ISBS pg. 52 #25-34

25) The difference between a qualitative and quantitative tests is that a qualitative tests identify the presence or absence of a particular substance and a quantitative tests determine the amount of a particular substance present. 

26) A confirming test is a positive test that confirms that the ion is present. 

27) 

a. The reference solution's purpose was for comparison of the cloudy solutions. 

b. The distilled-water blanks purpose was to not contain any ions of interest so we could compare it to the solutions to find out if they had ions. 

28) No because there may be the slightest amount of the ion that the student cannot see with an unaided eye.

29)

a. I would let the mixture sit and see if any solid particles settled at the bottom the mixture to determine if it was a suspension . I would use the Tyndall effect to see if the mixture was a solution or colloid.

b. By allowing the mixture to sit for a few minutes, I would be able to find out if solid particles are large enough for me to see when they settled to the bottom of the mixture. In Tyndall effect if the light scattered around the mixture that means that the mixture is a colloid however if the light ran right through the mixture then it would mean it was a solution. 

30) Failing to follow the direction "shake before using" on a medicine bottle can result in you not taking the full medication because many of the particles will sink to bottom so you won't get all the ingredients in the mediation when you are taking it which can have serious risk because some people rely on medication to live. 

31) It is useful for element symbols to have international acceptance because  it allows a universal way of specifying chemicals. With element symbols it makes everything so much easier because you can learn the all the elements without memorizes a bunch of long names. 

32)

33) It is not possible to have water bee 100% chemical free or pure because atmospheric gases will always dissolve in the water to some extent. 

34) Some physical properties of water include, boiling point (100°C), freezing point (0°C), melting point(0°C), and density(1g/mL). However hydrogen and oxygen, which are water elements have different physical properties. Hydrogen's physical properties include that it is odorless, colorless, tasteless, that it is insoluble in water, and it is the lightest gas. Oxygen physical properties include that is exist in 3 forms liquid, gas, and solid and it is colorless, odorless, and tasteless.