18.20 g Mass of crucible NaHco, hdorr heaiso 19.715E Mass of crucible Nanco, can

Question

18.20 g Mass of crucible NaHco, hdorr heaiso 19.715E Mass of crucible Nanco, caner hearing 19.202E 0.5 12. Which one gives the least accurate velanoe measurer b, graduate cylinder 13. The difference in the mass or the baking soda tefore heating and amer heating comesponds to which of the following? (a) mass of carbon dioxide (b) of sodium hydrogen carbonate do mass of water vapor (e) mass of water vapor and carbon dioside gas 4, Which of the following information about a chemical can be found on an MSDs Health hazards 15. In performing a gravimetric analysis esperiment of a salt mixture the stadent was instructed to weigh a cruicible, add the sample reweigh it, then beat the missate to constant weight when she begins the experiment, she notices that the sides of the cruicible is wet with heads of the unknown liquid from its use in previous lab period. She proceeds to carry out the experiment anyway. Provided that she does everything else comectly, lhe yield of product would be: correct d. could either be too high or too low 16. Which of the following types of chemicals are considered to be health hazards? c, Sensitizers d. All of the above 17. A beaker contains 100 ml. of sale water. If 100 ml. of distilled water added to the beaker. the number of moles of NaCI a) increases by 500

Explanation / Answer

Ans 12

For perfect volume measurements , the vessel should have the graduations in which the substance is stored

As the beaker does not have any graduations on its surface it's the least accurate method to calculate volume, the rest other methods are better

So correct option is A

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