Chemistry help please

Chemistry

1 answer:

Lerok [7]4 years ago

5 0

balanced chemical equation:

2 Na + Cl₂ → 2 NaCl

Explanation:

We have the following chemical reaction:

Na (s) + Cl₂ (g) → NaCl (s)

where:

(s) - solid

(g) - gas

To balance the equation the number and type of atoms entering the reaction have to be equal to the number and type of atoms leaving the reaction.

2 Na (s) + Cl₂ (g) → 2 NaCl (s)

2 Na atoms are entering the reaction 2 Na atoms are leaving the reaction

2 Cl atoms are entering the reaction 2 Cl atoms are leaving the reaction

Learn more about:

balancing chemical equations

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Answer:

The correct answer is B) it helps to ensure the result are consistent and repeatable.

Explanation:

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sveticcg [70]

Answer: The last electron will be filled in first orbital of 3p sub-shell.

Explanation: Filling of electrons in orbitals is done by using Hund's Rule.

Hund's rule states that the electron will be singly occupied in the orbital of the sub-shell before any orbital is doubly occupied.

For filling up of the electrons in Sulfur atom having 16 electrons. First 10 electrons will completely fill according to Aufbau's Rule in 1s, 2s and 2p sub-shells and last 6 electrons are the valence electrons which will be filled in the order of 3s and then 3p.

3s sub-shell will be fully filled and the orbitals of 3p sub-shell will be first singly occupied and then pairing will take place. Hence, the last electron will be filled in the first orbital of 3p-sub-shell.