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Which two substances can not be broken down by chemical change? (1) C and CuO (3) CO2 and CuO (2) C and Cu (4) CO2 and Cu

Which two substances can not be broken down by chemical change? (1) C and CuO (3) CO2 and CuO (2) C and Cu (4) CO2 and Cu
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Which two substances can not be broken down by chemical change?

(1) C and CuO (3) CO2 and CuO
(2) C and Cu (4) CO2 and Cu

User Brynbodayle
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C and Cu cannot be broken down by chemical change.
User Kim Schroeder
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