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Chapter 1 Gen Science

AB
metermeasure of length
litermeasure of volume
grammeasure of mass
dependent variablevariables that would be present independently of the experiment ie time (x axis)
independent variablevariables manipulated by the experiment (y axis) what you measured
classifyinggrouping items by similarity
Purpose of an experimentTo answer the question posed
HypothesisEducated guess because you do research
Controlonly the variable tested can change
A control is necessaryto prove no other variables could have affected the result
Conclusion of an experimentAccept or reject the hypothesis and why
Ratedistance divided by time
percent of volumedivide the GRAMS substance amount by the amount of solvent
percent massdivide the ML of substance by the amount of solvent
Bunsen burnershot plates to avoid risk of burns/fires
graduated cylinderused for precise measurement (read measurement from bottom of the lens curve formed at the top)
balancemeasuring mass
forseeabilityanticipation that an event many occur
negligencefailure to exercise oridnary or reasonable care
Right to Know Lawscience teachers must be informed of potentially toxic chemicals
Carcinogenic chemicals not allowed in schoolsacrylonitriel, arsenic, asbestos, bensidine, benzene, cadmium compounds, chloroform, chromium compounds, ethylene oxide, ortho-toluidine, nickle powder mercury
Glassware carerinse with didistilled water
Solutions made withdistilled water
Chemical storagedry area according to reactibility
Acidslocked away separately
Fire departmenthelp with safe disposal of chemicals
chromatographyseparates substances such as plant pigments, molecules move quickly if small and slowly if large
spectrophotometryuses percent of light absorbed to measure color change
Centrifugationspinning substances at high speed. Denser settles to the bottom (separate blood into blood cells and plasma)
electrophoresisuses electrical charges of molecules to separate them by size. DNA or proteins are pulled through a gel to either the positive or negative end of a gel box
Computer technologycollection and interpretation of data. Computer images, shared data through internet, MRI, CT
Satellitescomuunication, navigational abilities, sonar uses sound to locate objects,
Seismographsrecord vibrations in the earth and allow us to measure earthquake activity

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