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Dimas [21]
3 years ago
5

What is the atomic number of an atom that has fie neutrons and four electrons

Chemistry
2 answers:
stepladder [879]3 years ago
6 0
4 atomic number of an atom
Natali [406]3 years ago
3 0

Answer:

4

Explanation:

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A certain first-order reaction (A→products) has a rate constant of 8.10×10−3 s−1 at 45 ∘C. How many minutes does it take for the
stira [4]

Answer:

The answer is 5.7 minutes

Explanation:

A first-order reaction follow the law of Ln [A] = -k.t + Ln [A]_{0}. Where <em>[A]</em> is the concentration of the reactant at any <em>t</em> time of the reaction, [A]_{0} is the concentration of the reactant at the beginning of the reaction and <em>k</em> is the rate constant.

Dropping the concentration of the reactant to 6.25% means the concentration of A at the end of the reaction has to be [A]=\frac{6.25}{100}.[A]_{0}. And the rate constant (<em>k</em>) is 8.10×10−3 s−1

Replacing the equation of the law:

Ln \frac{6.25}{100}.[A]_{0} = -8.10x10^{-3}s^{-1}.t + Ln[A]_{0}

Clearing the equation:

Ln [A]_{0}.\frac{6.25}{100} - Ln [A]_{0} = -8.10x10^{-3}s^{-1}.t

<em>Considering the property of logarithms: </em>Ln A - Ln B = Ln \frac{A}{B}

Using the property:

Ln \frac{[A]_{0}}{[A]_{0}}.\frac{6.25}{100} = -8.10x10^{-3}s^{-1}.t

Clearing <em>t </em>and solving:

t = \frac{Ln \frac{6.25}{100} }{-8.10x10^{-3}s^{-1} } = 342.3s

The answer is in the unit of seconds, but every minute contains 60 seconds, converting the units:

342.3x\frac{1min}{60s} = 5.7min

6 0
3 years ago
Plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz help :) ..
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Answer:

Explanation:the best guess I will go with is H but I might be wrong

4 0
2 years ago
What does a TRAAP test stand for
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TIMELINESS, RELEVANCE, AUTHORITY, ACCURACY and PURPOSE.

Explanation:

hope it helps!

7 0
2 years ago
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In a balanced equation, the same number of each kind of atom is shown on each side of the equation. calculate the number of iron
Juliette [100K]
There is a missing portion of this question which shows the reaction that needs balancing:

"In a balanced equation, the same number of each kind of atom is shown on each side of the equation. Calculate the number of iron (Fe), oxygen (O), and carbon atoms (C).

Fe2O3+ 3CO --> 2Fe + 3CO<span>2

</span><span>Based on these values, is the equation balanced?</span><span>"
</span>
To check if this equation is balanced we simply compare the number of each element on each side of the equation.

On the reactant side of the equation we have:

2 Fe atoms
6 O atoms
3 C atoms

On the product side of the equation we have:

2 Fe atoms
6 O atoms
3 C atoms

Therefore, both side of the reaction have the correct and equal number of each atom, so the equation is balanced.
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3 years ago
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Is kingdom more specific taxon than family?
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Yes the kingdom is more specific
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