June 2019  Chemistry Regents #36-40

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36 Given the balanced equation for the reaction between butane and oxygen:

2C4H10 + 13O2 --> 8CO2 + 10 H2O + Energy

How many moles of carbon dioxide are produced when 5.0 moles of butane react completely?

(1) 5.0 mol

(2)  10. mol

(3)  20. mol

(4)  40. mol

 

3  set up a proportion

5moles is to 2 C4H10

as X moles is to 8 CO2

37 What ios the percent composition by mass of nitrogen in the compound N2H4 (gram-formula mass = 32 g/mol).

(1)  13%

(2)  44%

(3)  88%

(4)  93%

 

 3  n is 14 but there are 2

28/32 x 100

38 Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?

(1)  Ca2+

(2)  Cl-

(3)  Li+

(4)  O2-

 

 4  so 10 electrons

 

negative charge has more electrons

positive gave them away

 

 

 1  Hydrogen Bonding question

H with F,O or N has teh strongest forces

 1  Xenon is a gas at STP

 

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 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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