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S_A_V [24]
2 years ago
12

Pls help ASAP I’ll mark BRAINLIEST this is science btw.

Chemistry
1 answer:
Dmitrij [34]2 years ago
3 0

Answer:

It should be Magnetic fields can push and pull objects without touching

but I only say with touching. Maybe it's an error on you're teachers/Prof behalf.

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Which compound contains a triple bond?
Igoryamba
There are many compounds which contain triple bonds between two atoms. Few of the are as follow,

Nitrogen Molecule:

                           N₂   or   :N≡N:

Cyanide Ion:

                          CN⁻   or    [:C≡N:]⁻

Alkynes:
                          R-C≡C-R

Carbon Monoxide:

                          CO    or    :C≡O:

Among given compounds Alkynes belong to a class of unsaturated hydrocarbons. The carbon atom in alkyne is sp hybridized. These unsaturated hydrocarbons have their own characteristic chemical properties. 
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3 years ago
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A very old tree limb contains an amount of carbon-14 that is approximately 1/8 of the current atmospheric 14C levels.. Calculate
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A.       The radioactive decay equation is N = N0e^{-ln(2)*t/T }

where T is the half-life (5730 years), N0 is the number of atoms at time t = 0 and N is the number at time t.

Rewriting this as:

(N/N0) = e^{-ln(2)*t/T }

Since N = (1/8) N0 and substituting known values:

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Taking ln of both sides:

ln(1/8)= -ln(2)*t/5730

t = - 5730 * ln(1/8) / ln (2)

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The tree was cut down 17,190 years ago.

B.   N0 = 1,500,000 carbon-14 atoms

Since N = (1/8) N0

N = 187,500 carbon atoms left

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Melting is a process where a solid such as ice turns into liquid or water. The molecules of ice slowly moves and becomes unstable as they gain energy. As this energy builds up, kinetic energy increases and the intermolecular forces react because of this energy.Thank you for your question. Please don't hesitate to ask in Brainly your queries.
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