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CHE-125 Ch. 1
Question | Answer |
---|---|
Matter | anything that has mass and occupies space |
Scientific Method | the systematic process of observation, hypothesis, and expierimentation used to expand and refine a body of knowledge. |
Solid | a substance with definte shape and volume |
Liquid | substance with definte volume but indefinte shape(assumes shape of its container) |
Gas | substance with niether definte volume or shape |
States of Matter | the physical state of a substance (solid/liquid/gas) |
Change of State | conversion of a substance from one state to another |
Pure Substance | uniform chemical composition throughout |
Mixture | a blend of two or more substances, each of which retains its chemcial idenity. |
Element | fundamental substance which that connot be broken down chemically into any simpler substance |
Chemical Compound | a pure substance that can be broken down into simpler substances by chemical reactiosn |
Reactants | A starting substance that undergoes a change during a chemical reaction |
Product | the substance formed as a reslt of a chemical reaction |
Chemical Reaction | A process in which the idenity and compisition of one or more substances are changed |
Chemcial Formula | A notation for a chemical compound using element symbols and subscripts to show how many atoms of each element are present |
Metal | A malleable element with a lustrous appearence that is a good conductor of heat and electricity. Solid @ room temp., Ductile. |
The only metallic element that is liquid at room temp is? | Mercury (Hg) |
How many elements are on the periodic table? | 117 |
Amount of elements that occur naturally? | 90 |
Exanmples of Physical Change? | Phase changes, dissolving sugar in water, breaing glass, nickel sticking to magnet. |
Examples of Chemical Change? | Milk Souring, Rusting, burning, exploding of nitroglycerin, ignition of matches. |
Examples of Mixtures? | Seawater, Mayonnaise, Rocks, Blood, Toothpaste, fog |
Examples of Compounds? | Water, Sugar, Sodium Chloride, Gaseous Ammonia, steam+water, Sodium Bicarbonate (Baking Soda) |
Non-metals | Many are exotic colored. Bad conducters. 11 are gases @ room temp, 5 are brittle solids, and Bromine is the only liquid nonmetal. |
Metalloids | Located along staircase (except Alumminum Al & Polonium Po). Solids, Dull, semi conductors. |