chem notes

Essay text:

Digits other than zero are always significant. 96L 61.4g 4.512g (3sf) (3sf) (4sf) 2. Zeros to the right to the decimal are significant when they have a number preceding them that is not zero. 4.72 4.7200 82.0 (3sf) (4sf) (3sf) 3. Zeros between two other numbers that are not zero are significant. 4. Find number with least number of significant figures report answer with that number of significant figure. Hazard Sign: Health- Blue Flammability- Red Reactivity- Yellow White- Special Hazard Info Safety Rules: ? No eating, drinking, or chewing gum ? Follow directions; ask for clarification ? Do not perform an unauthorized experiment ? Keep aisles clear ? Goggles and smock on all times ? Dispose chemicals properly ? Tie back long hair; no loose, baggy clothes and sandals ? Report all accidents ? Treat all chemicals as dangerous ? Stand up always; never sit unless instructed ? Never smell chemicals directly ? Do not place hands near mouth or eyes ? Turn off gas if burner goes out ? Abide any verbal requests by teacher Parts of an experiment: Dependant Variable- -This is the response you are measuring Independent Variable- -Unaffected Control- -What you use as comparison Constants- -Never change Sources of error: ? Procedural- ? Miss step ? Incorrect assumption ? Incorrect measuring ? Systematic- ? Consistency ? Random- ? Source of error due to the estimation of last significant figure ? More trials the less random errors Formula for % of error: Experimental data ? Theoretical data x 100 Theoretical data Scientific method: I...