Wnich action forms a different chemical substance?
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a
crushing a rock
b
burning a piece of wood
с
mixing salt and pepper
d
melting an ice cube

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

What are the two major rules associated with polarity

How to calculate the mass of copper