A. During the process of producing thermal energy, new substances such as carbon dioxide are generated, which constitutes a chemical change.
B. The process of producing hydropower is only an energy conversion, no new substances are generated, and it is a physical change.
C. The wind power production process is only an energy conversion, no new matter is generated, and it is a physical change.
D. The geothermal energy production process is only an energy conversion, no new substances are generated, and it is a physical change.
Then choose A.
Of the following uses of water, water has undergone chemical changes: ( ) A. Used industrially for washing, dissolving, heating and cooling B. Hydroelectric production C
A. Hydroelectric generation uses the gravity of water to effectwork, converting gravitational potential energy into electrical energy without chemical modifications;
The electrolysis of water is a conversion of electrical energy. in chemical energy Chemical 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 chemicals. 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 changes chimics of fuel combustion;
So. choose D.
A. When industrial water is used for washing, dissolving, heating and cooling, no new substances are generated, which constitutes a physical change.
B. The process of producing hydropower is only an energy conversion, no new substances are generated, and it is a physical change.
C. In the process of manufacturing chemical fertilizers using water as a raw material, new substances are generated, which constitutes a chemical change.
D. No new substances are generated during the process of irrigating fields in agriculture, which is a physical change.
Then choose: C.