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