CHEM 131 Chapter Notes - Chapter 1: Combustibility And Flammability, Kilogram, Boiling Point

• School: University of Maryland
• Department: Chemistry and Biochemistry
• Course: CHEM 131
• Professor: Keller

Document Summary

Solid: molecules held tightly together, only wiggle a little. Liquid: molecules are packed closely, but still moving at high speeds. Gas: molecules are far apart and moving at high speeds. Element: substances that cannot be decomposed into simpler substances. Compound: substances composed of two or more elements. Heterogeneous mixture: do not have the same composition, properties, and appearance through out. (rocks, wood) Molecule: two or more atoms are joined in specific shapes. Physical property: can be observed without changing the identity and composition of the substance. (color, density, melting point, boiling point) Chemical property: describe the way a substance may change, or react, to form another substance. (flammability) Intensive property: does not depend on the amount of sample being examined. (temperature and melting point) Extensive property: depend on the amount of the sample. (mass, volume) Celsius to kelvin: c= 5/9 ( f 32) or f= 9/5 ( c) + 32.