In any redox reaction, the substance that undergoes reduction will
(1) lose electrons and have a decrease in oxidation number
(2) lose electrons and have an increase in oxidation number
(3) gain electrons and have a decrease in oxidation number
(4) gain electrons and have an increase in oxidation number

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Which statement best identifies the process shown? the process must be fusion because energy is released. a.the process must be fusion because a heavier nucleus forms from smaller nuclei. b.the process must be fission because a large nucleus breaks into smaller nuclei. c.the process must be fission because neutrons are formed.

Amole, which is a unit in chemistry, contains 6.02 x 1023 atoms or particles. how many zeroes follow the 2 when this number is written out in standard form? a) 21 b) 23 c) 24 d) 25