in part A the mass of empty tray was 2.78g and the mass of tray with stopper was 38.82 the mass of the stopper is 38.82_2.78=36.04 we repeat this thing again with second type of observation and we get 39.2678_2.6409=36.6269 and the we did find the average in part D we cut the glass and we use the bunse burner to make it smooth that was about 15 min in Part E when the water was boiling poiling chips were moving a lot and there was so much steam and then the sodium chloride became powder and a little bit salt in part F when we mix the sodium iodid and the lead nitrate the mixture became yellow and when we did the filtration the yellow stay on the filter paper but all the water came down plzzz i need three paragraphs conculsion and i need the answers for the last pictures
Laurie LeBlanc & Rosana Pedroza Laboratory Techniques Inaccurate experimental results are often a consequence of poor lab techniques. The knowledge anc good lab techniques wil provide an understanding of experimental procedures and assure good result each laboratory period. They will also prevent loss of product, chemical contamination, spilled chem and help the student to minimize waste. of laboratory techniques. Students will investigare the common laboratory equipment and use it and n this lab, students will become acquainted with use and precision of balances in a metric glassware. The Bunsen burner will be used to fire-polish glass rad and the techniques of evap ish between physical changes and chemical changes of matter. be used to distingu unknown precipitate will also be identified as part af the filtration. A: Mass Determination The accurate determination of mass is one of the most fundamental techniques for chemistry studen Mass is a direct measure of the amount of matter in a sample of substance, that is, a direct indication the number of atoms o molecules the sample contains There are several types of balances used in a typical chemistry laboratory, These balances differ their construction, appearance, operation and in the level of precision they provide in mass measurer In this laboratory, a top-loading balance will be used that has a precision of 0.01 grams (gl as well a analytical balance with a precision af 0.0001 g (see Figure 1.11 Note the use of the word "balance. A balance (such as we're using in s lab) measures mass by balar the sample of interest against a known (intermal mass, effectively cancelling out the farce of gravity. A on the ocher hand, measures eight" (che force of gravity along with massl. lt is a balance that is rout used in the chemistry lab, nat a scale.
