January 2019 Chemistry Regents Questions 11-20 Question Preview (ID: 59733)


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.

Which term represents the sum of the atomic masses of the atoms in a molecule?
a) atomic number
b) mass number
c) formula mass
d) percent composition by mass

Which equation represents energy being absorbed as a bond is broken?
a) H + H → H2 + energy
b) H + H + energy → H2
c) H2 → H + H + energy
d) H2 + energy → H + H

Which term is used to describe the attraction that an oxygen atom has for the electrons in a chemical bond?
a) alkalinity
b) electronegativity
c) electron configuration
d) first ionization energy

Which substance can not be decomposed by chemical means?
a) C
b) CO
c) CO2
d) C3O2

A beaker contains a dilute sodium chloride solution at 1 atmosphere. What happens to the number of solute particles in the solution and the boiling point of the solution, as more sodium chloride is dissolved?
a) The number of solute particles increases, and the boiling point increases.
b) The number of solute particles increases, and the boiling point decreases.
c) The number of solute particles decreases, and the boiling point increases.
d) The number of solute particles decreases, and the boiling point decreases.

Which form of energy is transferred when an ice cube at 0°C is placed in a beaker of water at 50°C?
a) chemical
b) electrical
c) nuclear
d) thermal

The average kinetic energy of the particles in a sample of matter is expressed as
a) density
b) volume
c) pressure
d) temperature

At STP, which gas sample has the same number of molecules as 2.0 liters of CH4(g) at STP?
a) 1.0 liter of C2H6(g)
b) 2.0 liters of O2(g)
c) 5.0 liters of N2(g)
d) 6.0 liters of CO2(g)

Which phrase describes this change?
a) endothermic chemical change
b) endothermic physical change
c) exothermic chemical change
d) exothermic physical change

Which term identifies a factor that will shift a chemical equilibrium?
a) atomic radius
b) catalyst
c) decay mode
d) temperature

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