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3 years ago

What is the freezing point of a .743 m aqueous solution of KCl

Chemistry

1 answer:

marysya [2.9K]3 years ago

3 0

Change in freezing point = -1.86 C/m X 0.743 m X 2 = -2.76 C

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How is impure copper refined by electrolysis

Gelneren [198K]

Answer:

By giving electricity to copper compound solution.

Explanation:

Electrolysis is one of the major way of refined copper. The copper containing solution has two electrodes.i) positive electrodes called anode. ii) negative electrodes called cathode. When electricity is pass into the copper containing solution electrolysis process is starts and impure copper is formed in anode and pure copper is formed in cathode.

So, We can get pure copper in cathode through electrolysis.

I Hope this will be helpful for you.

If this is helpful for you .Then choose this answer as brainliest answer.

6 0

3 years ago

Just as one dozen eggs always has 12 eggs in it, one mole of a

zzz [600]

Answer:

$6.022x10^{23}atoms \ Al$

Explanation:

Hello,

In this case, given the described concept regarding the Avogadro's number, we can easily notice that 27.0 g of aluminium foil has 6.022x10²³ atoms as shown below based on the mass-mole-particles relationship:

$27.0gAl*\frac{1molAl}{27.0gAl} *\frac{6.022x10^{23}atoms \ Al}{1molAl} \\\\=6.022x10^{23}atoms \ Al$

Notice this is backed up by the fact that aluminium molar mass if 27.0 g/mol.

Best regards.

8 0

3 years ago

Chromium-51 is a radioactive isotope used to label red blood cells to identify if they remain intact in the body. It has a half-

agasfer [191]

$\left[\begin{array}{cccc}0 \ days&27,7days&55,4days&\textbf{83,1days}\\&&&\\0,25mg&0,125mg&0,0625mg&\textbf{0,03125mg}\end{array}\right]$

5 0

3 years ago

Read 2 more answers

Charlie is frying an egg in a pan located over a gas burner. He develops a model to determine the energy produced by the flame i

frosja888 [35]

Answer: B.)

Explanation: Heat flows from pan to sounroundings

8 0

3 years ago

Calculate sound speed in hydrogen H2 at temperture 50 C degree. Answer give in meter per second.

irina [24]

Answer:

The speed of sound in hydrogen gas is 361.5 $^{\circ} C$

Explanation:

It is given that the temperature is 50 $^{\circ} C$ .

The speed of sound in meter per second is calculated by an equation.

The equation states that speed of the sound in meter per second is equal to the sum of the product of the temperature in degree celsius with 0.60 and a constant that is 331.5.

The equation is written as:

$speed \ of \ sound \left(m/s \right) = 0.60 \times T + 331.5$

Put the value of T = 50 then the equation becomes,

$speed \ of \ sound \left(m/s \right) = 0.60 \times 50 + 331.5$

Speed of sound (in m/s) = 361.5 m/s

4 0

3 years ago