Answer:
Cutting the supply of oxygen
Explanation:
We know that a thing need three things to burn
- Oxygen
- Heat
- flammable object .
Co_2 stops oxygen supply so fire gets extinguished
Answer:
10.5 moles of Nitrogen gas is produced
Explanation:
Number of moles = mass / molar mass
molar mass of Nitrogen = 14g/mol
mass produced= 147g
moles= 147/14= 10.5moles of Nitrogen gas produced
Answer:
Green, Blue, Indigo, Violet
Explanation:
According to Einstein's equation of photoelectric effect, the kinetic energy of emitted photoelectron is the difference between the energy of the incident photon and the work function of the metal. The work function of the metal referee to the minimum energy that must be supplied in order to eject an electron from a metal surface. The energy of the incident photon must exceed the work function of the metal.
When we look at the electromagnetic spectrum, only the selected colours have frequency above the threshold frequency as shown by the image attached below.
The answer "formation of a precipitate" it is correct.
Explanation:
In a double-displacement two reactants will exchange atoms or group of atoms between themselves to form the products. Generally we can write the reaction as following:
AB + CD → AC + BD
Of course to drive the chemical reaction to the right, one of the products have to be a precipitate.
As example we have the chemical reaction of sodium chloride (NaCl) with silver nitrate (AgNO₃):
NaCl (aq) + AgNO₃ (aq) → NaNO₃ (aq) + AgCl (s)
where:
(aq) - aqueous
(s) - solid
Learn more about:
types of chemical reactions
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