Answered

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En el experimento mostrado, ¿Cuál de las afirmaciones
corresponde a un cambio químico?
Cuando los gases de combustión se ponen en
contacto con el oxígeno
Cuando la vela se derrite
Cuando la vela se pone en contacto con el oxígeno
Cuando el oxígeno se pone en contacto con la
parafina y el calor de la llama de la vela

Sagot :

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