2 example if 28 g n 2g reacts with o 2g to form 54 g

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
2. Example: If 2.8 g N 2(g) reacts with O 2(g) to form 5.4 g N 2 O 5(g) , how many grams of O 2 reacted? B. A “law” is a (chemical) principle that has never been experimentally determined to be false. C. In the “Scientific Method”: Observation leads to hypothesis and hypothesis leads to experiment and experiment lads to theory and more experiment and observation may cause the theory to eventually be stated as a law. III. Changes in Matter. A. In a physical change, no new chemical bonds are formed and no chemical bonds are broken. The molecular arrangement of atoms or molecules is unchanged. The intermolecular attractions change. 1
Image of page 1

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

View Full Document Right Arrow Icon
Chapter 1 Notes-Chemistry and Measurement Fall 2101 Ebbing and Gammon 9 th Edition Chem 0110 H 2 O (s) H 2 O ( ) H 2 O (g) 1. All changes of state are physical changes. 2. Energy may be released (heat = -(negative)) or energy may be absorbed (heat = + (positive)). a) remains intact. 44 kJ + 18 g H 2 O ( ) 18 g H 2 O (g) ΔH vap = 44.0 kJ/mol (endothermic) 58 g C 3 H 6 O(g) 58 g C 3 H 6 O ( ) + 29.1 kJ ΔH cond = 29.1 kJ (exothermic) B. In a chemical change, new substances form; chemical bonds rearrange N 2(g) + 2 O 2(g) N 2 O 4(g) ΔH R = +11.1 kJ P 4(s) + 5 O 2(g) P 4 O 10(s) ΔH R = -2984 kJ 1. Note: N N + 2 O O N N O O O O IV. Physical Properties include A. Boiling point, melting point, vapor pressure, and are generally associated with physical change.
Image of page 2
Image of page 3
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