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Why does an ionic compound (e.g. NaCl) conduct electricity when molten or dissolved in water, but not when it is a solid.

When an ionic compound is a solid, the ions in the ionic lattice are held together by ionic bonds. Due to this, the ions are not free to move around and so cannot carry a charge. When the ionic compound is m...
AH
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Is the excitation and de-excitation of an electron from the ground state (of an atom) due to the collision of another particle (e.g. electron) an elastic collision or an inelastic collision.

It is an elastic collision. This is because, when a particle collides with the electron of an atom, a discrete amount of energy is transferred from the particle to the electron. This discrete amount of energ...
AH
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Choose an example of a negative externality and explain one policy which may help to solve it.

Smoking, specifically tobacco, is an example of a negative externality in that it harms negatively those outside of the original transaction. For example, a person walking down a high street inhaling second ...
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Answered by Sam B. • Economics tutor
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What is a social class?

Social class is a way of categorising people according to certain qualities they may have, or conditions in their life. In the United Kingdom this can be things like your parents' jobs, what kind of educatio...
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Answered by Ciara C. • Sociology tutor
6104 Views

what is the critical period?

It is part of Bowlby's monotropic theory which states that during this first crucial period of 0-2 years, an infant should receive continuous care if strong secure attachments are going to be made. If an att...
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Answered by Amy T. • Psychology tutor
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