Clicker Review - What is the correct name and bonding of...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 What is the correct name and bonding of BF 3 ? 1. boron trifluoride, covalent compound 2. boron trifluoride, ionic compound 3. boron fluoride, covalent compound 4. boron fluoride, ionic compound 0 What is the correct name and bonding of BF 3 ? Answer: Covalent molecule since all atoms are nonmetal. Does not contain polyatomic ions. 1 boron atom and 3 fluorine atoms, use prefixes, except mono of first element. Boron trifluoride
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 You have a solution of 0.10 M F and 0.10 M CO 3 2- . You add 0.10 M magnesium nitrate dropwise into the solution. K sp for MgF 2 is 7.4 x 10 –9 and for MgCO 3 is 3.5 x 10 –8 . Which of the following will precipitate first? 1. magnesium nitrate 2. magnesium carbonate 3. magnesium fluoride 4. cannot be determined from the information given 5. none of these 0 You have a solution of 0.10 M F and 0.10 M CO 3 2- . You add 0.10 M magnesium nitrate dropwise into the solution. K sp for MgF 2 is 7.4 x 10 –9 and for MgCO 3 is 3.5 x 10 –8 . Which of the following will precipitate first? Answer: K sp (MgF 2 ) = [Mg 2+ ][F - ] 2 7.4 x 10 -9 = (x)(2x) 2 x=1.2 x 10 -3 M K sp (MgCO 3 ) = [Mg 2+ ][CO 3 2- ] 3.5 x 10 -8 = (x)(x) x=1.9 x 10 -4 M x= [Mg 2+ ]=solubility of Mg salt Smaller x is less soluble - will precipitate first MgCO 3
Image of page 2
3 A comparision of 1.0 M HOCl and 0.010 M HOCl would be expected to show ____________. 1. that the percent ionization in both solutions is the same 2. that the percent ionization of 1.0 M HOCl is greater than that of 0.010 M HOCl 3. that the percent ionization of 0.010 M HOCl is greater than that of 1.0 M HOCl 4. that a comparison of the percent ionization is not possible for the two solutions 0 A comparision of 1.0 M HOCl and 0.010 M HOCl would be expected to show ____________. Answer: K a is independent of molarity/initial concentration. Less concentrated solution (more dilute) will have higher number of molecules of products to reach K a . Higher number of molecules of products means higher percentage dissociation.
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Which of the following K a values belongs to the weakest acid? 1. 1.4 x 10 -4 2. 1.8 x 10 -5 3. 4.0 x 10 -4 4. 6.2 x 10 -10 5. 6.4 x 10 -5 0 Which of the following K a values belongs to the weakest acid? Answer: Smaller K a means less dissociation weaker acid.
Image of page 4
5 It is desired to prepare a system that functions as a buffer at a pH of 5.6. Of the following systems, the best choice would be ___________________.
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern