Which two substances can not be broken down by chemical change?

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1. 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

2007-11-29 09:58:09 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry

Number 2. These two are elements in their simplest form.

2007-11-29 10:01:51 · answer #1 · answered by qtpie831 4 · 0⤊ 0⤋

(3) and (4) You would have to catch the CO2 somehow and leave CuO behind.

2007-11-29 10:06:39 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋