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2 years ago

5

How many electrons are in the n = 2 shell of a magnesium atom?

1 answer:

Montano1993 [528]2 years ago

8 0

Answer:

eight

Explanation:

That means there are 12 electrons in a magnesium atom

hope this helps

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Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

yuradex [85]

Answer:

$\boxed{\text{2408 min}}$

Explanation:

The integrated rate law for radioactive decay is

$\ln\dfrac{N_{0}}{N_{t}} = kt$

1. Calculate the decay constant

$\begin{array}{rcl}\ln \dfrac{100}{90} & = & k \times 366\\\\1.054 & = & 366k\\\\k & = & \dfrac{1.054 }{366}\\\\k & = & 2.879 \times 10^{-4} \text{ min}^{-1}\\\end{array}\\\\$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k}\\\\t_{\frac{1}{2}} = \dfrac{\ln2}{2.879 \times 10^{-4} \text{ min}^{-1}} = \text{2408 min}\\\\\text{The half-life for decay is } \boxed{\textbf{2408 min}}$

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3 years ago

If the equation CO(g) + 2H2(g) →← → ← CH3OH(g) + energy is for a system at equilibrium, increasing the temperature will cause __

Eddi Din [679]

Answer:

[CH₃OH] to decrease and [CO] to increase.

Explanation:

Since the energy appears as a product. So, the system is exothermic that releases heat.

Increasing the temperature of the system will cause the system to be shifted to the left side to attain the equilibrium again.

So, the right answer is:

<em>[CH₃OH] to decrease and [CO] to increase.</em>

<em></em>

6 0

3 years ago

What STARTING element undergoes alpha decay to yield uranium-234 (U) as a PRODUCT?

nadezda [96]

Uranium-238 is the element that undergoes decay to yield uranium-234

3 0

2 years ago

Gold alloys are _____.

chubhunter [2.5K]

Gold alloys consist of most commonly Nickel!
Most commonly used in things like jewelry so it doesn't have such a heavy weight.

7 0

2 years ago

A car is traveling at a speed of 65 mi/h. How long does it take to cover a distance of 235 m?

fgiga [73]

Answer:

It will take 8.09 seconds to cover 235 meters by car with speed of 65 mile/h.

Explanation:

Speed of the car = 65 mile/h = 65 1609.34 m/h = 104,607.1 m/h

1 mile = 1609.34 m

Distance covered by the car in t time = 235 m = mile

$Speed-\frac{Distance}{Time}$

$104,607.1 m/h=\frac{\frac{235}{1609.34} mile}{t}$

$t=\frac{235 m}{104,607.1 m/h}$

t = 0.002246 h

1 hour = 3600 seconds

0.002246 h = 0.002246 h × 3600 seconds = 8.09 seconds

It will take 8.09 seconds to cover 235 meters by car with speed of 65 mile/h.

5 0

3 years ago