August 2017  Chemistry Regents #46-50

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46 Given the equation representing a reaction at equilibrium:

If an acid is defined as an H+ donor, what is the acid in the forward reaction?

(1) OH-(aq)          (3) NH3(g)

(2) H2O(ℓ)            (4) NH4+(aq)

2 Bases NH3  OH-

Acids  NH4+  and H2O (have an extra H)

forward...goes right

47 Compared to a solution with a pH value of 7, a solution with a thousand times greater hydronium ion concentration has a pH value of

(1) 10                    (3) 3

(2) 7                       (4) 4

4 1,000 has 3 zeros

pH changes by 3

Hydronium is the acid component

Acids lower pH

7-3=4

48 Which Lewis electron-dot diagram represents the bonding in potassium iodide?

1 KI is ionic

 

49 The table below shows properties of two compounds at standard pressure.

Which statement classifies the two compounds?

(1) Both compounds are ionic.

(2) Both compounds are molecular.

(3) Compound 1 is ionic, and compound 2 is molecular.

(4) Compound 1 is molecular, and compound 2 is ionic.

3 high MP and BP...ionic

conducts in water or melted...ionic

 

low MP BP is covalent ..aka molecular

50 Given two balanced equations, each representing a reaction:

Which statement compares the energy terms in these two equations?

(1) Equation 1 shows 2.2 x 105 times more energy being absorbed.

(2) Equation 2 shows 2.2 x 105 times more energy being absorbed.

(3) Equation 1 shows 2.2 x 105 times more energy being released.

(4) Equation 2 shows 2.2 x 105 times more energy being released.

 
3 4.8 E8 /2.2E3=2.2E5

both exothermic...released

 

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 55-58 Questions 59-60 Questions 61-65 Questions 66-68 Questions 69-72 Questions 73-77  Questions 78-81  Questions 82-85

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