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Ivenika [448]
3 years ago
8

!30 Points!

Chemistry
1 answer:
vfiekz [6]3 years ago
4 0

Answer:

I have an image that should help you!

Explanation:

Hope this helps you!

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A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a____. it for science class
Shkiper50 [21]
The heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is colloid. Because colloid has particles that are small enough to suspended but are as large that they can scatter light.
8 0
3 years ago
Which two physical properties allow a mixture to be separated by chromatography
Slav-nsk [51]

Answer:


                 Option-1 (Solubility and Molecular polarity) is the correct answer.


Explanation:


                        Thin Layer Chromatography is employed to separate a mixture of non volatile compounds. In this technique an adsorbent material like silica gel is coated on a plastic, glass or aluminium sheet. Then the mixture of compounds is applied at the bottom of sheet and the sheet is placed in the container containing a solvent system. It is observed that the solvent starts travelling upward through capillary action.


While the solvent is running the mixture of compounds starts separating from each other. This separation is due to following physical properties.


1) Solubility of Mixture in Solvent:

                                                          In a mixture those compounds which has more solubility in solvent will travel more and will give greater Rf value and the less soluble will left behind with smaller Rf value. Hence due to solubility a mixture of compounds can be separated.


2) Polarity of Molecules:

                                          As the stationary phase (adsorbent material) is polar in nature, so in mixture those compounds which are less polar will less interact with the stationary phase and will travel more with greater Rf value, while, more polar molecules will form stronger interactions with the stationary phase, hence will travel less and therefore, will show smaller Rf values.


6 0
3 years ago
Mercury is often used as an expansion medium in a thermometer. The mercury sits in a bulb on the bottom of the thermometer and r
postnew [5]
Ok yeah a ha yeah wow it is 13.543 g/× compare that with e 13.5
3 0
3 years ago
An endothermic solution process is described by which of the following?
Temka [501]

Answer:

a. ΔΗ > 0, solution feels cold

Explanation:

Hello,

In this case, endothermic process are those in which we can find that the products have more energy than the reactants, therefore energy is absorbed, for which the following equation:

\Delta H=\Delta H_{products}-\Delta H_{reactants}

Must be greater than 0 (positive) thereby, for a solution process we find that the solution feels cold, in such a way, answer is a. ΔΗ > 0, solution feels cold.

Regards.

4 0
3 years ago
The impact of fossil fuel combustion on the global carbon cycle
olga_2 [115]
When humans burn fossil fuels, the stored carbon is released into the atmosphere as carbon dioxide. The carbon is then free to cycle through the Earth and can upset the natural balance of the carbon available, changing the way that processes occur on Earth.
8 0
3 years ago
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