Which equations are balanced, and how can the non-balanced ones be balanced? B. ___ H2O + ___ SO3  ___ H2SO4
C. ___ KI + ___ Cl2  ___ KCl + ___ I2
D. ___ NaHCO3  ___ Na2CO3 + ___ H2O + ___ CO2
E. ___ Zn + ___ HCl  ___ ZnCl2 + ___ H2
F. ___ BaCl2 + ___ Na2SO4  ___ BaSO4 + ___ NaCl
G. ___ C3H8 + ___ O2  ___ CO2 + ___ H2O
H. ___ Al + ___ CuCl2  ___ AlCl3 + ___ Cu

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

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as