June 2015 Chemistry Regents #11-15

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11. All atoms of uranium have the same

(1) mass number

(2) atomic number

(3)  number of neutrons plus protons

(4) number of neutrons plus electrons

2 Link Uranium atoms must have the same atomic number or it is not uranium
12. The concentration of a solution can be expressed in

(1) kelvins

(2) milliliters

(3) joules per kilogram

(4) moles per liter

4 Link Molarity =moles of solute/liter of solution
13 Compared to the boiling point and the freezing point of water at 1 atmosphere, a 1.0 M CaCl2(aq) solution at 1 atmosphere has a

(1) lower boiling point and a lower freezing point

(2) lower boiling point and a higher freezing point

(3) higher boiling point and a lower freezing point

(4) higher boiling point and a higher freezing point

3 Link solutions have higher boiling point and a lower freezing point than the pure solvent

 

14 According to the kinetic molecular theory, which statement describes an ideal gas?

(1) The gas particles are diatomic

(2) Energy is created when the gas particles collide

(3) There are no attractive forces between the gas particles

(4) The distance between the gas particles is small, compared to their size.

3 Link ideal gases have no attraction or they might become liquids under certain conditions
15 Which physical change is endothermic?

(1) CO2(s)-->CO2(g)      (3) CO2(g)-->CO2(l)

(2) CO2(l)-->CO2(s)       (4) CO2(g)-->CO2(s)

1 Link S   L  G problem

1  S---->G       3   L<---G

2    S<----L     4    S<----G

3 are wrong and 1 is right

 

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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