Exploring the Basics of Thermochemistry

What does temperature measure in a substance?

• The total energy of the particles

• The average kinetic energy of the particles

• The potential energy of the particles

• The mass of the particles

What happens to molecular motion at 0 Kelvin?

• It speeds up

• It reverses direction

• It remains constant

• It stops completely

What does doubling the Kelvin temperature do to the average kinetic energy?

• Quadruples it

• Doubles it

• Does not change it

• Halves it

What does a Maxwell Boltzmann distribution illustrate?

• The velocity of particles at a given temperature

• The mass of particles in a reaction

• The potential energy distribution in a substance

• The color of particles at different temperatures

What does the law of conservation of energy state?

• Energy is always conserved in a reaction

• Energy can only be transformed in a physical change

• Energy can be created and destroyed

• Energy is not important in chemical reactions

What is the main focus of thermochemistry?

• Temperature changes in reactions

• The creation of new elements

• Energy changes during chemical reactions

• The destruction of chemical bonds

What is chemical potential energy?

• Energy absorbed by forming chemical bonds

• Energy released by breaking chemical bonds

• Energy stored within chemical bonds

• Kinetic energy of chemical reactions

What happens when bonds are formed in a chemical reaction?

• Energy is absorbed

• Energy is ignored

• Energy is created

• Energy is released

How is heat transferred between two objects?

• From the warmer to the cooler object

• Equally in both directions

• From the cooler to the warmer object

• Heat is not transferred between objects

What indicates that thermal equilibrium has been reached?

• The objects are at different temperatures

• The kinetic energy is transferred completely

• The objects have the same average kinetic energy

• Heat flow stops completely