Answer:
it will take 444.44 min to reach 0.25 M from 0.75 M
Explanation:
since the reaction constant is k= 6.00*10⁻³ L*mol⁻¹min⁻¹. For a reaction rate of the form
-dCa/dt=k*Caⁿ
doing a dimensional analysis
[dCa/dt]= mol/(L*min) = [k]*[Caⁿ] = L/(mol*min) * (mol/L)ⁿ
then only n=2 can comply with the dimensional analysis, therefore we get a the second order reaction . Thus
-dCa/dt=k*Ca²
-dCa/Ca² =k*dt
-∫dCa/Ca² =k*∫dt
(1/Ca₂ - 1/Ca₁)= k*Δt
Δt= 1/k*(1/Ca₂ - 1/Ca₁)
replacing values
Δt= 1/k*(1/Ca₂ - 1/Ca₁) = 1/(6.00*10⁻³ L*mol⁻¹min⁻¹)*(1/0.25 M - 1/0.75 M)= 444.44 min
The question requires to balance the equation.
The equation is already balanced, so the answer is:
<span>Ca(s)+Br2(l)⟶CaBr2(s)
</span><span>
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</span><span>Explanation:
</span><span>
</span><span>
</span><span>1) The phases are identified with a letter to the right of the compound or element:
</span><span>
</span><span>
</span><span>So, for Ca, the phase is (s) which means solid.
</span><span>
</span><span>
</span><span>For Br₂ (l) the phase is (l) which means liquid.
</span><span>
</span><span>
</span><span>For CaBr₂(s) the phase is (s) which means solid.
</span><span>
</span><span>
</span><span>2) The core work of balancing is make the number of atoms of each element on the reactants equal to the same number of atoms on the products side.
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</span><span>
</span><span>That is the law of conservation of mass applied to chemcial reactions.
</span><span>
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</span><span>3) So, you have to add coefficientes on the right place to make the number of atoms on the left side equal to the number of the same kind of atom on the right side.
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</span><span>
</span><span>In this table you can verify that the equation given is balanced:
</span><span>
</span><span>
</span><span>atom left side right side
</span><span>
</span><span>Ca 1 1
</span><span>
</span><span>Br 2 2
</span><span>
</span><span>So, you do not need to modify any coefficients.
</span>
Answer:
a. tiny particles that make up all matter
Answer:
B
Explanation:
It is believed that early humans used the Bering Land Bridge to migrate from Asia to the Americas
Hope this helps! :)
The electrons that are in the outermost electron shell, also known as the valence shell, have more energy then those in the inner electron shells, I hope this helps<3
