June 2011 Chemistry Regents #41-50

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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

 

Questions

Answer Link Explanations
1 Link a physical change is spreading out of the particles

no bonds are formed, no new molecules are made

42 During a laboratory activity to investigate the reaction rate, a student reacts 1.0-gram samples of solid zinc with 10.0-milliliter samples of HCl(aq). The table below shows information about the variables in five experiments the student performs.

Reactions of Zn(s) with HCl(aq)

Experiment Decription of Zinc Sample HCl(aq) Concnetration(M) Temperature (K)
1 lumps 0.10 270.
2 powder 0.10 270.
3 lumps 0.10 290.
4 lumps 1.0 290.
5 powder 1.0 280.

Which two experiements can be used to investigate the effect of the concentration of HCl(aq) on the reaction rate?

(1) 1 and 3  (2) 1 and 5  (3)  4 and 2  (4)  4 and 3

4 Link to investigate a property, all others variables must be held constant
43. Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?

(1) from 400.K to 200.K

(2) from 200.K to 400.K

(3) from 400.oC to 200.oC

(4) from 200.oC to 400.oC

2 Link V/T=V/T

to double the volume the kelvin temperature must be doubled

44 A 36-gram sample of water has an initial temperature of 22oC. After the sample absorbs 1200 joules of heat energy, the final temperature of the sample is

(1) 8.0oC  (2) 14oC  (3)  30.oC  (4) 55oC

3 Link you add heat the final temperature will be higher

q=mCDT

DT=q/mC=1200J/(36g x 4.18J/gC)= 8oC

22 + 8=30oC

45 Which statement explains why Br2 is a liquid at STP and I2 is a solid at STP?

(1) Molecules of Br2 are polar, and molecules of I2 are nonpolar.

(2) Molecules of I2 are polar, and molecules of Br2 are nonpolar.

(3) Molecules of Br2 have stronger intermolecular forces than molecules of I2.

(4) Molecules of I2 have stronger intermolecular forces than molecules of Br2.

4 Link solids have stronger IMFs than liquids (and gases)
46 Which balanced equation represents an oxidation-reduction reaction?

(1) Ba(NO3)2 + Na2SO4 ==> BaSO4 + 2NaNO3

(2) H3PO4 + 3KOH==> K3PO4 + 3H2O

(3)  Fe(s) + S(s) ==> FeS(s)

(4) NH3(aq) + HCl(aq)==> NH4Cl(s)

3 Link redox reactions have a change in oxidation numbers

look for a free element (ox #=O) and that element in a compound (ox # not 0) on the other side

47 Which solution reacts with LiOH(aq) to produce a salt and water?

(1) KCl(aq)  (2)  CaO(aq)  (3)NaOH(aq)  (4)H2SO4(aq)

4 Link Neutralization LiOH is a base and must react with an acid to produce salt and water

Acid start with Hydrogen

48 Which volume of 2.0M NaOH(aq) is need to completely neutralize 24 milliliters of 1.0M HCl(aq)?

(1) 6.0mL  (2) 12mL  (3) 24mL  (4)  48mL

2 Link titration   MV=MV

2.0M(V)=1.0M(24mL)

V=12mL

49 Which type of reaction releases the greatest amount of energy per mole of reactant?

(1) combustion  (2) decomposition  (3) nuclear fusion  (4) oxidation-reduction

3 Link nuclear reactions release the greatest amounts of energy
50 Which balanced equation represents natural transmutation?

 

4 Link natural transmutation have only 1 reactant

artificial has 2

transmutation is when 1 element becomes another by changing the number of protons

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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