Question

what is kinetic energy?
energy stored within the bonds of molecules.
energy that a substance has because of its motion.
the total amount of heat in a system.
the energy required to start a chemical reaction.

Explanation:

• Analyze each option:
• "Energy stored within the bonds of molecules" is chemical potential energy (like in chemical bonds), not kinetic energy.
• "Energy that a substance has because of its motion" matches the definition of kinetic energy (energy of motion).
• "The total amount of heat in a system" refers to internal energy or thermal energy concepts, not kinetic energy.
• "The energy required to start a chemical reaction" is activation energy, not kinetic energy.

Answer:

The option: "Energy that a substance has because of its motion." (the second option in the list)