Chem Aug 2010 Regents

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Chem AUG 2010 Regents
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1.  A gas sample is at 25°C and 1.0 atmosphere. Which changes in temperature and pressure will cause this sample to behave more like an ideal gas? 
A.
B.
C.
D.
2.  What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point? 
A.
B.
C.
D.
3.  The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents the 
A.
B.
C.
D.
4.  A cylinder with a movable piston contains a sample of gas having a volume of 6.0 liters at 293 K and 1.0 atmosphere. What is the volume of the sample after the gas is heated to 303 K, while the pressure is held at 1.0 atmosphere? 
A.
B.
C.
D.
5.  Which compound has both ionic and covalent bonds
A.
B.
C.
D.
6.  Which unit can be used to express the concentration of a solution? 
A.
B.
C.
D.
7.  Which substance can not be broken down by a chemical change? 
A.
B.
C.
D.
8. 
Given the formula representing a molecule:     The molecule is 
A.
B.
C.
D.
9.  In which type of reaction is an atom of one element converted to an atom of a different element? 
A.
B.
C.
D.
10.  Which gas sample at STP has the same total number of molecules as 2.0 liters of CO2(g) at STP? 
A.
B.
C.
D.
11.  Given the balanced equation representing a reaction: 2NaCl(l) → 2Na(l) + Cl2(g) A 1170.-gram sample of NaCl(l) completely reacts, producing 460. grams of Na(l). What is the total mass of Cl2(g) produced? 
A.
B.
C.
D.
12.  Which formula represents an unsaturated hydrocarbon? 
A.
B.
C.
D.
13. 
Given the formula representing a hydrocarbon:     The molecular formula and the empirical formula for this hydrocarbon are 
A.
B.
C.
D.
14.  Which Group 15 element exists as diatomic molecules at STP? 
A.
B.
C.
D.
15.  In the formula X2(SO4)3, the X represents a metal. This metal could be located on the Periodic Table in 
A.
B.
C.
D.
16.  The isotopes K-37 and K-42 have the same   
A.
B.
C.
D.
17.  The reaction between an organic acid and an alcohol produces 
A.
B.
C.
D.
18.  Based on the results of testing colorless solutions with indicators, which solution is most acidic? 
A.
B.
C.
D.
19. 
The table below shows the number of subatomic particles in atom X and in atom Z.     Atom X and atom Z are isotopes of the element    
A.
B.
C.
D.
20.  In the late 1800s, experiments using cathode ray tubes led to the discovery of the 
A.
B.
C.
D.
21.  A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of 
A.
B.
C.
D.
22.   Which compound is an Arrhenius acid?    
A.
B.
C.
D.
23.  Petroleum can be separated by distillation because the hydrocarbons in petroleum are 
A.
B.
C.
D.
24.  Which formula represents a mixture?
A.
B.
C.
D.
25.  Which element is present in all organic compounds? 
A.
B.
C.
D.
26.  The entropy of a sample of CO2 increases as the CO2 changes from 
A.
B.
C.
D.
27.  Every water molecule has two hydrogen atoms bonded to one oxygen atom. This fact supports the concept that elements in a compound are 
A.
B.
C.
D.
28.  Which element forms an ionic compound when it reacts with lithium? 
A.
B.
C.
D.
29.  The percent composition by mass of nitrogen in NH4OH (gram-formula mass = 35 grams/mole) is equal to 
A.
B.
C.
D.
30.  At STP, which element is solid, brittle, and a poor conductor of electricity? 
A.
B.
C.
D.
31.  Each of four test tubes contains a different concentration of HCl(aq) at 25°C. A 1-gram cube of Zn is added to each test tube. In which test tube is the reaction occurring at the fastest rate? 
A.
B.
C.
D.
32.  Given the balanced equation representing a reaction: Br2 +energy→Br+Br Which statement describes the energy change and bonds in this reaction? 
A.
B.
C.
D.
33.  Which isotope is used to treat cancer?    
A.
B.
C.
D.
34.  Which energy conversion occurs during the operation of an electrolytic cell? 
A.
B.
C.
D.
35.  According to one acid-base theory, water acts as an acid when an H2O molecule 
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B.
C.
D.
36.  Object A at 40.°C and object B at 80.°C are placed in contact with each other. Which statement describes the heat flow between the objects? 
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B.
C.
D.
37.  What is the total number of electrons shared in a double covalent bond? 
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B.
C.
D.
38.  Which subatomic particles are located in the nucleus of an He-4 atom? 
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B.
C.
D.
39.  What is the total number of valence electrons in a calcium atom in the ground state? 
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B.
C.
D.
40.  Which element requires the least amount of energy to remove the most loosely held electron from a gaseous atom in the ground state? 
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B.
C.
D.
41.  A balanced equation representing a chemical reaction can be written using 
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B.
C.
D.
42.  Which nuclide is listed with its half-life and decay mode? 
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B.
C.
D.
43. 
  1. The greatest composition by mass in an atom of oxygen-18 is due to the total mass of its 
A.
B.
C.
D.
44.  Which sample has particles with the lowest average kinetic energy?
A.
B.
C.
D.
45.  Which balanced equation represents a redox reaction? 
A.
B.
C.
D.
46.  As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because 
A.
B.
C.
D.
47.  Which compound is insoluble in water?    
A.
B.
C.
D.
48.  The bond between which two atoms is most polar? 
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B.
C.
D.
49.  Which two factors must be equal when a chemical reaction reaches equilibrium? 
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B.
C.
D.
50.  An atom of which element has the largest atomic radius? 
A.
B.
C.
D.
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