Kinetics Part 1

According to which theory or law is a chemical reaction most likely to occur when

two particles with the proper energy and orientation interact with each other?

• Collision Theory

• Atomic Theory

• Combined Gas Law

• Law of Conservation of matter

A chemical reaction occurs when reactant particles

• Convert chemical energy into nuclear energy

• Collide with proper energy and proper orientation

• Have no attractive forces between them

• Are separated by great distances

Entropy is a measure of

• The disorder of a system

• Accuracy

• Precision

• The attraction of a nucleus for an electron

Systems in nature tend to move towards

• Higher entropy

• Lower entropy

Answer explanation

Nature tends to move towards increased disorder. No matter how many times you clean your room it gets messy again

During which phase change does the entropy of a sample of water increase?

• Gas to liquid

• Gas to Solid

• Liquid to gas

• Liquid to solid

During which phase change does entropy decrease?

• Boiling

• Sublimation

• Freezing

• Melting

In chemical reactions, the difference between the potential energy of the

products and the potential energy of the reactants is equal to

• Heat of reaction

• Ionization energy

• Heat of Vaporization

• Activation Energy

Answer explanation

also known as enthalpy

H = PE(Products) - PE(Reactants)

Which mathematical expression represents the

heat of reaction (enthalpy) for a chemical change?

• (PE Products) x (PE Reactants)

• (PE Products)/

  (PE Reactants)

• (PE Products) +

  (PE Reactants)

• (PE Products) -

  (PE Reactants)

Systems in nature tend towards

• Higher Energy

• Lower Energy

Answer explanation

Boulder Rolls Downhill

Which of the following phase changes is exothermic?

• Boiling

• Melting

• Sublimation

• Condensing

Answer explanation

Energy is released as bonds form

B.A.R.F