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The only sure evidence of a chemical reaction is...

The production of a new material

A color change

The formation of a gas

A change in physical properties

Ibelieve it's celsius. hope this .

Olá. porque a reação na temperatura é muito rapida a do copo : )

Answerit curves up and levels out.explanationwe assume that the container contains absolutely no ammonia to begin with as it states that "nitrogen gas and hydrogen gas" react to "produce ammonia."at dynamic equilibrium, the product and reactant concentrations are equal.this means that, starting from a concentration of zero, [nh₃] must curve "up" from zero and then level out to a constant concentration.