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Answer:
reactants: 2 O2
products: 3 CO2, 4 NO2, 6 H2O
Explanation:
In a combustion, a combustible material, which generally is composed of C, H, O, N, and S, is combusted, that is, react with oxygen after a spark was produced; obtaining fire, heat and subproducts, including ashes and gases.
Oxygen is always one of the reactants of a combustion.
If Nitrogen was present in the combustible, NO2 (or other nitrogen oxides) will be produced.
If Carbon was present in the combustible, CO2 will be produced (also CO can be produced).
If Hydrogen was present in the combustible, H2O will be produced.
Answer:
False
Explanation:
We can see the colors of the rainbow, therefore they are visible.
Answer:
, zirconium-103.
Explanation:
In a nuclear reaction, both the mass number and atomic number will conserve.
Let 
represent the unknown particle.
The mass number of a particle is the number on the upper-left corner. The atomic number of a particle is the number on its lower-left corner under the mass number. For example, for the particle , 
is the mass number while 
while is the atomic number.
Sum of mass numbers on the left-hand side of the equation:
.
Note that there are three neutrons on the right-hand side of the equation. Sum of mass numbers on the right-hand side:
.
Mass number conserves. As a result,
.
Solve this equation for :
.
Among the five choices, the only particle with a mass number of 103 is . Make sure that atomic number also conserves.
