January 2013 Chemistry Regents #11-20

Highlight to reveal answers and explanations

 

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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Questions

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Explanations

11 Which set of values represents standard pressure and standard temperature?

(1) 1 atm and 101.3 K

(2) 1 kPa and 273 K

(3) 101.3 kPa and O°C

(4) 101.3 atm and 273°C

3LinkReference Table A

12 Which statement about one atom of an element identifies the element?

(1) The atom has 1 proton.

(2) The atom has 2 neutrons.

(3) The sum of the number of protons and neutrons in the atom is 3.

(4) The difference between the number of neutrons and protons in the atom is 1.

1Link# of protons = atomic number, which determines the element

13 A substance is classified a, either an element or a

(1) compound

(2) solution

(3) heterogeneous mixture

(4) homogeneous mixture

1Linksubstances =pure= elements and compounds

 

14 A solid element that is malleable, a good conductor of electricity, and reacts with oxygen is classified as a

(1) metal

(2) metalloid

(3) noble gas

(4) nonmetal

1Linkproperties of metals

15 Three forms of energy are

(1) chemical, exothermic, and temperature

(2) chemical, thermal, and electromagnetic

(3) electrical, nuclear, and temperature

(4) electrical, mechanical, and endothermic

2 Forms of energy=kinetic, potential, electrical, nuclear, chemical, thermal, solar, mechanical, electromagnetic (light), electrochemical, sound

exothermic and endothermic are directional changes in energy

temperature= average kinetic energy

 

16 What is the total amount of heat required to vaporize 1.00 gram of H2O(g) at 100.0C and 1 atmosphere?

(1) 4.18 J

(2) 334 J

(3) 373 J

(4) 2260 J

4Linkq=mHv

q= 1.00g x 2260J/g= 2260J

 

17 What is required for a chemical reaction to occur?

(1) standard temperature and pressure

(2) a catalyst added to the reaction system

(3) effective collisions between reactant particles

(4) an equal number of moles of reactants and products

3Link"effective collisions"

18 Which compound is soluble in water?

(1) PbS (3) Na2S

(2) BaS (4) Fe2S3

3LinkTable F

 

19 Compared to a 26-gram sample of NaCl(s) at STP, a 52-gram sample of NaCl(s) at STP has

(1) a different density

(2) a different gram-formula mass

(3) the same chemical properties

(4) the same volume

3LinkChemical properties are intrinsic and do not change based on amount

20 A gas changes directly to a solid during

(1) fusion         (3) saponification

(2) deposition   (4) decomposition

2Linkgas to a solid

deposition

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

Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

Questions 70-72 Questions 73-76 Questions 77-79 Questions 80-82 Questions 83-85

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