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Intro to Chem
Chapter 1
Term | Definition |
---|---|
Matter | Anything that has mass and occupies space |
Mass | >Measurement of the amount of matter in an object |
Weight | Measurement of the gravitational force acting on the object |
Physical Change | Do not change the composition of the substance |
Chemical Change | Change in matter leads to change in composition |
Physical Properties | Properties of matter that can be observed or measured without attempting to change the composition of the matter being observed. |
Chemical Properties | Properties that matter demonstrates when attempts are made to change the matter into new substances. |
Molecule | Smallest particle of a substance that has the properties of that substance and is capable of a stable independent existence |
Atoms | Limit of chemical subdivision for matter |
Classification of molecules | Di= 2 atoms Tri= 3 atoms Poly= More than 3 Homo= Only 1 kind of atom Hetero= Contains 2 or more kinds of atoms |
Mixture | Portions of compound may vary Properties vary with composition Can be physically separated into two or more pure substances |
Pure substances | |
Homogenous Matter | Matter that has the same properties throughout the sample Solutions; Homogenous mixtures of two or more pure substances. |
Heterogeneous Matter | Matter with properties that are not the same throughout the sample. Properties of a sample depends on the location from which the sample was taken |
Elements | Pure substances that are made up of homoatomic molecules or individual atoms of the same kind. |
Compounds | Pure substances that are made up of heteroatomic molecules or individual atoms of two or different kinds. |
Metric | Base= 1 meter Larger Unit= 1 kilometer= 1000 meters Smaller Unit= 10 decimeters= 1, 100 centi= 1 meter, 1000 milli = 1 meter. |
English | Base= 1 yard Larger unit 1 mile=1760 yards Smaller unit= 3 feet= 1 yard, 36 inches = 1 yard |
Temperature scales | Fahrenheit, Celsius, Kelvin |
Scientific Scales | Celsius and Kelvin |
Fahrenheit to Celsius | C= 5/9 (F-32) |
Celsius to Fahrenheit | F= 9/5 (C) + 32 |
Kelvin to Celsius | Celsius = Kelvin- 273 |
Celsius to Kelvin | K= C+273 |