Advanced Chemistry MC Test (Unit 1: Combustion)

This energy is the work done by a force acting through a distance and involves motion.

• Kinetic

• Enthalpy

• Entropy

• Macroscopic energy.

• Nuclear potential energy

This describes the amount of energy in a system

• Kinetic

• Entropy

• Macroscopic energy

• Enthalpy

• Nuclear potential energy

This discribes the amount of disorder

• Entropy

• Kinetic

• Enthalpy

• Macroscopic energy

• Nuclear potential energy

This energy can be seen in the form of motion or heard as sound is classified as

• Nuclear potential energy

• Kinetic

• Enthalpy

• Macroscopic energy

• Entropy

This energy is stored within the particles of an atom’s nucleus

• Entropy

• Nuclear potential energy

• Enthalpy

• Macroscopic energy

• Kinetic

Many sources of energy, such as nuclear, coal, and oil, use a fuel source to turn water into steam. The steam is then used to turn a turbine and generate electricity. These sources are not very efficient, because–

• turbines have a significant amount of friction.

• it is difficult to directly measure electrical energy.

• a certain percentage of the heat energy is wasted and not able to be converted into electricity.

• much of the fuel source does not get converted into heat energy.

At the microscopic level, manifestations of energy can be modeled as a combination of energy associated with which of the following?

• The masses of the atoms of all objects involved in energy transfer

• The motion of particles and the energy associated with their positions

• Vibrations caused by thermal energy used and lost to the environment

• The strong and weak nuclear forces between atoms of the system

A system being studied is classified as an open system. Transferred out of the system is 30 J of energy. The energy is converted to heat, mechanical, and electrical energy. If mechanical energy measured 10 J and electrical energy measured 5 J, how many joules were converted to heat energy?

• 5J

• 15J

• 10J

• 45J

Which of the following most accurately describes the current understanding of energy and mass in reactions?

• The greater the mass of all the components of any system is, the greater the amount of energy it can generate.

• As the energy of a system increases, so does the molecular motion of all parts of the system.

• Energy and mass can never be created or destroyed; they can only be transferred between systems.

• Energy can only be exchanged between systems that are in direct physical contact with each other.

Law of conservation of mass

• Minimum amount amount of energy required for a reaction to proceed

• States that the total number of atoms of each element is not changed during a chemical reaction

• Representation of the number and types t of atoms in a compound

• The potential of a chemical substance to undergo a transformation through a chemical reaction