June 2017 Chemistry Regents Questions 11-20 Question Preview (ID: 59773)


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.

What is the number of electrons shared between the atoms in an I 2 molecule?
a) 7
b) 2
c) 8
d) 4

Which substance has nonpolar covalent bonds?
a) Cl2
b) SO3
c) SiO2
d) CCl4

Compared to a potassium atom, a potassium ion has
a) a smaller radius
b) a larger radius
c) fewer protons
d) more protons

Which form of energy is associated with the random motion of particles in a gas?
a) chemical
b) electrical
c) nuclear
d) thermal

The average kinetic energy of water molecules decreases when
a) H2O(ℓ) at 337 K changes to H2O(ℓ) at 300. K
b) H2O(ℓ) at 373 K changes to H2O(g) at 373 K
c) H2O(s) at 200. K changes to H2O(s) at 237 K
d) H2O(s) at 273 K changes to H2O(ℓ) at 273 K

The joule is a unit of
a) concentration
b) energy
c) pressure
d) volume

Compared to a sample of helium at STP, the same sample of helium at a higher temperature and a lower pressure
a) condenses to a liquid
b) is more soluble in water
c) forms diatomic molecules
d) behaves more like an ideal gas

A sample of a gas is in a sealed, rigid container that maintains a constant volume. Which changes occur between the gas particles when the sample is heated?
a) The frequency of collisions increases, and the force of collisions decreases.
b) The frequency of collisions increases, and the force of collisions increases.
c) The frequency of collisions decreases, and the force of collisions decreases.
d) The frequency of collisions decreases, and the force of collisions increases.

At STP, which gaseous sample has the same number of molecules as 3.0 liters of N2(g)?
a) 6.0 L of F2(g)
b) 4.5 L of N2(g)
c) 3.0 L of H2(g)
d) 1.5 L of Cl2(g)

Distillation of crude oil from various parts of the world yields different percentages of hydrocarbons. Which statement explains these different percentages?
a) Each component in a mixture has a different solubility in water.
b) Hydrocarbons are organic compounds.
c) The carbons in hydrocarbons may be bonded in chains or rings.
d) The proportions of components in a mixture can vary.

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