Ascientist has found two samples of radioactive material. the first sample has a mass of 1.0 g and an activity of 2.0 mc022-1.jpg 109 decays per second (d/s). the second sample has an activity of 3.0 mc022-2.jpg 109 d/s. according to the curies’ findings, what is the mass of the second sample?
1.0 g1.5 g5.0 109 g6.0 1018 g

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.