June 2024  Chemistry Regents #46-50

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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 53-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-81 Questions 82-85 

  

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Questions

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Explanations
46. Which solution is the best conductor of electricity?

1.   0.0010 M CaCl2(aq)

2.   0.010 M CaCl2(aq)

3.   0.10 M CaCl2(aq)

4.    1.0 M CaCl2(aq)

 4   highest concentrations of ions

so, 1.0M
47. Given the incomplete equation representing a neutralization reaction:

     Sr(OH)2  +  2HNO3 --> X  + 2 H2O

What is the formula of the missing product X?

1 SrO                   3  Sr(NO2)2

2 SrO2                       4  Sr(NO3)2

 4   conservation of mass question

 the 2H and 2OH make 2 waters

Sr and 2 NO3 are left

 
48.

Given the equation representing a reversible reaction:

    NH3(aq)  +  H2O(L)  <--> NH4+(aq) + OH-(aq)

The water molecule acts as an acid because it

1. accepts a hydrogen ion

2. accepts a hydroxide ion

3. donates a hydrogen ion

4. donates a hydroxide ion

 3   the water loses an H+ and becomes OH-

so it donates a hydrogen

Also that is the definition of an acid.

 

 

4   beta decay needs 1 reactant (1 on the left)

and a beta particle (Table O) on the right and daughter isotope

* the atomic number increases with a beta decay
4   These are the 2 examples

fission (splitting uranium-235)

Fusion-combing hydrogens

 

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 53-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-81 Questions 82-85 

 
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