CHM 1311 Chapter Notes - Chapter 1: Limiting Reagent, Molecular Probes, Carbon-12

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 1311
• Professor: Matthew Lafreniere

Document Summary

Macroscopic physical/chemical properties can be observed by eye. Microscopic structure of chemical substance needs magnification. Molecules: atoms combine to make small unit. Atomic hydrogen hydrogen atoms, molecular hydrogen hydrogen molecules. Chemical compound: a substance that contains more than one element. The relative amounts of the elements in a particular compound do not change. Physical properties can be measured without observing a chemical reaction. Chemical properties are displayed only during a chemical transformation. Temperature property of matter that determines direction of heat flow. Numerical magnitude, unit and precision make a quantitative measurement. Scanning tunnelling microscopy (stm) and atomic force microscopy (afm) generate images of atoms and molecules using highly miniaturized lever arms with atomically sharp tips. Next generation of molecular probes combine magnetic response imaging (mri) with the atomic force microscope. 10-12 represented by unit pico or symbol pm. Si (systeme internationale): mass (kg), length (m), time (s), temperature (k), amount (mol), electric current (a)