A manufacturer is checking a batch of brass fittings used in water taps. Fig. 1 shows a simplified particle model of the solid. Copper atoms are shown as un...
Question 1 Report
A manufacturer is checking a batch of brass fittings used in water taps. Fig. 1 shows a simplified particle model of the solid. Copper atoms are shown as unshaded circles and zinc atoms as black circles. The fittings are hard and do not have a fixed chemical formula. Brass is melted and poured into moulds to make the final product.
(a) Which type of substance is brass: an element, a compound or a mixture? [1]
(b) Give the names of the two elements in brass. [2]
(c) State why brass is not a compound. [1]
Answer Details
(a) Brass is a mixture, specifically an alloy. [1]
(b) The two elements are copper and zinc. [2]
(c) Brass is not a compound because copper and zinc are not chemically combined in a fixed ratio. Its composition can vary, so it has no fixed chemical formula. [1]
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