26. A confirming test is a test showing positive results if a particular chemical is present.
27. a. The reference solution was used in comparison to the other solution and to see a definite reaction.
b. The distilled-water blank was used to see no reaction in the solution.
28. The student should not conclude that the answer is no because iron dissolves in water so although the iron in the water may not be visible, it could be there.
29. a. For a solution, you would need to see if the mixture had the same composition throughout the liquid. For a suspension, the particles would settle and for a colloid, the particles wouldn't settle which is how you would know the difference between the three.
b. You would know which mixture is which by seeing how the particles acted in the mixtures.
30. If you don't shake a medicine bottle before using, you may not get all of the substances in the liquid because some particles in the medicine settle to the bottom. Not shaking the bottle would not evenly distribute all of the particles.
31. It is important that all element symbols have an international acceptance for scientists all over the world to understand science in other languages so they could discuss science and discover more.
32.
33. It is not possible for water to be 100% free of chemicals because there are natural chemicals that are in the air like oxygen that can't be filtered out but luckily aren't harmful to humans.
34. Some physical properties of water are boiling and freezing point (212 degrees F and 32 degrees F) and its density 1gm/1ml. However, the properties of water's elements are different. Some of hydrogens properties are it is the lightest gas and it is insoluble in water. Oxygen's physical properties are it has a pale blue color as well as it can change from a gas to a liquid at 183 degrees C.
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