Ateacher wants to preform a class room demonstration that illustrates both chemical and physical changes. which would be the best demonstration she could use

D) burning a candle

Explanation

When burning a candle no new substance is form.

We have both physical and chemical change occuring.

Physical part: Melting of the solid wax and evaporation of the liquid forms the physical change.

Chemical part: burning of the wax vapour forms the chemical change.

Explanation:

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o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante