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3 years ago

What model is the basis for chemistry?

Chemistry

2 answers:

Vladimir79 [104]3 years ago

5 0

B) Bohr's atomic model

VashaNatasha [74]3 years ago

5 0

Option B: Bohr's atomic theory.

According to Bohr’s atomic model, electrons orbit the nucleus and they exist in constant energy state called stationary states. As they do not radiate energy, they orbit at constant distance from the nucleus. Bohr examine the emission spectrum of hydrogen, according to his observations he explained that on adding energy, electrons can move in different orbits and after removing the energy they came back to their original state by emitting the equal amount of energy.

Thus, in an atom, electrons move around nucleus in fixed paths with fixed energy called orbits . When it is in its original state, the energy is very low, and the state is known as ground state (closer to the nucleus). After gaining energy, electron gets excited to higher energy states known as excited state.

Since, it explains about the chemistry of atom, it is the basic model for chemistry.

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The elementary gas-phase reaction2A → Bis carried out in a constant-volume batch reactor where 50% conversion is achieved in 1 h

Zina [86]

Answer:

$V=5000dm^3$

Explanation:

Hello,

In this case, for the STR reactor carrying out this chemical reaction, the material balance is:

$\frac{dC_A}{dt}=r_A\\\\\frac{dC_A}{dt}=-kC_A^2$

Thus, with the given information we compute the rate constant as follows:

$C_A_0 \frac{dX_A}{dt}=kC_A_0^2(1-X_A)^2\\\\\int\limits^{0.5}_0 {\frac{dX_A}{(1-X_A)^2} } \,=kC_A_0t\\\\\frac{0.5}{1-0.5}=k*0.2\frac{mol}{dm^3}*1h\\ \\k=\frac{1}{(0.2\frac{mol}{dm^3})*1h} \\\\k=5\frac{dm^3}{mol*h}$

Now, for the CSTR we have the following design equation in terms of conversion for finding the volume:

$V=\frac{F_A_0*X_A}{-r_A}\\\\V=\frac{F_A_0*X_A}{k*C_A_0^2(1-X_A)^2}$

Therefore, it turns out:

$V=\frac{500\frac{mol}{h} *0.5}{5\frac{dm^3}{mol*h} *(0.2\frac{mol}{dm^3} )^2(1-0.5)^2}\\\\V=5000dm^3$

Best regards.

7 0

3 years ago

How much<br>much hydrogen gas evolved<br>when 1.5 current is passed through water for 1.5 hours?

evablogger [386]

0.042 moles of Hydrogen evolved

<h3>Further explanation</h3>

Given

I = 1.5 A

t = 1.5 hr = 5400 s

Required

Number of Hydrogen evolved

Solution

Electrolysis of water ⇒ decomposition reaction of water into Oxygen and Hydrogen gas.

Cathode(reduction-negative pole) : 2H₂O(l)+2e⁻ ⇒ H₂(g)+2OH⁻(aq)

Anode(oxidation-positive pole) : 2H₂O(l)⇒O₂(g)+4H⁻(aq)+4e⁻

Total reaction : 2H₂O(l)⇒2H₂(g)+O₂(g)

So at the cathode H₂ gas is produced

Faraday : 1 mole of electrons (e⁻) contains a charge of 96,500 C

$\tt mol~e^-=\dfrac{Q}{96500}$

Q = i.t

Q = 1.5 x 5400

Q = 8100 C

mol e⁻ = 8100 : 96500 = 0.084

From equation at cathode , mol ratio e⁻ : H₂ = 2 : 1, so mol H₂ = 0.042

4 0

3 years ago

Determine if the following statement is true or false.

inysia [295]

The statement <span>“the hydronium ion concentration of a solution that has a pH of 4.12 is 7.59 * 10^-9M</span>” is FALSE because the correct answer would be <span>7.6 x 10^-5 M. </span>I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

6 0

4 years ago

WILL GIVE BRAINLIEST

charle [14.2K]

Answer:

The pressure of the balloon is 0.98 atm

Explanation:

Using the equation P1V1 = P2V2, you can solve for the value of V2, which is 0.98 atm.

(P1V1)/P2 = V2

Plug in the numbers:

(6.5*1.5)/10.00

=0.975 atm

=.98 atm

3 0

3 years ago

I used a stick of (vegan) butter as our example of thinking about how temperature changes the properties of something when it is

blsea [12.9K]

Oh ok it says it hablar to be 20 characters

5 0

3 years ago