3 years ago

Chemistry !!!!! HELP !!!!!!!!

Chemistry

2 answers:

Len [333]3 years ago

7 0

Inbox me i will explain its easy..

lyudmila [28]3 years ago

3 0

Ill try to help you find the answer

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They neutralize each other

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What is the overall cell potential for this redox reaction? Ca2+ + 2Li = Ca + 2Li+ Ca2+ + 2e- = Ca -2.87 V Li = Li+ + e- -3.05 V

Jet001 [13]

The redox reaction is

$Ca^{+2} + 2Li(s) = Ca(s) + 2Li^{+}$

Here

Calcium undergoes reduction, and acts as cathode

Lithium undergoes oxidation and acts as anode

The reduction potential of calcium is -2.87 V

The reduction potential of lithium is - -3.05 V

We know that

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3 years ago

Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. Determine how much uranium-238 decays in milligrams (to three s

Mamont248 [21]

Answer:

2.15 mg of uranium-238 decays

Explanation:

For decay of radioactive nuclide-

$N=N_{0}.(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$

where N is amount of radioactive nuclide after t time, $N_{0}$ is initial amount of radioactive nuclide and $t_{\frac{1}{2}}$ is half life of radioactive nuclide

Here $N_{0}=4.60 mg$ , $t=4.1\times 10^{9}yr$ and $t_{\frac{1}{2}}=4.5\times 10^{9}yr$

So, $N=(4.60mg)\times (\frac{1}{2})^{\frac{4.1\times 10^{9}}{4.5\times 10^{9}}}$

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3 years ago

A scientist exam in two atoms. One has a nucleus with five protons in five neutron surrounded by five electrons. The other has a

grigory [225]

Answer:

C) They are not made of matter.

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Case in which protons are inside of neutrons doesn't exist.

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