June 2023  Chemistry Regents #41-45

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-52 Questions 53-54 Questions 55-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-78 Questions 79-81 Questions 82-85

 

 

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41 Based on Table G, which compound is less soluble in water as the temperature increases from 0oC to 100oC?

            1. KNO3

            2. NH3

            3. KClO3

            4. NH4Cl

 2   this is the only compound that has a negative slope on that table
42 How many moles of KI are needed to make a 0.50 L of a 0.20 M aqueous solution?

            1. 0.10 mol

            2. 0.25 mol

            3. 0.40 mol

            4. 0.70 mol

 1   Table S has the equation

0.20 M = x mol /0.50 L

X= 0.10 mol
43 A solution is prepared using 9.80 grams of NaHCO3 in enough water to make 1500. grams of total solution. What is the concentration of the solution expressed in parts per million?

            1. 6.49 x 10-3 ppm

            2. 6.53 x 10-3 ppm

            3. 6.49 x 103 ppm

            4. 6.53 x 103 ppm

 4   Table S has the equation

9.80g / 1500.g   x 1,000,000

DO NOT ADD 9.80 and 1500 as it is already accounted for in the solution

 

44 A potential energy diagram from the chemical reaction is given below. Each interval on the potential energy axis represents 100. kilojoules of potential energy.

 

Image -endothermic PE diagram

What can be concluded from the diagram?

            1. The reaction is endothermic and the heat of reaction is -200kJ.

            2. The reaction is endothermic and the heat of reaction is +200kJ.

            3. The reaction is exothermic and the heat of reaction is -200kJ.

            4. The reaction is exothermic and the heat of reaction is +200kJ.

 

 

 2   The PE diagram goes up.  Endothermic.

On the bottom of Table I, minus sign indicates an exothermic reactions. So endo is a +200.
45 Given the formula representing a compound:

IB Chemistry standard level: Organic chemistry

            1. 1,1-dibromopentane

            2. 2,2-dibromopentane

            3. 1,2-dibromopentane

            4. 4,5-dibromopentane

 3    5 carbons - pentane

2 Bromines... dibromo

locations carbon 1 and 2

1,2-dibromopentane

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-52 Questions 53-54 Questions 55-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-69 Questions 70-73 Questions 74-78 Questions 79-81 Questions 82-85

 

 

 

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