June 2015  Chemistry Regents #41-45

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Questions

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Explanations

41 Which elements can react to produce a molecular compound?

(1) calcium and chlorine

(2) hydrogen and sulfur

(3) lithium and fluorine

(4) magnesium and oxygen

2 link molecular is covalent

covalent is 2 nonmetals

 

42 Compared to a 10-mole sample of NaCl(s), a 10-mole sample of NaCl(l) has a different

(1) number of ions

(2) empirical formula

(3) gram-formula mass

(4) electrical conductivity

4 link electricity requires "moving charge"

 

solids have ions that can't move

43 Which property of an unsaturated solution of sodium chloride in water remains the same when more water is added to the solution?

(1) density of the solution

(2) boiling point of the solution

(3) mass of sodium chloride in the solution

(4) percent by mass of water in the solution

3   more water does not change the mass of NaCl in the water.

 

44 Which ion combines with Ba2+ to form a compound that is most soluble in water?

(1) S2- (2) OH-  (3)  CO32-  (4)  SO42-

2 link table F

45 When a sample of gas is cooled in a sealed, rigid container, the pressure the gas exerts on the walls of the container will decrease because the gas particles hit the walls of the container

(1) less often and with less force

(2) less often and with more force

(3) more often and with less force

(4) more often and with more force 

1 link lower temperature, less energy, slower particles

 

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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