June 2015 Chemistry Regents #21-25

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21. In a redox reaction, which particles are lost and gained in equal numbers?

(1) electrons            (3)  hydroxide ions

(2) neutrons             (4) hydronium ions

1Link

Reduction-oxidation (redox) reactions are chemical reactions in which reactants experience a change in oxidation number (which means these reactants either gain or lose electrons).

 
22. What is the oxidation state for a Mn atom?

(1) 0    (2)  +7    (3)  +3    (4)  +4

1linkfree elements have an oxidation state of zero

also atoms have no charge

23. Which compounds are classified as electrolytes?

(1) KNO3 and H2SO4

(2) KNO3 and CH3OH

(3) CH3OCH3 and H2SO4

(4) CH3OCH3 and CH3OH

1linkacids bases and soluble salts

 

24. Which compound is an Arrhenius base?

(1) CO2   (2)  CaSO4   (3)  Ca(OH)2    (4)  C2H5OH

3linkbases have hydroxide in the formula

exclude alcohols

25. According to one acid-base theory, a water molecule acts as a base when it accepts  

(1) an H+ ion       (3) a neutron

(2) an OH- ion    (4) an electron

1link

acid: anything that donates a [H+] (proton donor)

base: anything that accepts a [H+] (proton acceptor)

 

 

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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