June 2013 Chemistry Regents #11-20

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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11 A sample of CO2(s) and a sample of CO2(g) differ in their

(1) chemical compositions

(2) empirical formulas

(3) molecular structures

(4) physical properties

4 link one is a gas and the other is a solid, so physically they are different

12 Which statement defines the temperature of a sample of matter?

(1) Temperature is a measure of the total electromagnetic energy of the particles.

(2) Temperature is a measure of the total thermal energy of the particles.

(3) Temperature is a measure of the average potential energy of the particles.

(4) Temperature is a measure of the average kinetic energy of the particles.

4 link definition of temperature. On every Regents, possibly more than once

13 For a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

(1) heat of fusion

(2) heat of reaction

(3) activation energy of the forward reaction

(4) activation energy of the reverse reaction

2 link definition of Heat of Reaction

 

14 Which equation represents sublimation?

(1) Hg(l) ---> Hg(s)         (3) NH3(g)--->NH3(l)

(2) H2O(s)--->H2O(g)     (4) CH4(l) --->CH4(g)

2 link solid to a gas is sublimation

15 Which statement describes the particles of an ideal gas, based on the kinetic molecular theory?

(1) The motion of the gas particles is orderly and circular.

(2) The gas particles have no attractive forces between them.

(3) The gas particles are larger than the dis­tances separating them.

(4) As the gas particles collide, the total energy of the system decreases.

2 link ideal gases don't attract

16 Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as

(1) an element

(2) a compound

(3) a homogeneous mixture

(4) a heterogeneous mixture

 

3 link solution is a homogeneous mixture. It looks the same (pure) throughout.

 

17 Which compound has the strongest hydrogen bonding between its molecules?

(1) HBr     (3) HF

(2) HCl      (4) HI

3 link H-bonding...look for the FON sisters

HF, H2O, NH3

18 Powdered sulfur is yellow, and powdered iron is gray. When powdered sulfur and powdered iron are mixed at 20°C, the powdered iron

(1) becomes yellow (3) remains ionic

(2) becomes a liquid (4) remains magnetic

4   mixing is not reacting, the properties remain the same

 

19 An effective collision between reactant particles requires the particles to have the proper

(1) charge and mass

(2) charge and orientation

(3) energy and mass

(4) energy and orientation

4 link  effective collisions require enough energy and the correct orientation to react

20 Which term is defined as a measure of the disorder of a system?

(1) heat (3) kinetic energy

(2) entropy (4) activation energy

2 link definition of entropy

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51-53 Questions 54-56 Questions 57-59 Questions 60-62 Questions 63-65 Questions 66-69 Questions 70-73 Questions 74-77  Questions 78-80  Questions 81-82  Questions 83-85

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