January 2013 Chemistry Regents #21-30

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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21 The phase of a sample of a molecular substance at STP is not determined by its

(1) arrangement of molecules

(2) intermolecular forces

(3) number of molecules

(4) molecular structure

3 Link phase are determined by molecular structure, which determines the strength of intermolecular forces and how they will be arraigned.

***Ponder this= if you have 1 molecule what phase is that in?

22 Which atom has the weakest attraction for electrons in a chemical bond?

(1) a boron atom (3) a fluorine atom

(2) a calcium atom (4) a nitrogen atom

2 Link definition of electronegativity

Smallest value on Table S

23 Which statement describes a chemical reaction at equilibrium?

(1) The products are completely consumed in the reaction.

(2) The reactants are completely consumed in the reaction.

(3) The concentrations of the products and reactants are equal.

(4) The concentrations of the products and reactants are constant.

4 Link Con Con REqual

concentrations are constant and the rates are equal

 

24 Which element has atoms that can bond to each other in rings and networks?

(1) aluminum   (3) hydrogen

(2) carbon     (4) oxygen

2 Link carbon

25 In an oxidation-reduction reaction, the total number of electrons lost is

(1) equal to the total number of electrons gained

(2) equal to the total number of protons gained

(3) less than the total number of electrons gained

(4) less than the total number of protons gained

1 Link conservation of charge lost=gained

26 Which compounds are electrolytes?

(1) C2H5OH and H2SO4

(2) C2H5OH and CH4

(3) KOH and H2SO4

(4) KOH and CH4

3 Link Acids, Bases and Salts are electrolytes

 

 

27 Which compounds yield hydrogen ions as the only positive ions in an aqueous solution?

(1) H2CO3 and HC2H3O2

(2) H2CO3 and NaHCO3

(3) NH3 and HC2H3O2

(4) NH3 and NaHCO3

1 Link definition of an acid

Table K

28 Nuclei of U-238 atoms are

(1) stable and spontaneously absorb alpha particles

(2) stable and spontaneously emit alpha particles

(3) unstable and spontaneously absorb alpha particles

(4) unstable and spontaneously emit alpha particles

4 Link Table N

 

29 Which nuclear emission has the greatest penetrating power?

(1) proton

(2) beta particle

(3) gamma radiation

(4) positron

3 Link gamma most...alpha least

30 The dating of geological formations is an example of a beneficial use of

(1) isomers

(2) electrolytes

(3) organic compounds

(4) radioactive nuclides

4 Link radioactive nuclides

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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