June 2015  Chemistry Regents #36-40

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36 In the formula for the compound XCl4, the X could represent

(1) C       (3) Mg

(2) Η        (4) Zn

1 links carbon bonds 4 times

37 The formula C2H4 can be classified as

(1) a structural formula, only

(2) a molecular formula, only

(3) both a structural formula and an empirical formula

(4) both a molecular formula and an empirical formula

2 link  it can be reduced (not empirical)

its not a structure

so it is only a molecular formula

38 Given the balanced equation representing a reaction:

4Al(s) + O2(g) --> 2Al2O3(s)

How many moles of  Al(s) react completely with 4.50 moles of  O2(g)to produce 3.00 moles of  Al2O3(s)?

(1) 1.50 mol      (2) 2.00 mol

 (3) 6.00 mol      (4) 4.00 mol

3 link set up a proportion

3.00mol/2Al2O3 =  x mol/4Al

 

39. What is the percent composition by mass of oxygen in Ca(NO3)2 (gram-formula mass=164 g/mol)?

(1) 9.8%     (3) 48%

(2) 29%      (4) 59% 

4 link ((6 x 16) /164) x 100%

40 Given the balanced equation representing a reaction:

6Li +N2 --> 2Li3N

Which type of chemical reaction is represented by this equation?

(1) synthesis               (2) decomposition

(3) single replacement (4) double replacement

1 link A + B==> C  synthesis

 

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 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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