June 2017  Chemistry Regents #36-40

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36 Given the balanced equation representing a reaction:

2NO + O2 --> 2NO + energy

The mole ratio of NO to NO is

(1) 1 to 1     (3) 3 to 2

(2) 2 to 1      (4) 5 to 2

1linkthe coefficients (#s in front are the mole ratios)
37 The particle diagram below represents a solid sample of silver.

Which type of bonding is present when valence electrons move within the sample?

(1) metallic bonding (2) hydrogen bonding

(3) covalent bonding (4) ionic bonding		1linkbonding in metals like Ag is metallic

"positive ion immersed in a sea of electrons"

38 Given the formula representing a molecule:

Which statement explains why the molecule is nonpolar?

(l) Electrons are shared between the carbon atoms and the hydrogen atoms.

(2) Electrons are transferred from the carbon atoms to the hydrogen atoms.

(3) The distribution of charge in the molecule is symmetrical.

(4) The distribution of charge in the molecule is asymmetrical.

3linkSNAP

symmetrical nonpolar asymmetrical polar

 

39 A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the compound is ionic?

(1) Both the solid and the liquid are good conductors.

(2) Both the solid and the liquid are poor conductors.

(3) The solid is a good conductor, and the liquid is a poor conductor.

(4) The solid is a poor conductor, and the liquid is a good conductor.

 		4linkConductivity depends on "Moving Charge"

solids can't move, liquids can

40 Which statement explains why 10.0 mL of a 0.50 M H2SO4(aq) solution exactly neutralizes 5.0 mL of a 2.0 M NaOH(aq) solution?

(1) The moles of H+(aq) equal the moles of OH-(aq).

(2) The moles of H2SO4(aq) equal the moles of NaOH(aq).

(3) The moles of H2SO(aq) are greater than the moles of NaOH(aq).

(4) The moles of H+(aq) are greater than the moles of OH-(aq).

 		1linkneutralization occurs when you have equal amounts of H+ reacting with OH-

 

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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