25. Qualitative tests: Tests that identify the presence or absence of a particular substance in a sample.
Quantitative tests: They determine the amount of a specific substance present in a sample.
26. A confirming test is a laboratory test giving a positive result if a particular chemical species is present.
27. a. The purpose of using the reference solution was because it is a solution of know composition used as comparison, and it is known to have the sought ion.
b. The purpose of using the distilled water blank was because it is known to not contain any ions of interest.
28. No, the student should not conclude that because some ions are too small and won't show a reaction.
29. a. I would use the Tyndall effect to see if particles are showing when I shine a light through it, and I would observe the unknown mixture to see if there a big solids that can be filtered out to decide whether the mixture is a solution, suspension, or a colloid.
b. Using the Tyndall effect would help me understand if the mixture is a colloid or solution and observing the mixture, would help me understand if the mixture is a suspension.
30. The possible risks are that in medicine, you would not consume the whole medicine, which could have serious affects.
31. It is useful for element symbols to have international acceptance because anyone can understand the element and there would be no confusion.
32.
33. It isn't possible for water to be 100% "chemical free" because the atmospheric gases nitrogen, oxygen, and carbon dioxide will always dissolve in the water to some extent.
34. H2O is liquid water. It is composed of 2 Hydrogen atoms and 1 Oxygen atom. When the atoms combined they make liquid at room temperature.
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