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Shkiper50 [21]
3 years ago
14

Is potassium magnetic?

Chemistry
2 answers:
tekilochka [14]3 years ago
7 0

Answer:

<h3><em>Make sure you re-write this on your own so your teacher doesn't think your cheating!</em></h3>

Explanation:

Potassium : Paramagnetic : Praseodymium

Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force.

Nadya [2.5K]3 years ago
4 0
Potassium is paramagnetic meaning it is weakly attractive in a magnetic field.
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3 years ago
Hydrogen-3 has a half-life of 12.32 years. A sample of H-3 weighing 3.02 grams is left for 15.0 years. What will the final weigh
kaheart [24]

Answer:

\large \boxed{\text{1.38 g}}

Explanation:

Two important formulas in radioactive decay are

(1) \qquad t_{\frac{1}{2}} = \dfrac{\ln 2}{k}\\\\(2) \qquad \ln \left(\dfrac{N_{0}}{N}\right) = kt

1. Calculate the decay constant k

\begin{array}{rcl}t_{\frac{1}{2}} &=& \dfrac{\ln 2}{k}\\\\\text{12.32 yr} &= &\dfrac{\ln 2}{k}\\\\k & = & \dfrac{\ln 2}{\text{12.32 yr}}\\\\& = & \text{0.056 26 yr}^{-1}\\\end{array}

2. Calculate the mass remaining

\begin{array}{rcl}\ln \left(\dfrac{A_{0}}{A}\right) &= &kt \\\\\ln \left(\dfrac{\text{3.20 g}}{A}\right) &= &\text{0.056 26 yr}^{-1}\times \text{15 yr} \\\\\ln \left(\dfrac{\text{3.20 g}}{A}\right) &= &0.8439 \\\\\dfrac{\text{3.20 g}}{A} &= &e^{0.8439} \\\\\dfrac{\text{3.20 g}}{A}&= &2.325 \\\\A &= &\dfrac{\text{3.20 g}}{2.325}\\\\&= & \textbf{1.38 g}\\\end{array}\\\text{The final mass of the sample will be $\large \boxed{\textbf{1.38 g}}$}

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