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Ray Of Light [21]
3 years ago
9

How many orbitals are contained in the n=4 shell?

Chemistry
1 answer:
liberstina [14]3 years ago
4 0

Answer:

The principal quantum number, n, determines the energy level of the electron in an atom. There are n2 orbitals for each energy level. So for n = 3 there are nine orbitals, and for n = 4 there are 16 orbitals.

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The rate constant of a reaction is 4.7×10−3 s−1 at 25°C, and the activation energy is 33.6 kJ/mol. What is k at 75°C?
vodomira [7]

Answer:

k is 3,18*10⁻² s⁻¹ at 75°C

Explanation:

following Arrhenius equation:

k= k₀*e^(-Ea/RT)

where k= rate constant , k₀= frequency factor , Ea= activation energy , R= universal gas constant T=absolute temperature

then for T₁=25°C =298 K

k₁= k₀*e^(-Ea/RT₁)

and for T₁=75°C = 348 K

k₂= k₀*e^(-Ea/RT₂)

dividing both equations

k₂/k₁= e^(-Ea/RT₂+Ea/RT₁ )

k₂= k₁*e^[-Ea/R*(1/T₂-1/T₁ )]

replacing values

k₂= k₁*e^[-Ea/R*(1/T₂-1/T₁ )] = 4,7*10⁻³ s⁻¹ *e^[-33.6*1000 J/mol /8.314 J/molK*(1/ 348 K -1/298 K )] = 3,18*10⁻² s⁻¹

thus k is 3,18*10⁻² s⁻¹ at 75°C

6 0
4 years ago
How might a living and a nonliving element in a forest interact?
poizon [28]

Answer:

I believe the answer is: C a bear living in a hollowed-out log.

Because:

The bear is living and the hollowe-out-log isn't.

6 0
2 years ago
Read 2 more answers
Which planet has a thick atmosphere, which is mainly composed of carbon dioxide? A. Mars B. Mercury C. Earth D. Venus
Nady [450]
The answer is D.) Venus
7 0
3 years ago
Read 2 more answers
Calculate the pKa of lactic acid (CH3CH(OH)COOH) given the following information. 3.005 grams of potassium lactate are added to
snow_lady [41]

Answer:

\displaystyle \text{p} K_a \approx 3.856

Explanation:

Because 3.005 grams of potassium lactate is added to 100. mL of solution, its concentration is:


\displaystyle \begin{aligned} \left[ \text{KC$_3$H_$_5$O$_3$}\right]  & = \frac{3.005\text{ g KC$_3$H_$_5$O$_3$}}{100.\text{ mL}} \cdot \frac{1\text{ mol KC$_3$H_$_5$O$_3$}}{128.17 \text{ g KC$_3$H_$_5$O$_3$}} \cdot \frac{1000\text{ mL}}{1\text{ L}} \\ \\ &= 0.234\text{ M}\end{aligned}

By solubility rules, potassium is completely soluble, so the compound will dissociate completely into potassium and lactate ions. Therefore, [KC₃H₅O₃] = [C₃H₅O₃⁺]. Note that lactate is the conjugate base of lactic acid.

Recall the Henderson-Hasselbalch equation:

\displaystyle \begin{aligned}\text{pH} = \text{p}K_a + \log \frac{\left[\text{Base}\right]}{\left[\text{Acid}\right]} \end{aligned}

[Base] = 0.234 M and [Acid] = 0.500 M. We are given that the resulting pH is 3.526. Substitute and solve for p<em>Kₐ</em>:

\displaystyle \begin{aligned} (3.526) & = \text{p}K_a + \log \frac{(0.234)}{(0.500)} \\ \\ 3.526 & = \text{p}K_a + (-0.330) \\ \\ \text{p}K_a & = 3.856\end{aligned}

In conclusion, the p<em>Kₐ </em>value of lactic acid is about 3.856.

5 0
2 years ago
Gas or methane hydrates in the arctic tundra show increasing promise as a limited energy supply for which two of these countries
vredina [299]

Answer:

The correct answer is option D. "Russia and Canada".

Explanation:

Russia and Canada are countries with extensive areas of arctic tundra conditions. These two countries could use these areas as a source of gas or methane hydrates since it have been demonstrated that tundra is rich in these gasses, which are trapped inside the ice. Unfortunately methane is a powerful greenhouse gas, and its release to the atmosphere is an environmental concern that rises from the climate change phenomena.

7 0
3 years ago
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