In the reaction below, iodine gas, I2 (g), is violet in color, while hydrogen gas, H2 (g), and hydrogen iodide, HI(g), are both colorless. When H2 (g) and I2 (g) are combined in a closed flask, the violet gas never disappears completely. Which of the following explains this observation? H2 (g) + I2 (g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. 2HI(g) (1 point) The forward reaction, H2 (g) + I2 (g) yields 2HI (g), is proceeding too slowly for any HI (g) to form. The reverse reaction, 2HI (g) yields H2 (g) + I2 (g), is occurring at the same rate as the forward reaction. The product of the original reaction is reacting with the I2 (g), forming a gas with properties similar to I2 (g). The reaction has reached completion, and H2 (g) was the limiting reactant, leaving unreacted I2 (g) behind.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.