The air in a crewed spacecraft or submarine needs to be purified of exhaled carbon dioxide. write equations for the reactions between carbon dioxide and the following compounds. remember to include the states of all reactants and products in your equations.
(a) lithium oxide (li2o)(b) sodium peroxide (na2o2)

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Which element is least likely to undergo a chemical reaction