation?

11. You have a solution of unknown anion, you added 10 drops of this solution to a test tube. Then, you added 2 drops of HNO₃ and 2 drops of AgNO₃. You observed white ppt. What is the anion in the solution?

12. To test for CO₃^-2 , we use _____________________

13. You have 3 test tubes that contain the same anion. You want to make sure which anion is there. You performed a test in each test tube as the following:
                - You added AgNO₃ but you did not see anything
                - you added BaCl₂ but you did not see anything
                  - you added HCl and you saw bubbles.

Which anion is in the test tubes?

14. You have two test tubes, one should contain Cl^- ion and one should contain SO₄^-2. You want to do one test (add one reagent) in order to know which one is Cl^- ion and which one is SO₄^-2 ion. What reagent would you choose? Please explain

15. We have one test tube that contain unknown anion. We added AgNO₃ to the sample and the solution formed no ppt. We then tried to add BaCl₂ to a fresh sample and it formed no ppt neither. What anions would you expect to be in the sample? Explain the test that you would perform to confirm your expectation.
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Answer 1

Den on wataY COi ré exexted by su, a^ Antom (42) 2 21 CT) (a-4)