Select the one that is false and please answer all questions glueose and 0.5M fr

Question

Select the one that is false and please answer all questions glueose and 0.5M fructose. Chemical Principles III Kw, the autoionization constant of water, remains constant regardless or environmental conditions. a. b. Basic solutions have a lower pOH than neutral solutions The density of a substance refers to the amount of that substance that exists in a given volume of that substance. c. Chemical Principles IV a. When making 200 mL of a solution, it is acceptable to add the necessary amount b. While we refer to % (w/v) as "percent solution", this is more a measure of c.Elements on the right side of the periodic table have more valence electrons than of solute to 200 mL of the solvent. concentration those to their left. Chemical Principles V One must always specify the percent solution they are referring to as there are multiple variations. When diluting a given volume of stock solution, the number of moles of solute before dilution always equals the number of moles of solute after dilution. A solution with a pH of 12 has a higher [H'] than a solution with a solution with a pOH of 12 a. c.

Explanation / Answer

Chemical principle III- False statement - a) The autoionisation constant of water changes with change in temperature.

Chemical principle IV- False statement- a) If we add any amount of solute in 200 ml of solvent its volume and weight gradually increases, it will not remain 200ml after the formation of solution, it will be more. To make 200 ml solution we need to add the solute and the solvent such a way that the final volume remains 200 ml.

Chemical principle V- False statement c) pH means the negetive log of concentration

pH 12 will have a H+ concentration of 10-12, and so OH- concentration 10-2

pOH 12 will have a OH- concentration of 10-12 and H+ concentration of 10-2

So a solution of pH 12 will have a lower H+ concentration than a solution of pOH 12. (10-2>10-12)

9. Tools and techniques: False a) To measure if an instrument is accurate its readings need to be compared with a standard and measure the error. The instrument which shows the least error in consecutive readings is more accurate.

15. Experimental Design: False b) A placebo group is an inactive substance given to a subject than the actual experimental drug or treatment. This should produce a negative result.'

18 Diffusion- False a) Diffusion in a solution is movement of solute from higher concentration gradient towards lower concentration gradient, not solvent.

20. Diffusion III- False c) Facilitated transport is different than free diffusion

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