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leonid [27]
3 years ago
7

Complete the statements by writing the number

Chemistry
1 answer:
dezoksy [38]3 years ago
3 0

Answer :

The substance is in the gas phase only in region  → 5

The substance is in both the liquid and the solid  phase in region  → 2

The substance is in only the liquid phase in region  → 3

The melting point is the temperature at region  → 2

The boiling point is the temperature at region → 4

Explanation :

Six phases of substance:

  • Melting or fusion : In this process the phase changes from solid state to liquid state at constant temperature.
  • Freezing : In this process the phase changes from liquid state to solid state at constant temperature.
  • Evaporation : In this process the phase changes from liquid state to gaseous state at constant temperature.
  • Condensation : In this process the phase changes from gaseous state to liquid state at constant temperature.
  • Sublimation : In this process the phase changes from solid state to gaseous state without passing through the liquid state at constant temperature.
  • Deposition : In this process the phase changes from gaseous state to solid state without passing through the liquid state at constant temperature.
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solution:

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Calculate the number of ammonia molecules in 3.9 g.
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(3.9 g)/ (17.03g/mol) = 0.22900763mols

Then convert the moles to molecules by multiplying it with Avogadro’s number:

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A plant extract can be obtained with organic solvents such as acetone or ethyl alcohol, and is composed of plant pigments such a
prohojiy [21]

Answer:

Here's what I get  

Explanation:

A plant extract is a mixture because it contains different substances: acetone or ethanol, chlorophylls A and B, carotene and xanthophylls.

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You can separate the pigments by paper, thin layer, or column chromatography.

Many schools use paper chromatography, because paper is cheap.

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mars1129 [50]

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Explanation:

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