June 2023  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 53-54 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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3   electrolysis uses a power source to produce elements from a molten compound
47 Which aqueous solution has the greatest ability to conduct an electric current?

            1. 0.10 M NaCl(aq)

            2. 0.010 M NaCl(aq)

            3. 0.10 M C6H12O6(aq)

            4. 0.010 M C6H12O6(aq)

 1   3 and 4 are sugar and are nonelectroyltes

1 has the large concentration and is the better conductor
48 What  fraction remaining of an original sample of 131I remains unchanged after 24.063 days?

            1.  1/8

            2.  1/2

            3.  1/3

            4.  1/4

 1   Look up the half life on Table N =8.021 d

24.063 d/  8.021d=  3 half lives

1--> 1/2-->1/4--> 1/8

 

49 Given the equation represented a reaction:

2

H +

2

H -->

3

He +

1

n + Energy

1

1

2

0

Which type of reaction is represented by the equation?

            1.  nuclear fission

            2.  nuclear fusion

            3.  combination

            4.  substitution

 2   two hydrogen atoms make helium fusion
1   find the missing mass

in 6.0151 +2.0140 =8.0291 u

out

2 x 4.0026 =8.0052 u

missing mass = 8.0291-8.0052=0.0239u

 

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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