78.37 °C
It mean , ethanol, with a molecular weight (MW) of 46, has a boiling point of 78 °C (173 °F), whereas propane (MW 44) has a boiling point of −42 °C (−44 °F).
Answer : When the nuclear reaction produces too many neutrons.
Explanation : In a nuclear fission reactor where the reaction is controlled by regulating the number of neutrons produced by the chain reaction. Production of too many neutrons may cause an accelerated uncontrolled chain reaction which may cause enormous heat to be generated in a very short period of time inside the reactor which may result into an explosion.
For, this purpose control rods, made of neutron absorbing species, like cadmium, are placed in the nuclear reactors to control the excess number of neutrons at any point of reaction when required.
like what are they made of? if so iron, due to iron oxide appearing as red hence why mars is red
Answer: Elements in the last period are radioactive.
Explanation:
A) - this is false: atoms are indivisible according to his theory
b) - this is false: just as in the previous point, the reason is that atoms are indivisible according to his theory
c) no, not true
d) - this is true: atoms of the same element are identical according to the theory