CH 302 HW 2 - wei(cyw224 H02 Solutions Mccord(52450 This...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
wei (cyw224) – H02: Solutions – Mccord – (52450) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Dissociation of a solid is aided by 1. strong interaction between solvent molecules. 2. strong binding in the solid and weak solvent-solute interaction. 3. weak binding of species in the solid and strong interactions between the solvent and solute. correct 4. None of these is correct. Explanation: Weak intermolecular forces in the solute facilitate separation of its particles and strong attractive forces between solute and solvent facilitate dissociation of a solid. 002 10.0 points Some distilled water is added to an empty beaker. A gram of copper(II) nitrate is added to the beaker with stirring. After a few min- utes, what is in the beaker? 1. solid copper(II) nitrate and water 2. nitrogen gas, copper atoms, electrons, and water 3. a sticky material of copper hydronitrite 4. copper ions, nitrate ions, and water cor- rect 5. solid copper, nitrate ions, and water Explanation: All nitrates are soluble in water, so the cop- per(II) nitrate dissolves. Soluble ionic com- pounds are strong electrolytes, so the cop- per(II) nitrate also dissociates into its cation and anion parts: Cu + 2 and NO - 3 . 003 10.0 points Both ammonia and phosphine (PH 3 ) are sol- uble in water. Which is least soluble and why? 1. phosphine; the P - H bonds are so strong that they cannot break to enable phosphine to hydrogen-bond with water. 2. phosphine; it does not form hydrogen bonds with water molecules. correct 3. ammonia; it is too small to be hydrated by water molecules. 4. ammonia; the N - H bonds are so strong that they cannot break to enable the ammonia to hydrogen-bond with water.
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
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