Final answer:
Electricity is generated when electrons move through matter, and in chemical changes, energy is gained or lost. In engines, controlled explosions of gasoline with oxygen provide the necessary power.
Step-by-step explanation:
Electricity is caused when electrons run through matter. The correct answer to the first question is D) Electrons. Every day, we use electricity in various forms, like powering devices and appliances, by moving electrons through a wire and harnessing their energy. Notably, in electrochemical cells, or batteries, electricity is the result of oxidation-reduction reactions where the exchange of electrons occurs.
Whenever something changes chemically, energy is gained or lost. The correct answer to the second question is C) Energy. This is because atoms can form chemical bonds—either by gaining, losing, or sharing electrons—and the breaking and forming of these bonds involve the transfer of energy, typically manifesting as heat.
Car and motorcycle engines are controlled by chemical reactions combining gasoline with oxygen, essentially small explosions. Thus, the answer to the third question is C) Explosions. These explosions happen in the engines' combustion chambers, releasing energy that propels the vehicle.