The following substances burn in oxygen, and Mars radiates all around to form black solid () A. Iron wire B. red phosphorus C. alcohol D. charcoal

The following substances burn in oxygen, and Mars radiates all around to form black solid () A. Iron wire B. red phosphorus C. alcohol D. charcoal

When iron burns in oxygen, it will spark and form black solid; when red phosphorus, alcohol, charcoal and other substances burn in oxygen, they will not spark and form black solid

The chemical equation of carbon dioxide and water produced by ethanol combustion in oxygen is used to calculate the mass ratio of each substance in the reaction
The chemical formula of ethanol is c2h6o

Alcohol (ethanol) combustion: C2H5OH + 3O2 = ignition = 2co2 + 3H2O
Phenomenon: blue flame, water droplets on the inner wall of beaker, clear lime water turbid

Write out the chemical equation for the reaction of ethanol (C2H5OH) and oxygen to produce carbon monoxide, carbon dioxide and water

2C2H5OH+5O2=2CO2+2CO+3H2O

I want cm squared and DM squared, m squared unit conversion

The rate of progress is 100%

Is it that the gravity of a celestial body with high density will be great? Why? Is there any formula?

Law of gravitation:
F (Citation)
= GMm/r^2
= Gp*(4Pi*r^3/3)m/r^2
= (4/3)mG*Pi*pr
Among them:
F is the gravitational force on the surface of celestial bodies
G gravitational constant, Pi Pi
M mass of the object being attracted
P is the density of celestial bodies, R is the radius of celestial bodies
It is easy to know: the higher the density and radius of a celestial body, the stronger the gravitational field on its surface