June 2018 Chemistry Regents Questions 11-20 Question Preview (ID: 59751)


Use Your Knowledge Of Chemistry To Answer All Questions In The Data Set. You Will Need Your Chemistry Reference Tables And A Calculator To Answer Some Of The Questions. Good Luck. TEACHERS: click here for quick copy question ID numbers.

Based on Table S, which group on the Periodic Table has the element with the highest electronegativity?
a) Group 1
b) Group 2
c) Group 17
d) Group 18

What is represented by the chemical formula PbCl2(s)?
a) a substance
b) a solution
c) a homogeneous mixture
d) a heterogeneous mixture

What is the vapor pressure of propanone at 50.°C?
a) 37 kPa
b) 50. kPa
c) 83 kPa
d) 101 kPa

Which statement describes the charge distribution and the polarity of a CH4 molecule?
a) The charge distribution is symmetrical and the molecule is nonpolar.
b) The charge distribution is asymmetrical and the molecule is nonpolar.
c) The charge distribution is symmetrical and the molecule is polar.
d) The charge distribution is asymmetrical and the molecule is polar.

In a laboratory investigation, a student separates colored compounds obtained from a mixture of crushed spinach leaves and water by using paper chromatography. The colored compounds separate because of differences in
a) molecular polarity
b) malleability
c) boiling point
d) electrical conductivity

Which phrase describes the motion and attractive forces of ideal gas particles?
a) random straight-line motion and no attractive forces
b) random straight-line motion and strong attractive forces
c) random curved-line motion and no attractive forces
d) random curved-line motion and strong attractive forces

At which temperature will Hg(l) and Hg(s) reach equilibrium in a closed system at 1.0 atmosphere?
a) 234 K
b) 273 K
c) 373 K
d) 630. K

A molecule of any organic compound has at least one
a) ionic bond
b) double bond
c) oxygen atom
d) carbon atom

A chemical reaction occurs when reactant particles
a) are separated by great distances
b) have no attractive forces between them
c) collide with proper energy and proper orientation
d) convert chemical energy into nuclear energy

Systems in nature tend to undergo changes toward
a) lower energy and lower entropy
b) lower energy and higher entropy
c) higher energy and lower entropy
d) higher energy and higher entropy

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