January 2016 Chemistry Regents #41-45

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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

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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41  Which formula represents an unsaturated hydrocarbon?

(1) C2H4      (2) C3H8

(3) С4Н10    (4) С5Н12

1   the only one that is not an alkane

not CnH2n+2

42  Which radioisotope is used in dating geological formations?

(1) I-131     (2) U-238

(3) Ca-37    (4) Fr-220

2   largest half-life

just memorize it

43 The heating curve below represents a sample of a substance starting as a solid below its melting point and being heated over a period of time

Which statement describes the energy of the particles in this sample during interval DE?

(1) Both potential energy and average kinetic energy increase.

(2) Both potential energy and average kinetic energy decrease.

(3) Potential energy increases and average kinetic energy remains the same.

(4) Potential energy remains the same and average kinetic energy increases.

3   Plateau...phase change....PE change

Potential energy increases and average kinetic energy remains the same

 

44 Given the potential energy diagram for a reaction:

Which intervals are affected by the addition of a catalyst?

(1) 1 and 2    (2) 1 and 3

(3) 2 and 4    (4) 3and 4

2   anything that touches the top of the hill
45  Which balanced equation represents a redox reaction?

(1) Mg + Cl2 ==> MgCl2

(2) CaO + H2O ==> Ca(OH)2

(3) HNO3 + NaOH ==> NaNO3 + H2O

(4) NaCl + AgNO3 ==>AgCl + NaNO3

1   look for the free element on one side and the same element in a compound on the other

 

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

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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