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3 years ago

HELPPP What method should you use to separate this sample of mixture?

Chemistry

1 answer:

kozerog [31]3 years ago

8 0

Answer:

The answer to your question is: D. Fractional distillation

Explanation:

A. Column chromatography this method is use to separate mixtures base in its capacity to be absorbed.

B. Fractional crystallization this method use the solubility of solutes in a solvent.

C. Simple distillation is a method to separate 2 liquids based on the difference in their boiling points.

D. Fractional distillation is a method used to separate a mixture of liquids which have their boiling points very close.

E. Paper chromatography is a method to separate a mixture based on their different rate of migration on a paper.

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Dark silicates have a specific gravity of 3.2 to 3.6 and are composed primarily of silica tetrahedral and ________. Select one:

ch4aika [34]

The answer is option e that is e. Iron and magnesium.

Dark silicates have a specific gravity of 3.2 to 3.6 and are composed primarily of silica tetrahedral and iron and magnesium.

Iron and magnesium is a component of dark silicates that have a specific gravity of 3.2 to 3.6.

So the answer is iron and magnesium.

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3 years ago

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If you trace back the history of a carbon atom in your little finger through all of cosmic history, where did this atom most lik

Kamila [148]

Answer:

It was fused from 3 helium nuclei in the core of a red giant star long before the Sun existed

Explanation:

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3 years ago

The total mass of the reactants is ________ the total mass of the products in a chemical reaction.

jonny [76]

Answer:

The total mass of the reactants is <u>equal to </u> the total mass of the products in a chemical reaction.

Explanation:

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3 years ago

Why do scientist study volcanos!!

agasfer [191]

Answer:

Volcanologists use many different kinds of tools including instruments that detect and record earthquakes (seismometers and seimographs), instruments that measure ground deformation (EDM, Leveling, GPS, tilt), instruments that detect and measure volcanic gases (COSPEC), instruments that determine how much lava is moving underground (VLF, EM-31), video and still cameras, infrared cameras, satellite imagers, webcams, etc!

Explanation:

I HOPE IT HELPED

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3 years ago

EXTRA POINTSSS 1. A solution at 25 degrees Celsius is 1.0 × 10–5 M H3O+. What is the concentration of OH– in this solution?

AlekseyPX

Answer:

Concentration of OH⁻:

1.0 × 10⁻⁹ M.

Explanation:

The following equilibrium goes on in aqueous solutions:

$\text{H}_2\text{O}\;(l)\rightleftharpoons \text{H}^{+}\;(aq) + \text{OH}^{-}\;(aq)$ .

The equilibrium constant for this reaction is called the self-ionization constant of water:

$K_w = [\text{H}^{+}]\cdot[\text{OH}^{-}]$ .

Note that water isn't part of this constant.

The value of $K_w$ at 25 °C is $10^{-14}$ . How to memorize this value?

The pH of pure water at 25 °C is 7.
$[\text{H}^{+}] = 10^{-\text{pH}} = 10^{-7}\;\text{mol}\cdot\text{dm}^{-3}$
However, $[\text{OH}^{-}] = [\text{H}^{+}]=10^{-7}\;\text{mol}\cdot\text{dm}^{-3}$ for pure water.
As a result, $K_w = [\text{H}^{+}] \cdot[\text{OH}^{-}] = (10^{-7})^{2} = 10^{-14}$ at 25 °C.

Back to this question. $[\text{H}^{+}]$ is given. 25 °C implies that $K_w = 10^{-14}$ . As a result,

$\displaystyle [\text{OH}^{-}] = \frac{K_w}{[\text{H}^{+}]} = \frac{10^{-14}}{1.0\times 10^{-5}} = 10^{-9} \;\text{mol}\cdot\text{dm}^{-3}$ .

8 0

3 years ago