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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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 OC

(4) 101.3 atm and 273C

3 Link Reference 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.

1 Link # 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

1 Link substances =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

1 Link properties 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

4 Link q=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

3 Link "effective collisions"

18 Which compound is soluble in water?

(1) PbS (3) Na2S

(2) BaS (4) Fe2S3

3 Link Table 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

3 Link Chemical 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

2 Link gas 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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