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Chem Aug 2010 Regents

50 Questions  I  By Ionca
chem AUG 2010 Regents
Multiple choice + explanations.

  
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1.  According to one acid-base theory, water acts as an acid when an H2O molecule 
A.
B.
C.
D.
2.  Which formula represents an unsaturated hydrocarbon? 
A.
B.
C.
D.
3.  The reaction between an organic acid and an alcohol produces 
A.
B.
C.
D.
4.  Which Group 15 element exists as diatomic molecules at STP? 
A.
B.
C.
D.
5.  Which balanced equation represents a redox reaction? 
A.
B.
C.
D.
6.  Which element forms an ionic compound when it reacts with lithium? 
A.
B.
C.
D.
7.  Which unit can be used to express the concentration of a solution? 
A.
B.
C.
D.
8.  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.
9.  In the late 1800s, experiments using cathode ray tubes led to the discovery of the 
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B.
C.
D.
10.  Given the balanced equation representing a reaction: Br2 +energy→Br+Br Which statement describes the energy change and bonds in this reaction? 
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B.
C.
D.
11.  The entropy of a sample of CO2 increases as the CO2 changes from 
A.
B.
C.
D.
12.  Which nuclide is listed with its half-life and decay mode? 
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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? 
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B.
C.
D.
14.  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.
15.  What is the total number of electrons shared in a double covalent bond? 
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B.
C.
D.
16. 
  1. The greatest composition by mass in an atom of oxygen-18 is due to the total mass of its 
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B.
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D.
17.  Which compound is insoluble in water?    
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B.
C.
D.
18.  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.
19.  Given the formula representing a hydrocarbon:     The molecular formula and the empirical formula for this hydrocarbon are 
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B.
C.
D.
20.  A balanced equation representing a chemical reaction can be written using 
A.
B.
C.
D.
21.  The percent composition by mass of nitrogen in NH4OH (gram-formula mass = 35 grams/mole) is equal to 
A.
B.
C.
D.
22.  As the temperature of a chemical reaction in the gas phase is increased, the rate of the reaction increases because 
A.
B.
C.
D.
23.  In which type of reaction is an atom of one element converted to an atom of a different element? 
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B.
C.
D.
24.   Which compound is an Arrhenius acid?    
A.
B.
C.
D.
25.  Petroleum can be separated by distillation because the hydrocarbons in petroleum are 
A.
B.
C.
D.
26.  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.
27.  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.
28.  At STP, which element is solid, brittle, and a poor conductor of electricity? 
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B.
C.
D.
29.  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    
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B.
C.
D.
30.  Which element is present in all organic compounds? 
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B.
C.
D.
31.  Given the formula representing a molecule:     The molecule is 
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D.
32.  What is the minimum amount of heat required to completely melt 20.0 grams of ice at its melting point? 
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B.
C.
D.
33.  The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents the 
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D.
34.  An atom of which element has the largest atomic radius? 
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B.
C.
D.
35.  The bond between which two atoms is most polar? 
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B.
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D.
36.  Which formula represents a mixture?
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B.
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D.
37.  What is the total number of valence electrons in a calcium atom in the ground state? 
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D.
38.  Which compound has both ionic and covalent bonds
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B.
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D.
39.  Which two factors must be equal when a chemical reaction reaches equilibrium? 
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B.
C.
D.
40.  Which sample has particles with the lowest average kinetic energy?
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B.
C.
D.
41.  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? 
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B.
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D.
42.  The isotopes K-37 and K-42 have the same   
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B.
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D.
43.  Which energy conversion occurs during the operation of an electrolytic cell? 
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B.
C.
D.
44.  Every water molecule has two hydrogen atoms bonded to one oxygen atom. This fact supports the concept that elements in a compound are 
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B.
C.
D.
45.  Which substance can not be broken down by a chemical change? 
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B.
C.
D.
46.  Which gas sample at STP has the same total number of molecules as 2.0 liters of CO2(g) at STP? 
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B.
C.
D.
47.  Based on the results of testing colorless solutions with indicators, which solution is most acidic? 
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B.
C.
D.
48.  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.
49.  Which isotope is used to treat cancer?    
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B.
C.
D.
50.  Which subatomic particles are located in the nucleus of an He-4 atom? 
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B.
C.
D.
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