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Honors Chemistry Ch1
Question | Answer |
---|---|
Chemistry | study of composition, structure, and properties of matter. Also the process that matter undergoes and the E changes that occur |
6 main branches of chemistry | *organic chemistry *inorganic chemistry *physical chemistry *analytical chemistry *biochemistry *Theatrical chemistry |
organic chemistry | the study of most carbon containing compounds |
oragnometallics | metal that is attached to an organic compound. *metal + organic compound |
inorganic chemistry | the study of non-organic substances many of which are oraganometallics |
physical chemistry | the study of the properties and changes of matter & their relation to energy |
analytical chemistry | the identification of the components & composition of materials (matter) |
Biochemistry | the study of substances & processes occurring in living things |
Theoretical Chemistry | the use of mathematics and computers to understand the principles behind observed chemical behavior. |
chemical | any substance that has a definite composition |
definite composition | pure substance |
basic research | carried out for the sake of gaining and increasing knowledge |
applied research | used to solve problems |
technological development | typically involves the production and use of products that improve quality of life. |
matter | anything that has mass and volume |
volume | the amount of 3D space an object occupies |
mass | a measure of the amount of matter |
atom | the smallest unit of an element that maintains the chemical identity of that element |
element | * a pure substance that cannot be broken down into simple substances *made of 1 type of atom |
compound | * substance that can be broken down * made of 2 or more atoms *chemically bonded |
extensive properties | depends on the amount of matter that is present |
extensive properties examples | volume, mass, and the amount of energy in a substance |
intensive properties | depends on the type of matter present |
intensive properties examples | boiling point, melting point, density, ability to conduct electricity, and the ability to transfer energy as heat |
electrolysis of water | breaking down H20 into the original components. H2 + O2 |
physical properties | a characteristic that can be observed or measured without changing the identity |
physical properties examples | melting and boiling point |
physical changes | a change in a substance that does not involve a change in identity of the substance |
physical changes: examples | grinding, cutting, melting, boiling |
Change of state | a physical change of a substance from one state to another |
liquid | definite Volume, indefinite shape |
solid | definite shape and definite volume |
gas | Indefinite volume and indefinite shape |
plasma | high temperature physical state where atoms lose most of their electrons |
chemical properties | relates to substances ability to undergo changes that transform it into a new substance |
chemical change | when one or more substances are converted into a new substance..... this changes the identity of the substance! |
chemical change: examples | flammability and toxicity |
reactants | the substances that react in chemical change |
product | the substance that is formed by the chemical change |
energy in changes can be found in the form of | light or heat |
mixture | *blend of 2 or more kinds of matter *can usually be separated *mixed together physically |
homogeneous mixture | solutions that are uniform in composition |
what does uniform in composition mean | molecules spread throughout a mixture equally |
heterogeneous mixture | mixtures that are NOT uniform in composition |
pure substance | fixed composition, and is an element or compound |
vertical columns on the periodic table | a group or family |
which column contains elements with similar properties | Groups/vertical |
horizontal columns | periods |
metals definition | an element that is a good conductor of heat and electricity |
metals: properties other than conductibility | most are solid at room temp. , malleable and ductile |
malleable definition | can be hammered into sheets |
ductile definition | can be drawn into fine wires |
metals: examples | gold, copper, aluminum |
nonmetals definition | an element that is a poor electrical and heat conductor |
nonmetals: properties other than conductibility | many are gases and solids are brittle |
nonmetals: examples | carbon, sulfur, phosphorus, iodine |
metalloids definition | an element that has some qualities and properties of metals and some of nonmetals |
metalloids: properties | semiconductors of heat and electricity, and all are solids at room temp. |
noble gases definition | elements that are in group 18 of the periodic table |
noble gases are generally reactive or nonreactive? | nonreactive |
noble gases are the only elements that can what? | be found in their pure form in the nature |