June 2011 Chemistry Regents #31-40

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Questions

Answer Link Explanations
31 Compared to the atoms of a nonmetal in Period 3, the atoms of metals in Period 3 have

(1) fewer valence electrons

(2) more valence electrons

(3) fewer electron shells

(4) more electron shells

1 Link metals are on the left of a period and have fewer valence electrons (last number in the configuration)
32 Which elements are malleable and good conductors of electricity?

(1) iodine and silver

(2) iodine and xenon

(3) tin and silver

(4) tin and xenon

3 Link malleable (hammered into sheets) and conductors are properties of metals

left of the staircase are the metals

33 Which atom in the ground state requires the least amount of energy to remove its valence electron?

(1) lithium atom  (2) potassium atom  (3) rubidium atom  (4) sodium atom

3 Link least amount of energy to remove an electron

LOWEST Ionization energy  (Table S)

34 What is the chemical formula of iron(III) sulfide?

(1) FeS  (2) Fe2S3 (3) FeSO3  (4) Fe2(SO3)3

2 Link Iron(III) Sulfide

Fe3+ S2-  ==> Fe2S3

35 What is the percent composition by mass of sulfur in the compound MgSO4 (gram-formula mass =120. grams per mole)?

(1) 20.%  (2) 27%  (3) 46%  (4) 53%

2 Link (32/120) x 100%=27%
36 Which compound becomes less soluble in water as the temperature of the solution is increased?

(1) HCl  (2) KCl  (3) NaCl  (4)  NH4Cl

1 Link Table G
37 Given the balanced equation representing a reaction:

2H2 + O2 ==> 2H2O

What is the mass of H2O produced when 10.0 grams of H2 react completely with 80.0 grams of O2?

(1) 70.0 g  (2) 90.0 g  (3) 180. g  (4) 800. g

2 Link Find the missing mass

10g + 80g==> X

X=90g

38 Given the two formulas representing the same compound:
Formula A Formula B
CH3 C2H6

Which statement describes these formulas?

(1) Formulas A and B are both empirical.

(2) Formulas A nd B are both molecular.

(3) Formula A is empirical and Formula B is molecular.

(4) Formula A is molecular and Formula B is empirical.

3 Link they come from the same compound

A is a reduced formula so it is empirical

B is a multiple of A so it molecular

39 Given the balanced equation representing a reaction:

Zn(s) +H2SO2(aq) ==> ZnSO4(aq) + H2(g)

What type of reaction is represented by this equation?

(1) decomposition           (3) single replacement

(2) double replacement   (4) synthesis

3 Link single replacement   A+ BC==> AC + B

only one element replaces another

40 In a laboratory where the air is 22oC, a steel cylinder at 100.oC is submerged in water at 40.oC. In this system, heat flow from

(1) both the air and the water to the cylinder

(2) both the cylinder and the air to the water

(3) the air to the water and from the water to the cylinder

(4) the cylinder to the water and from the water to the air

4 Link order of temperature  (heat flows from hot to cold)

100oC steel cylinder in water at 40oC (no contact with the air)

water at 40oC to the air at 22oC

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

Question 51 Questions 52-54 Questions 55-59 Questions 60-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-70 Questions 71-73 Questions 74-76 Questions 77-79 Questions 80-82 Questions 83-85

 
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