June 2012 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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1 The mass of the proton is approximately equal to the mass of

(1)an alpha particle    (2) a beta particle (3) a positron  (4) a neutron

4 link Protons and neutrons have the same mass
2 An orbital of an atom is defined as the most probable location of

(1) an electron (2) a neutron  (3) a positron  (4) a proton

1 link electrons reside in orbitals
3 What must occur when an electron in an atom returns from a higher energy state to a lower energy state?

(1) A specific amount of energy is released

(2) A random amount of energy is released

(3) The atom undergoes transmutation

(4) The atom spontaneously decays

1 link light is emitted at specific wavelengths and therefore specific amounts of energy

 

4 Which element is liquid at 305K and 1.0 atm?

(1) magnesium  (2) fluorine (3) gallium (4) iodine

3 link Using table S, the melting point needs to be lower than 305K and the boiling point needs to be greater than 305K
5 Which list of elements consist of a metal, a metalloid and a nonmetal?

(1) Li, Na, Rb   (2) Cr, Mo, W   (3) Sn, Si, C    (4) O, S, Te

3 link metals are on the left of the PT, Nonmetals on the right, and metalloids are on the staircase
6 At STP, which physical property of aluminum always remains the same from sample to sample?

(1) mass  (2) density (3) length  (4) volume

2 link density is a proportion of mass to volume and will not change

 

7 Which describes a chemical property of silicon?

(1) Silicon has a blue-gray color

(2) Silicon is a brittle solid at 20oC

(3) Silicon melts at 1414o

(4) Silicon reacts with fluorine

4 link reactions are chemical properties, the others are physical properties
1 link Elements are made of only one type of atom, the mixture has diatomic and  triatomic molecules together

 

9 A compound is broken down by chemical means during

(1) chromatography   (2) distillation   (3) electrolysis   (4)  filtration

3 link electrolysis separates compounds into its elements by using electricity
10 Which quantities must be conserved in all chemical reactions?

(1) mass, charge, density   (2) mass, charge, energy

(3) charge volume, density (4)  charge volume, energy

2 link mass, charge and energy are all conserved

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Question 51 Questions 52-55 Questions 56-59 Questions 60-62 Questions 63-65 Questions 66-68 Questions 69-71 Questions 72-75  Questions 76-78  Questions 79-81  Questions 82-85

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