January 2016 Chemistry Regents #46-50

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Question 51-53 Questions 54-56
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46   The pH of a solution is 7. When acid is added to the solution, the hydronium ion concentration becomes 100 times greater. What is the pH of the new solution?

(1) 1    (2) 5     (3) 9     (4) 14

2   hydronium increase is more acidic...lower pH

100 has 2 zeros..pH changes by 2 towards a lower pH

 

47 Given the formula for a compound:

A chemical name for this compound is

(1) butanal     (2) butanol

(3) butanone    (4) butanoic acid

3   ketone with 4 carbons

-one

48  What occurs in both fusion and fission reactions?

(1) Small amounts of energy are converted into large amounts of matter.

(2) Small amounts of matter are converted into large amounts of energy.

(3) Heavy nuclei are split into lighter nuclei. 

(4) Light nuclei are combined into heavier nuclei.

2   matter converts to energy

 

49 Given the reaction:

Which particle is represented by X?

4   mass number (top #)   27 + 4= x + 1.......so 30

atomic number (bottom #)  13 + 2 = x + 0....so 15

atomic # 15 is P

50 A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10 years?

(1) 1/2     (3) 1/8

(2) 1/4     (4) 1/16

4   10/2.5 is 4 half lives

1-->1/2/-->1/4-->1/8-->1/16

 

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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

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85
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