June 2017  Chemistry Regents #41-45

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Explanations

41 Which particle diagram represents one substance in the gas phase?

3linkgases are spread out

they must be the same compounds or elements to be one substance

42 Given the equation representing a chemical reaction at equilibrium in a sealed, rigid container:

H2(g) + I2(g) + energy --> 2HI(g)

When the concentration of H2(g) is increased by adding more hydrogen gas to the container at constant temperature, the equilibrium shifts

(1) to the right, and the concentration of HI(g) decreases

(2) to the right, and the concentration of HI(g) increases

(3) to the left, and the concentration of HI(g) decreases

(4) to the left, and the concentration of HI(g) increases

2linkincrease the concentration of a reactant, the equilibrium shifts right, producing more product HI

LeChaterliers Principle

43 Which diagram represents the potential energy changes during an exothermic reaction?

4linkexothermic reactions start high go over a hill and end lower

releasing energy

 

44. Which compound is classified as an ether?

(1)  CH3CHO

(2)  CH3OCH3

(3)  CH3COCH3

(4) CH3COOCH3

2linkRT Table R  R-O-R

probably should expand them and make sure carbon has 4 bonds to spot the ether

3 is a ketone

45 Given the equation representing a reversible reaction:

 HCO- (aq) + H2O(l) <--> H2CO3 (aq) + OH-(aq)

Which formula represents the H+ acceptor in the forward reaction?

(1)  HCO- (aq)

(2)  H2O(l)

(3)  H2CO3 (aq)

(4)  OH-(aq)

 

1linkbases accept H+, they have l less hydrogen than its conjugate acid on the otherside

 

HCO-  ==> H2CO3

 

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 54-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-76  Questions 77-80  Questions 81-82  Questions 83-85 

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