Chem Aug 2010 Regents

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Chem AUG 2010 Regents
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1.  Which nuclide is listed with its half-life and decay mode? 
A.
B.
C.
D.
2.  What is the total number of valence electrons in a calcium atom in the ground state? 
A.
B.
C.
D.
3.  The isotopes K-37 and K-42 have the same   
A.
B.
C.
D.
4. 
Given the formula representing a molecule:     The molecule is 
A.
B.
C.
D.
5.  Which two factors must be equal when a chemical reaction reaches equilibrium? 
A.
B.
C.
D.
6.  Petroleum can be separated by distillation because the hydrocarbons in petroleum are 
A.
B.
C.
D.
7. 
Given the formula representing a hydrocarbon:     The molecular formula and the empirical formula for this hydrocarbon are 
A.
B.
C.
D.
8.  Which Group 15 element exists as diatomic molecules at STP? 
A.
B.
C.
D.
9.  The entropy of a sample of CO2 increases as the CO2 changes from 
A.
B.
C.
D.
10.  In which type of reaction is an atom of one element converted to an atom of a different element? 
A.
B.
C.
D.
11.  At STP, which element is solid, brittle, and a poor conductor of electricity? 
A.
B.
C.
D.
12.  Which energy conversion occurs during the operation of an electrolytic cell? 
A.
B.
C.
D.
13.  Which element requires the least amount of energy to remove the most loosely held electron from a gaseous atom in the ground state? 
A.
B.
C.
D.
14.  The reaction between an organic acid and an alcohol produces 
A.
B.
C.
D.
15.  Which compound has both ionic and covalent bonds
A.
B.
C.
D.
16.  The percent composition by mass of nitrogen in NH4OH (gram-formula mass = 35 grams/mole) is equal to 
A.
B.
C.
D.
17.  Which substance can not be broken down by a chemical change? 
A.
B.
C.
D.
18.  Which balanced equation represents a redox reaction? 
A.
B.
C.
D.
19.  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.
20.  Which unit can be used to express the concentration of a solution? 
A.
B.
C.
D.
21.  Which isotope is used to treat cancer?    
A.
B.
C.
D.
22.   Which compound is an Arrhenius acid?    
A.
B.
C.
D.
23.  In the late 1800s, experiments using cathode ray tubes led to the discovery of the 
A.
B.
C.
D.
24. 
  1. The greatest composition by mass in an atom of oxygen-18 is due to the total mass of its 
A.
B.
C.
D.
25.  Based on the results of testing colorless solutions with indicators, which solution is most acidic? 
A.
B.
C.
D.
26.  Which compound is insoluble in water?    
A.
B.
C.
D.
27.  Which formula represents a mixture?
A.
B.
C.
D.
28.  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.
29.  Which element is present in all organic compounds? 
A.
B.
C.
D.
30.  Which element forms an ionic compound when it reacts with lithium? 
A.
B.
C.
D.
31.  What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point? 
A.
B.
C.
D.
32. 
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.
33.  Which subatomic particles are located in the nucleus of an He-4 atom? 
A.
B.
C.
D.
34.  An atom of which element has the largest atomic radius? 
A.
B.
C.
D.
35.  Which sample has particles with the lowest average kinetic energy?
A.
B.
C.
D.
36.  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.
37.  The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents the 
A.
B.
C.
D.
38.  A balanced equation representing a chemical reaction can be written using 
A.
B.
C.
D.
39.  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.
40.  What is the total number of electrons shared in a double covalent bond? 
A.
B.
C.
D.
41.  The bond between which two atoms is most polar? 
A.
B.
C.
D.
42.  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.
43.  As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because 
A.
B.
C.
D.
44.  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.
45.  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.
46.  Which formula represents an unsaturated hydrocarbon? 
A.
B.
C.
D.
47.  According to one acid-base theory, water acts as an acid when an H2O molecule 
A.
B.
C.
D.
48.  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.
49.  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.
50.  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? 
A.
B.
C.
D.
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