chem midterm
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Steps of the scientific method | 1.state a problem
2.gather information
3.form a hypothesis
4.perform an experiment
5. analyze data
6.form conclusion
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| the triple beam balance is used to measure __________ | mass
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| a graduated cylinder is used to measure__________ | liquid volume
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| a ruler is used to measure ______________ | length
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| temperature at which water boils and freezes | 100(degrees Celsius) 0(degrees celsius)
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| used to measure temperature | thermometer
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| basic unit of mass | kg(kilogram)
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| basic unit of liquid volume | L(liter)
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| basic unit of solid volume | cm3(cubic centimeter)
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| basic unit of length | m(meter)
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| basic unit of time | s(second)
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| each line on a ruler represents ________________ | a millimeter
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| mass | measure of matter in an object
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| length | distance between two points
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| volume | amount of space an object takes up
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| control | standard to which test results can be compared
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| constant | variable that dos not change when other variables do
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| independent variable | changed to determine how it will affect the dependent variable
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| a factor that changes in an experiment from manipulation of the independent variable is the _________________ | dependent variable
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| a testable prediction | hypothesis
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| substances are either _______ or _________ | elements or compounds
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| matter is classified as either ____ or _______ | pure substances or mixtures
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| when two or more substances are combined so each substance can be separated by physical means the result is a ___________ | mixture
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| pure substances that are made of more than one element | compunds
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| a solution | one substance dissolved in another
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| a suspension | a type of heterogeneous mixture whose particles settle over time and can be separated from the mixture by filtration
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| if the density of an object is less than the density of the fluid displaced by the object , the object will ________ | float
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| the melting point is the same temperature as the _________ | freezing point
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| phase change from liquid to gas | vaporization
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| phase change from gas to liquid | condensation
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| matter that has a definite volume but no definite shape | liquid
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| matter that has a definite volume and a definite shape | solid
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| matter that has no definite shape or volume | gas
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| matter whose particles move faster and farther apart | gas
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| discovered the proton using the gold foil experiment | rutherford
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| discovered the neutron using the cathode ray | chadwick
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| discovered the elctron | j.j thomson
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| said that matter was made out of small round particles | dalton
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| said that all atoms of an element were identical | dalton
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| in a nuetral atom _________ equals _______ | protons equals elctrons
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| valence electrons are the electron found in the _______________ | outer shell
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| the region around the nucleus occupied by the electron | electron cloud
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| elements that lay along the stair - step line of the periodic table | metalloids
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| nonmetals tend to ____ valence electrons | gain
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| particles that make up the atomic mass | protons and nuetrons
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| charge of a proton | +1
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| charge of a nuetron | 0
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| charge of an electron | -1
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| metals ______ valence electrons | lose
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| group 1 | alkali metals
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| group 2 | alkaline earth metals
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| group 3-12 | transition metals
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| group 13 | boron group
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| group 14 | carbon group
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| group 15 | nitrogen group
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| group 16 | oxygen group
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| group 17 | halogen group
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| group 18 | noble gases
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| a bond between a metal and metal | metallic bond
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| bond between a metal and nonmetal | ionic
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| bond between nonmetal and nonmetal | covalent
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| bond when an equal exchange of electrons is shared | ionic
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| bond when atoms share electrons | covalent
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| polyatomic ion | covalently bonded compound of nonmetals that has a charge
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| an ion | charged atom
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| unit for density | g/mL g/cm3
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