June 2010 Chemistry Regents #11-20
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|11 Which type of bond is found between atoms of solid
(1) nonpolar covalent (3) metallic
(2) polar covalent (4) ionic
|3||Cobalt is a metal so Metallic|
|12 Which equation represents sublimation?
(1) I2(s) ==> I2(g) (3) I2(l)==>I2(g)
(2) I2(s) ==>I2(l) (4) I2(l)==>I2(s)
|1||solid to a gas|
|13 Which sample of ethanol has particles with the highest
average kinetic energy?
(1) 10.0 mL of ethanol at 25°C
(2) 10.0 mL of ethanol at 55°C
(3) 100.0 mL of ethanol at 35°C
(4) 100.0 mL of ethanol at 45°C
|2||the highest temperature = (avg. KE)|
|14 The molarity of an aqueous solution of NaCl is defined
(1) grams of NaCl per liter of water
(2) grams of NaCl per liter of solution
(3) moles of NaCl per liter of water
(4) moles of NaCl per liter of solution
|4||Table T look it up|
|15 A real gas behaves least like an ideal gas under the
(1) low temperature and low pressure
(2) low temperature and high pressure
(3) high temperature and low pressure
(4) high temperature and high pressure
|2||ideal conditions are like ideal vacations high temperature and low pressure|
|16 Which sample of matter can be separated into different
substances by physical means?
(1) LiCl(aq) (3) NH3(g)
(2) LiCl(s) (4) NH3(l)
|1||(aq) is a homogeneous mixture of a substance and water|
|17 At STP, 1.0 liter of helium contains the same total
number of atoms as
(1) 1.0 L of Ne (3) 0.5 L of Rn
(2) 2.0 L of Kr (4) 1.5 L of Ar
|1||Avogadros Hypothesis- same volume under the same conditions of temp and pressure have the same # of molecules|
|18 Which statement describes the particles of an ideal
(1) The particles move in well-defined, circular paths.
(2) When the particles collide, energy is lost.
(3) There are forces of attraction between the particles.
(4) The volume of the particles is negligible.
|4||ideal gases never can form liquids so the volume is non existent or at low temps is would appear as a drop|
|19 A chemical reaction between iron atoms and oxygen
molecules can only occur if
(1) the particles are heated
(2) the atmospheric pressure decreases
(3) there is a catalyst present
(4) there are effective collisions between the particles
|4||definition of a reaction= effective collisions|
|20 Given the equation representing a phase change at
Which statement describes this equilibrium?
(1) The H2O(s) melts faster than the H2O(l) freezes.
(2) The H2O(l) freezes faster than the H2O(s) melts.
(3) The mass of H2O(s) must equal the mass of H2O(l).
(4) The mass of H2O(l) and the mass of H2O(s) each remain constant.
|4||equilibrium "con con requal"
rates are equal in both directions
the amount of each therefore remains the same
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