Name: Freezing of Water
Uploaded: 2019-07-19
Duration: 3 min 31 s
Description: Freezing, also known as solidification, is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. Let's watch and study.

Question

How might physical and chemical changes help us to manipulate materials?

Accepted Answer

We are familiar with the fact, that how temperature changes lead to changes in physical state, and how this happens all the time to water in the environment.

We can use the change of state to separate mixtures because materials have different melting and boiling points. This means that we can use temperature to separate solutions, because increasing the temperature of the solution will cause the different materials in the solution to boil and separate, leaving behind the material with the highest boiling point (as long as we don’t raise the temperature that high). Of course, the situation becomes a little more complicated if the material we want to collect is the material that boils away first- as is the case if we wanted to collect the water evaporating from the salt pans during the production of salt from salty seawater. If we could collect the evaporated water, then we might be able to produce drinkable, pure water from undrinkable, salty seawater.

The process of heating a solution or mixture to separate out its component materials is called distillation. Distillation is used in all kinds of processes, for example in some countries it is used to separate out and purify the alcohol from solutions made through the process of fermentation, to produce strong alcoholic drinks. Fossil fuels such as gasoline, diesel or paraffin are separated out from crude oil using a similar process.

Thus, this is how physical and chemical changes might help us to manipulate materials.

How might physical and chemical changes help us to manipulate materials?

Important Questions on What Changes?

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