State whether each of the following is a physical or a chemical change. (a) Zinc metal produces

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State whether each of the following is a physical or a chemical change. 

(a) Zinc metal produces a colorless gas in acid. 

(b) Nickel alloys with copper in a 5¢ coin. 

(c) Liquid helium boils at -269 °C. 

(d) Sodium metal reacts with chlorine gas.

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