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