Physical Change because a new substance was not created and if it was a chemical change, a new substance would have to be created.
The answer lies in the concept of quantum mechanics. Every single electron of an atom has its own unique set of quantum numbers. It is stated in the Pauli Exclusion principle that no two electrons would have the same quantum numbers. That is why each electron occupies a specific orbital. In addition to the Pauli Exclusion Principle, the other laws and principles that help set the quantum numbers are the Aufbau Principle and the Hund's rule.
Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecules by Hydrogen bonds.
Hydrogen Bond
Between a hydrogen (H) atom that is covalently bonded to a more electronegative "donor" atom or group and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor—a hydrogen bond (or H-bond) forms (Ac). The second-row elements fluorine, oxygen, and nitrogen are the most common donor and acceptor atoms (F).
It may take place either intramolecularly or intermolecularly (between different molecules) (occurring among parts of the same molecule). The energy of a hydrogen bond can range from 1 to 40 kcal/mol and is influenced by the shape, surroundings, and nature of the particular donor and acceptor atoms.
To learn more about the hydrogen bond refer here:
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<span>This problem is not about chemistry it is about math. the half-life of a certain thing is the time that it needs to decay 50% of what it had before. so if there is 4g, after 1 half there will be only 2g. so to become 1g it is passed 2 half-lives. 4,0g, 2,0g, 1,0g so it is the time divided by 2( numbers of half-lives). So the half-life of Francium 210 is 2,6 min.</span>
The correct answer is a Forward reaction to slow.
According to Le Chatelier's principle as the reactant decrease so the reaction should go leftward and this is called backward or reverse reaction so the reverse reaction will be fast to achieve equilibrium and the forward reaction will be slow.
