At the end we stopped the distillation with some material left in the vial. Why is it considered unsafe to distill until dryness?

See the answer below

Explanation:

Distillation is a process of separating the contents of a liquid mixture by making use of the difference in the boiling temperatures of the components of the mixture. As the boiling point of each component is reached, it evaporates off and the vapor is condensed and collected to give a pure product.

It is never advisable to distillate to dryness because allowing the content of the distilling flask to dry up can cause heat to damage the flask or in some extreme cases, cause unintended chemical reactions that might alter the outcome of the experiment or cause laboratory accident.

The false option is C: remittance is actually the opposite: it's the money sent to the home country from the host country, so if the immigrant is from Guatemala and is working in the US, the remittance would go from US to Guatemala, not the other way round.