3 years ago

What makes a colloidal dispersion stable?

Chemistry

2 answers:

alexgriva [62]3 years ago

6 0

1.regulating ph
2.heating
3.adding some oppositely charged colloids

Sati [7]3 years ago

6 0

The addition of an emulsifier

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When the energy is passed on from one trophic level to another, only 10 percent of the energy is passed on to the next trophic level.

Explanation:

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D) physical and chemical changes

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NaCl has a Delta. Hfus = 30. 2 kJ/mol. What is the mass of a sample of NaCl that needs 732. 6 kJ of heat to melt completely? Use

tia_tia [17]

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

The heat of fusion has been the amount of heat required to convert 1 mole of substance into solid to liquid state.

The heat required has been given as:

$Q=m\Delta H$

<h3>Computation for the mass of NaCl</h3>

The given solution has heat of fusion, $\Delta H_{fus}=30.2\rm kJ/mol$

The heat required to melt the sample has been, $Q=732.6\;\rm kJ/mol$

Substituting the values for the mass of NaCl

$\rm 732.6\;kJ/mol=Mass\;\times\;30.2\;kJ/mol\\\\
Mass=\dfrac{732.6}{30.2}\;g\\\\
 Mass=24.3\;g\\$

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

Learn more about heat of fusion, here:

brainly.com/question/87248

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3 years ago

How many liters would you need to make a 0.8 M solution with 20 grams of lithium chloride?

worty [1.4K]

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0.5875L

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