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keidyhernandezm
12.10.2020 •
Chemistry
What indicates a chemical change?
O A. A change in the shape of a substance
O B. A change in volume
O C. A change from a liquid to a gas
O D. A change from one substance to another
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Ответ:
O D.A change from one substance to aonther
Explanation:
the formeashon on iron is a chemical change
Ответ:
Kerosene is lighter than water and so it floats on the water and continues to burn. Carbon (IV) oxide blankets the flame cutting off the supply of oxygen and extinguishing the fire.
Explanation:
As water is heavier than kerosene, it slips down permitting the kerosene to rise to the surface and continue to burn. Besides, the existing temperature is so high that the water poured on the fire would evaporate before it can extinguish the fire. Thus the kerosene fire cannot be extinguished with water.