Which of the following is a combustion reaction? a а
Fe (s) + S (s) --→ FeS
b
ZnS + O2 → Zn2O + SO2
c с
Ca + 2H20 + Ca(OH)2 + H2
d
C₂H4 + O2 CO2 + H₂O

There are 6.022 x 10^23 atoms of hg in 1 mole of hg. the number of atoms in 4.5 moles of hg can be found by multiplying 4.5 by 6.022 x 10^23 a. 2.7 x 10^24 b. 27 x 10^23 c. 2.71 x10^24 d. 27.099 x 10^23

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

The bohr model of the atom explained why emission spectra are discrete. it could also be used to explain the photoelectric effect. which is a correct explanation of the photoelectric effect according to the model?