Select all that apply.

which of the following techniques have been employed to improve the efficiency of fireplaces?
addition of catalytic combustors
addition of boilers
use of masonry
use of venting systems

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

The activation energy for a(n) is quite large and usually takes extra energy from the environment, it is normally not a natural spontaneous process. combustion reaction endothermic reaction exothermic reaction catalyzed reaction

The approximate distance from earth to the moon is 240 thousand miles. the approximate distance from earth to the sun is 93 million miles. in standard notation, the approximate distance from the sun to earth is miles greater than the approximate distance from earth to the moon. in scientific notation, the distance is m × 10n, where m is and n is .