22 At room temperature, which reaction would be expected to have the fastest reaction rate?
(1) Pb2+ (aq) + S2- (aq) → PbS(s)
(2) 2H2(g) + O2(g) → 2H 0(0)
(3) N2(g) + 202(g) → 2NO,(9)
(4) 2KC103(s) → 2KC1(s) + 30 (9

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

What overall charge must all compounds have

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?