A. No new substances are generated during the wind energy production process. It is a physical change and does not use chemical reactions to obtain electrical energy.
B. No new substances are generated during the hydroelectricity production process. It is a physical change and does not use chemical reactions to obtain electrical energy.
C. Thermal power generation uses the heat released from burning coal, which is a chemical change. It converts chemical energy into electrical energy and uses the energy generated by chemical reactions.
D. No new substances are generated in the solar energy production process. It is a physical change and does not use chemical reactions to obtain electrical energy.
Then choose C.
Of the following energy conversions, chemical energy is convertie in electrical energy: ( ) A. Hydroelectric energy B. Thermal energy production C. Tidal energy production D. Wind energy
A. Hydropower uses the gravity of water to do work, converting gravitational potential energy into electrical energy without chemical changes;
The electrolysis of water is a chemical process that converts the electric energy. in chemical energy. The change does not meet the requirements for converting chemical energy into electrical energy;
B. The principle of solar water heater is to store the thermal energy of solar energy in water, which constitutes conversion. from solar energy to thermal energy. There are no chemical changes in the process;
C. When a light bulb is turned on and emits light, it is a process in which electrical energy is converted into heat energy and light energy. There are no chemicalse. changes;
D. Launching a space shuttle is done through fuel. The combustion releases energy to power the flight of the space shuttle. This energy is obtained from the chemical changes of fuel combustion;
So. choose D.
The main difference between physical changes and chemical changes is: whether other substances are generated; chemical changes not only generate new substances, but are also accompanied by energy changes, which are often expressed in thermal energy and light energy. . and the release or absorption of electrical energy. Therefore, the elimination method can be used to answer this question.
A. Hydroelectric production is the conversion of gravitational potential energy into electrical energy. This is a physical change that does not meet conversion requirements.on from chemical energy to electrical energy; B. Thermal energy production is produced by the combustion of combustible materials. The conversion of energy into electrical energy is a chemical change and meets the requirements of converting chemical energy into electrical energy;
C. to convert tidal energy into electrical energy, which is a physical change and does not meet the requirements of converting chemical energy into electrical energy;
D. Wind power generation is the conversion of wind. potential energy to electrical energy, which is a physical change and does not meet the requirements of converting chemical energy into electrical energy;
So choose B.