(Thinking about electronegativity differences, what type of bond would you predict to be formed between new elements located at the bottom of columns E and G?
(DOK 2)
Ionic because the difference in electronegativity is greater than 1.7 and element
E is a metal and bonds with G, a nonmetal to combine in a 1:1 ratio.
lonic because the difference in electronegativity is greater than 0.4, but less
than 1.7 and element E is a nonmetal and bonds with G, a metal to combine in a
1:1 ratio.
Nonpolar covalent because the difference in electronegativity is relatively small
and element Eis a metal and bonds with Ga nonmetal to combine in a 1:1 ratio.
Nonpolar covalent because the difference in electronegativity is greater than 1.7
and element Eis a metal and bonds with G, a nonmetal to combine in a 1:1 ratio.

  remember that hf is only the energy of one photon. not two. not three. one.  1) 5.12 * 10^3 photons  find the energy of one photon, then determine how many photons are needed to reach the sensitivity.  e = hf  = (6.626 * 10^-34 js)(5.95 * 10^19 hz)  = 3.94247 * 10^-14 j per photon  (2.02 * 10^-10 j) / (3.94247 * 10^-14 j/photon) = 5123.69149 photons  round to three sig figs.  2) 5.77 * 10^-17 j  energy of pulse = energy per photon * number of photons  = hfn  = (6.626 * 10^-34 js)(1.66 * 10^13 hz)(5250)  = 5.774559 * 10^-17 j  round to three sig figs.  3) 4.07 * 10^8 kj/mol  10^12 pm = 1 m  c = fλ  f = c/λ  e = hf  = hc/λ  = [(6.626 * 10^-34 js)(3.00 * 10^8 m/s) / (2.94 * 10^-12 m)](1 kj/1000 j)(6.02 * 10^23 photons/mol)  = 40702571.4 kj/mol  round to three sig figs.  4) 9.94 * 10^-1 m  e = hc/λ  λ = hc / e  = (6.626 * 10^-34 js)(3.00 * 10^8 m/s) / (2.00 * 10^-25 j)  = 0.9939 m  round to three sig figs.  5) 9.06 * 10^3 photons  energy of pulse = energy per photon * number of photons  number of photons = energy of pulse / energy per photon  = energy of pulse / (hf)  = (3.87 * 10^-13 j) / [(6.626 * 10^-34 js)(6.45 * 10^16 hz)]  = 9055.23695 photons  round to three sig figs.  6) 2.78 * 10^-15 j  this is problem 1, except in reverse.  sensitivity = minumum number of photons * energy per photon  = (5930)(6.626 * 10^-34 js)(7.077 * 10^14 hz)  = 2.78070758 × 10^-15 j  round to three sig figs.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood.