CHEMISTRY MIDDLE SCHOOL

A Nuclear reactor produces product 20kg of uranium-235.if the half life is about 70years , how long will it take to decay to 0.1kg​

Answers

Answer 1
Answer:

Answer:

t=(70)ln(19.9/20)/-ln2

70 is the years. 19.9 kg is what is left after 0.1kg decay. 20kg is your initial amount.

t=0.506 years with a decay constant of 0.0099021/year

Explanation:


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HIGH SCHOOL

Write the equation for the oxidation reaction that occurred on the copper spiral when it was heated

Answers

Cu + O2 -----> 2CuO

COLLEGE

Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "NOx") that are of interest to atmospheric chemistry. It can react with itself to form another form of NOx, dinitrogen tetroxide. A chemical engineer studying this reaction fills a 125.L tank with 35.mol of nitrogen dioxide gas. When the mixture has come to equilibrium she determines that it contains 8.0mol of nitrogen dioxide gas. The engineer then adds another 12.mol of nitrogen dioxide, and allows the mixture to come to equilibrium again. Calculate the moles of dinitrogen tetroxide after equilibrium is reached the second time.

Answers

The moles of dinitrogen tetroxide after equilibrium reached the second time is 18.78 moles.

What is dinitrogen tetroxide?

is a chemical compound used in the synthesis of chemicals.

The reaction is:

Now, the initial moles are

35. mol  of nitrogen dioxide gas

At equilibrium, = 8.0mol of nitrogen dioxide gas.

2 moles nitrogen oxide gives 1 mol  of dinitrogen tetra oxide.

Then 27 mol of nitrogen dioxide will give:

Mass of dinitrogen tetroxide = 13.5 mol

Concentration of nitrogen dioxide at equilibrium =

Concentration of dinitrogen tetra dioxide at equilibrium =

Equilibrium constant of reaction

Add 12.0 mol to the equilibrium value 8.0 mol

   (8.0 mo l+ 12 mol)

Initially               35.0 mol

At equilibrium    8.0 mol                        13.5 mol

Attaining equilibrium second time

Concentration of nitrogen dioxide at second equilibrium =

Concentration of dinitrogen tetra dioxide at second equilibrium =

Now the value of Kc is

we get x = 10.56

Moles of dinitrogen tetroxide after equilibrium is reached the second time

Thus, the value of dinitrogen tetroxide after equilibrium reached the second time is 18.78 mol.

Learn more about dinitrogen tetroxide here:

brainly.com/question/24675919

Answer:

The moles of dinitrogen tetroxide after equilibrium is reached the second time is 18.78 moles.

Explanation:

Initially 35.0 mol

Eq'm     8.0 mol                        13.5 mol

Moles of nitrogen dioxide = 35.0 mol

Moles of nitrogen dioxide at equilibrium = 8.0 mol

According to reaction, 2 moles nitrogen oxide gives 1 mol of dinitrogen tetraoxide. Then 27 mol of nitrogen dioxde will give:

Moles of dinitrogen tetroxide = 13.5 mol

Concentration of nitrogen dioxide at equilibrium,

Concentration of dinitrogen tetradioxide at equilibrium,

Equilibrium constant of reaction:

Now, adds another 12.0 moles of nitrogen dioxide.

Initially 35.0 mol

Eq'm     8.0 mol                        13.5 mol

After adding 12 moles of nitrogen dioxide the moles

    (8.0 mol+12 mol)

Again after attaining equilibrium second time:

     (20.0 -x)mol                       (13.5+x/2) mol

Concentration of nitrogen dioxide at second equilibrium,

Concentration of dinitrogen tetradioxide at second equilibrium,

on solving for x:

we get x = 10.56

Moles of dinitrogen tetroxide after equilibrium is reached the second time:

MIDDLE SCHOOL

Which substance is the base in the reaction?

Answers

Aqueous Arrhenius acids have characteristic properties which provide a practical description of an acid. Acids form aqueous solutions with a sour taste, can turn blue litmus red, and react with bases and certain metals to form salts.

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Brainliest?

HIGH SCHOOL

What is the net ionic equation for the reaction that occurs when aqueous solutions of koh and zncl2 are mixed?

Answers

Answer:

Net ionic equation:

Zn²⁺(aq)  +   2OH⁻(aq)     →    Zn(OH)₂(s)

Explanation:

Chemical equation:

ZnCl₂ + KOH    →   KCl  + Zn(OH)₂

Balanced chemical equation:

ZnCl₂ + 2KOH    →   2KCl  +Zn(OH)₂

Ionic equation;

Zn²⁺(aq)  + 2Cl⁻(aq)  + 2K⁺(aq)  +  2OH⁻(aq)     →   2K⁺(aq)  + 2Cl⁻(aq)   +Zn(OH)₂(s)

Net ionic equation:

Zn²⁺(aq)  +   2OH⁻(aq)     →    Zn(OH)₂(s)

The K⁺  and Cl⁻  are spectator ions that's why these are not written in net ionic equation. The  Zn(OH)₂ can not be splitted into ions because it is present in solid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

COLLEGE

In a first order decomposition, how long does it take (in seconds) for 75% of the compound to decompose given that k is 0.0909 sec-1 (give answer to 1 decimal place)?

Answers

Answer:

15.3 s

Explanation:

Let's consider the first-order decomposition of a generic compound A. We can find the concentration at a certain time using the following expression.

where,

: concentration of A at a time t

: initial concentration of A

k: rate constant

When 75% of A decomposes, the remaining concentration is 25% ( = 0.25 ). The required time is:

t = 15.3 s

MIDDLE SCHOOL

What is the nickname for hunds rule

Answers

Answer:

Electronic configuration is the short representation which we use to represent the structure of an atom.

Orbital diagram too is used for this purpose.

A circle or a square is used to represent an orbital.

Each orbital occupies 2 electron.

Subshells s contains 1 orbital with 2 electrons

p subshell contains 3 orbital with 6 electrons

d with 5 orbitals and 10 electrons  

f with 7 orbitals and 14 electrons.

Hund’s Rule says each orbital is filled singly first before we fill it up with the second electron in it.

Thus Hund’s Rule is also called as “Empty bus seat Rule” as the bus passenger sits and occupies alone in a double seat.

Then another one arrives there.

MIDDLE SCHOOL

What is purpose of lotion testing?

Answers

To make sure it is safe before we use it
MIDDLE SCHOOL

What does diatonic means​

Answers

Answer: Diatomic molecules are molecules made of two atoms chemically bonded together.

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Explanation:

HIGH SCHOOL

Which of the following best describes a Lewis base? A.It donates protons in solution.

B.It accepts protons in solution.

C.It donates electrons in solution.

D.It accepts electrons in solution.

Answers

Answer: Option (C) is the correct answer.

Explanation:

According to Lewis, a base is a substance or specie which is able to donate electrons.

For example, is a lewis base because nitrogen has a lone pair of electron.

Therefore, when ammonia is dissolved in HCl it will accept the hydrogen atom as nitrogen gave electron to the hydrogen atom. As a result, hydrogen bonds with nitrogen atom.

               

Thus, we can conclude that it donates electrons in solution best describes a Lewis base.

Not 100% sure but I believe it is C.
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