June 2024  Chemistry Regents #31-35

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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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31. The numbers of protons, neutrons, and electrons in each of four different ions are shown in the table below. Which ion has the greatest mass?

1 A
2 E
3 G
4 Z

 2   ignore electrons, they have a tiny mass

protons and neutrons are 1u

A=109

E=120

G=119

Z=110
32. The mass of a sample of nickel is determined to be 20.40 grams. How many significant figures are used to express this mass?
1
2
3
4		 4   trailing zeros count if there is a decimal
33. What is a chemical name for the compound PbO₂?
1 Lead(I) oxide
2 Lead(II) oxide
3 Lead(III) oxide
4 Lead(IV) oxide		 4   The roman numeral is the charge of the lead

Pb=4+

O each are 2-

 


34. Which formula is the empirical formula for ethane, C₂H₆?
1 CH
2 CH₂
3 C₂H₃
4 CH₃		 4   empirical formula is the reduced formula
35. Given a balanced equation representing a reaction:

2CO(g) + O2(g) --> 2CO2(g) + ENERGY

Which mass of O2(g) reacts completely with 5.6 grams of CO(g) to produce 8.8 grams of CO2(g)?

1.  1.6g                  3  3.2g

2. 2.8g                   4  14.4g

 3   8.8g = 5.6g + X

X= 3.2g

 

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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