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3 years ago

Which method separates mixtures according to the rates their components travel through a material? yhaoo answers?

Chemistry

2 answers:

garik1379 [7]3 years ago

7 0

Answer: chromatography

Explanation:

Chromatography : It is a type of separation process in which the liquid or gas is separated into components at different rate.

It involves passing the mixture through a stationary phase, which separates the analyte to be measured from other molecules.This is possible because the components which get adsorbed to the stationary phase moves slowly with the mobile phase whereas the components which do not get adsorbed to the stationary phase move faster with the mobile phase.

Hence, chromatography is a laboratory technique that is used to separate mixtures according to the rates their components travel through a material

zhuklara [117]3 years ago

4 0

The hint you should note here is the 'travel through a material'. From this, you can think of separation techniques where the components have to go through a material. This could be filtration or membrane separation. However, in filtration, the rate is not a factor. You only have to separate solid from liquid. For membrane separation, you can separate two liquids based on their permeability to the membrane.

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How many times more basic is a solution with a pH of 10 than a solution with a pH of 8

lina2011 [118]

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3 years ago

If the container is closed and the ethanol is allowed to reach equilibrium with its vapor, how many grams of liquid ethanol rema

SVETLANKA909090 [29]

Explanation:

Let us assume that the given data is as follows.

V = 3.10 L, T = $19^{o}C$ = (19 + 273)K = 292 K

P = 40 torr (1 atm = 760 torr)

So, P = $\frac{40 torr}{760 torr} \times 1 atm$

= 0.053 atm

n = ?

According to the ideal gas equation, PV = nRT.

Putting the given values into the above equation to calculate the value of n as follows.

PV = nRT

$0.053 atm \times 3.10 L = n \times 0.0821 L atm/mol K \times 292 K$

0.1643 = $n \times 23.97$

n = $6.85 \times 10^{-3}$

It is known that molar mass of ethanol is 46 g/mol. Hence, calculate its mass as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

$6.85 \times 10^{-3} = \frac{mass}{46 g/mol}$

mass = $315.1 \times 10^{-3}$ g

= 0.315 g

Thus, we can conclude that the mass of liquid ethanol is 0.315 g.

4 0

3 years ago

What are the names of the stable forms of oxygen?

zloy xaker [14]

Answer:

18 O, 17 O, and 16 O

Explanation:

three naturally stable isotopes

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2 years ago

A patient arrives in the emergency with a burn caused by steam. Calculate the heat that released when 17.7 g of steam

MaRussiya [10]

The steam releases 39.9 kJ when it condenses..

The steam condenses and transfers its energy to the skin.

q = mΔH_cond = 17.7 g × (-2257 J/1 g) = -39 900 kJ = -39.9 kJ

The negative sign shows that the steam is releasing energy

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3 years ago

Decide which element probably has a boiling point most and least similar to the boiling point of cesium.

natka813 [3]

Answer:

Take a look at the attachment below

Explanation:

Take a look at the periodic table. As you can see, Rubidium is the closest element to Cesium, and happens to have the closest boiling point to Cesium, with only a difference of about 30 degrees.

Respectively, you would think that fluorine should have the least similarity to Cesium with respect to it's boiling point, considering it is the farthest away from the element out of the 4 given. This is not an actual rule, there are no fixed trends of boiling points in the periodic table, there are some but overall the trends vary. However in this case fluorine does have the least similarity to Cesium with respect to it's boiling point, a difference of about 1,546.6 degrees.

Hope that helps!

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3 years ago