June 2002 Regents 4150
Questions 110 Questions 1120 Questions 2130 Questions 3140 Questions 4150 

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Questions 
Answer  Explanations  
41 The gram formula mass of NH_{4}Cl
is

3  NH_{4}Cl=53.5g/mol
N=14 H= 4(1)=4 Cl=35.5 

42 What is the molarity of a solution that
contains 0.50 mole of NaOH in 0.50 liter of solution?

1 


2  1compound
2mixture of elements 3element 4diatomic element 

44 Which process is accompanied by a
decrease in entropy?

2 


45 If 5.0 milliliters of a 0.20 M HCl
solution is required to neutralize exactly 10. milliliters of NaOH, what is the concentration of the base?

1 


46 Exactly how much time must elapse before
16 grams of potassium42 decays, leaving 2 grams of the original isotope?

3  16>8>4>3
= 3 (1/2 lives) x12.4h 

47 Which mass measurement contains four
significant figures?

3 


48 Which pair of compounds are alcohols?

1  Look for OH and no other functional groups  
49 The process of joining many small
molecules into larger molecules is called

2  Definitionpolymerization  
What is the reading of the meniscus?

1  estimate the last decimal place

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