Homework #7 Semester 1

1SBS #25-34 pg. 51-52

25. Qualitative Tests identify the presence or absence of a particular substance in a sample, while, in contrast, Quantitative Tests determine the amount of a specific substance present in a sample. 

26. Confirming Tests are positive tests that confirm that the ion in question is present.

27. A. The Reference Solution is known of composition and it's used as a comparison

      B. The Distilled-Water Blank is known to not     contain any ion of interest.

28. No the student should not because other mixtures could have been mixed into his solution (the student may not have used a clean pipet or cleaned up his/her last solutions, etc.)

29. A. I would see if the particles were microscopic, molecular sized, or large and visible.

      B. See if the particles were uniform/standard or not.

30. The particles are at the bottom of the bottle so without shaking it, the medicine would not have the same effect as it would if it was shaken.

31. It is useful so that all the symbols throughout the globe will be uniform/standard without any confusion.

32.

33. No. It would be too expensive to have absolutely pure, clean, chemical free water.

34. Water (H2O) is composed of two elements (hydrogen and oxygen). At a normal room temperature, water is physically a liquid, while hydrogen and oxygen are both gases.