25. Qualitative tests identify the presence of an element or substance while quantitative tell you the amount of an element or substance. A truly extensive lab includes both, but some do not need it such as in the Water Test Lab.
26. A confirming test is a positive test that confirms the presence of an element or substance.
27. a)The reference solution is to show you what should happen if the element or ion is present.b) the distilled-water blank shows you what should happen if the ion or element is not present.
28. The student should conclude that the presence is not shown and there was not solids or precipitants. THe student cannot rule out iron completely because this is not a quantitate test.
29. a)To rule out a suspension or solution i would filter the substance through a coffee filter. Then i would also use the Tyndall effect. b)The Filter would tell me whether the substance was a suspension if it changed and would tell me if it was a solution or a colloid if it didn't. The Tyndall effect could then tell me if it was a solution or a colloid by being positive or negative.
30. You could only get the top layer of the medicine which may not have that actual medicine needed or even something that could do harm to you.
31. Elements are universal and have to be accepted all around or else science would be too complicated to convert all the time for other countries in medicine and other scientific fields.
32. See Drawing
33. No. It is physically impossible to have 100% pure chemical free water. Even distilled water cannot get rid of gases and impurities that water has.
34. Water has high surface tension because it is a polar molecule which means it is both negatively and positively charged. Hydrogen is just a negatively charged ion and oxygen is also a negatively charged ion. Hydrogen and Oxygen also can not be a liquid, solid and gas like water can.
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