Which of the following reactions shows a chemical change producing a gas? A. 2AgNO3(aq) + CaBr2(aq) + 2AgBr(s) + Ca(NO3)2(aq)
B. H2(g) + O2(g) → H20(1)
C. 2CH2OH() + 302(g) → 2002(g) + 4H20()
D. NaCl(s) → NaCl(aq)

1.solid

2.carbon dioxide

3.helium

answer; talc and gypsum;

it was spontaneous.

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