Allen is carrying out reactions in a lab. one of the products in all reactions is found to be either a precipitate, a gas, or water. what is common between all these reactions? select one of the options below as your a. they are all decomposition reactions. b. they are all combination reactions. c. they are all combustion reactions. d. they are all single-replacement reactions. e. they are all double-replacement reactions.

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.