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3 years ago

b. Describe how the temperature changes within a phase and during a phase change as heat is added to a water sample. (2 points)

1 answer:

6 0

Hello!

Take for example the heating of water.

When heating liquid water from room temperature (25 °C) to the boiling point (100 °C), adding heat results in a direct increase in the temperature. This kind of heat is called sensible heat, because we can sense the effect of the added energy.

But when you reach 100 °C, there is a phase change from liquid to vapour, and the added heat is used to produce the phase change, and no increase in temperature is observed, only the phase change. This kind of heat is called latent heat.

Have a nice day!

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A chemical change involves a change in ________. A chemical change involves a change in ________. phase the elements of a molecu

Firlakuza [10]

Answer:

All of the above.

Explanation:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

This process is not reversible and a change of energy that is sometimes heat is given off.

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3 years ago

Describe two tests that you can run to determine if something is a substance or a mixture.

ryzh [129]

The difference between a substance and a mixture is that a substance is one of a kind, a material of the same composition throughout, on the contrary, a mixture is one or more different substances brought together and mixed together without changing the nature of each single substance.

One way to test it is to take two substances like sand and table salt. They should each be in granular form and in adequate amount to mix. Neither substance has changed after mixing the two. Even though it may not be easy or convenient to accomplish, each substance could be separated out from the mixture.

When it comes to two substances in lump form, it would not be a mixture when one lump is positioned next to the other lump because there are not enough pieces to combine.

However, there could be a mixture of three substances, like sand, table salt and graphite powder and there could be a mixture with four substances, etc., ad infinitum.

Mixtures are of solid substances in general. On the other hand, one starts referring to solutions when liquids are involved. Gases can be a mixture like for example, air is a mixture with nitrogen, oxygen, argon, etc.

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3 years ago

Name the process which takes place when

Lady_Fox [76]

Explanation:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.

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3 years ago

Read 2 more answers

Match the following terms:

AURORKA [14]

Answer:

See below ~

Explanation:

A to B

⇒ Solid Phase

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B to C

⇒ Melting

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C to D

⇒ Liquid Phase

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D to E

⇒ Vaporizing

============================================================

E to F and beyond

⇒ Gas Phase

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2 years ago

Why the bond in water molecule os polar covalent bond, while than in chlorine molecule is pure covalent bond? Give reason?

erastovalidia [21]

Explanation:

The unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that a water molecule has two poles - a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side). We say that the water molecule is electrically polar.

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