NATS 1840 Lecture Notes - Endothermic Process, Covalent Bond, Nuclear Reaction
20 Nov 2012
School
Department
Course
Professor
Document Summary
Science, technology and the environment (sc nats 1840a) . Readings 3. 3, 3. 5, 3. 6, appendix 3, 3. 4, 3. 7 activity #1 on kit. Matter, chemical reactions and nuclear reactions, scientific notation. Example: carbon = c, needs 4 extra electrons. Electrons are shared in a covalent bond: . c. <= c has 4 dots around it and the two middle ones are connected, carbon would like it better if there are 4 h"s and have 8 electrons => ch4 (methane) Covalent bonds are weaker than ionic ones. Processes in which nuclei, atoms, or molecules interact in a manner which changes how they are bound. If products are more tightly bound overall compared to the ingredients, reaction is exothermic energy is released (from the ingredients) in the reaction. If products are less tightly bound than the ingredients, reaction is endothermic energy must be added to the ingredients for the reaction to occur. Only the electron clouds participate nuclei are unaffected and remain intact.
