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

1.solid

2.carbon dioxide

3.helium

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.