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dimaraw [331]
3 years ago
5

Which of the following are weak electrolytes in water

Chemistry
2 answers:
Bumek [7]3 years ago
7 0
<span>ionic compounds that partially dissociate in water </span>
anzhelika [568]3 years ago
4 0
Not strong base and acid, not dissolved or not aqueous.
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What is the percentage composition of cucl
mart [117]
The formula weight of CuCl is: 98.999 

<span>Percent compositions are usually weight percent (abbreviated w/o). </span>

<span>Since CuCl has one mole of each element, the calculation is simple. </span>

<span>For Cu it is: (63.546 / 98.999) x 100% = 64.189 w/o </span>

<span>For Cl it is 100.000 - 64.189 = 35.811 w/o </span>
6 0
3 years ago
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Photovoltaic cells convert solar energy into electricity. Calculate the wavelength of light (in nm) required for mercury (Φ =7.2
Sholpan [36]

Answer:

275.3 nm is the wavelength of light required for mercury.

Mercury can not be used to generate electricity from the sun because wavelength at which mercury will emit an electron is smaller than 500 nm.

Explanation:

The wavelength of light required for mercury  to emit an electron.

The wavelength of the radiation = \lambda

Energy required fro mercury to to emit an electron = E

Energy required fro mercury to to emit an electron will the energy if the radiation = E' = 7.22\times 10^{-19} J

E' = E

To calculate the wavelength of light, we use the equation:

E=\frac{hc}{\lambda }

where,

\lambda = wavelength of the light  

h = Planck's constant = 6.626\times 10^{-34} Js

c = speed of light = 3\times 10^8m/s

\lambda =\frac{hc}{E}

=\frac{6.626\times 10^{-34} Js\times 3\times 10^8m/s}{7.22\times 10^{-19} J}

\lambda =2.753\times 10^{-7} m=2.753\times 10^{-7}\times 10^ nm =275.3 nm

Wavelength of the sun light in the visible region = 500 nm

500 nm > 275.3 nm

E\propto \frac{1}{\lambda }

Less energy < more energy

So, this means that mercury can not be used to generate electricity from the sun.

6 0
3 years ago
What is the mass, in amu, of an atom with one proton and two neutrons?
Neko [114]

mass of proton mp=1.672621898e-27 kg and 1 amu=1.66053904e-27kg so it’s just divition (1.672621898e-27 / 1.66053904e-27) =1.007276 amu

4 0
3 years ago
Why is it important for science to keep testing a hypothesis even after they’ve found it to be true?
satela [25.4K]

Answer:

Explanation:

Repeated tests help determine whether the hypothesis is always true in different circumstances. Repeatedly testing a hypothesis qualifies it to be accepted as a theory.

6 0
2 years ago
Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strip
frosja888 [35]
<span>B) Magnesium reacts in acids</span>
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2 years ago
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