hafsazunair hafsazunair

03-12-2020
Chemistry

contestada

can copper be scratched by a fingernail or blade knife. why?

Respuesta :

M7mdnja M7mdnja

03-12-2020

Answer:

it could by blade knife

Explanation:

fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5

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