Option A can be eliminated by the elimination method. For example, a light bulb emits light without generating new substances. This is a physical change, not combustion, because combustion is a chemical change.
B. In chemical reactions Besides combustion which can release heat, there are also reactions between metals and water or acids, acid-base neutralization reactions and most chemical reactions which also release heat.
C. It is true that some chemical reactions absorb heat. For example, chemical reactions: most decomposition reactions, the reaction between carbon and carbon dioxide, the reaction between carbon and water vapor at high temperatures. the decomposition reaction of the calcium carbonate absorbs all the heat.
D. Not entirely. For example, hydropower, wind power, geothermal energymics, ocean energy, etc. are not energy obtained by combustion.
Then choose C.
| D |
| Sea sand contains salt, This will corrode steel bars in concrete, item A is correct; gutter oil contains a variety of toxic substances and its consumption is extremely harmful to the human body, element B is correct using solar energy, wind energy, etc. reduce CO 2 emissions, which is part of the logic of a “low carbon economy”, point C is correct; the greenhouse effect is linked to CO 2, point D is false; |