What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher?
Answers
[OH-] = 10^-pOH
= 10^-9
= 1.00x 10^-9
hope it helps
The negative log of hydrogen or hydronium ions concentration gives the pH of the solution. The concentration of hydronium is more than the hydroxide ions.
What are pH and pOH?
The pH of the solution is the concentration of the hydrogen or the hydronium ion in the aqueous solution, whereas the concentration of the hydroxide ion in the solution gives the pOH.
Let the pH of the tea = 5 then,
The concentration of hydronium ion is calculated as:
The concentration of hydroxide ion is calculated as:
Calculating further:
Therefore, the concentration of the hydronium ion is much higher than that of the hydroxide ion.
Learn more about pH and pOH here:
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Answer : The phenomenon called as Nuclear Fusion is observed in the sun's core or solar core, where 4 atoms of Hydrogen molecule combines to give two atoms of Helium. It is due to fusing of two Hydrogen atoms to form one Helium molecule. In the core of sun this fusion process occurs, changing of mass of Hydrogen atom into Helium releases lot of energy in the form of heat and light.
The reaction that occurs inside the solar core is given below;
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b) mass percent sucralose:%?
Answers
The mass percentage of vitamin C is 74.5% and the mass percentage of sucralose is 25.5%.
Osmotic pressure (π) = iCRT
Where;
π = Osmotic pressure = 3.18 atm
i = Van't Hoff factor = 1 (molecular solution)
C = concentration (in mol/L)
R = gas constant = 0.082 LatmK-1mol-1
T = temperature = 287 K
But C = number of moles(n) /Volume (V)
volume = 41.1 mL or 0.0411 L
Substituting into the given equation;
π = n/V × RT
Make n the subject of the formula;
n = πV/RT
n = 3.18 atm × 0.0411 L/0.082 LatmK-1mol-1 × 287 K
n = 0.0056 moles
Mass of vitamin C = a
Mass of sucralose = b
Mass of sample = 1.149 g
Hence;
a + b = 1.149
b = 1.149 - a
Molar mass of vitamin C = 176 g/mol
Molar mass of sucralose = 398 g/mol
Total number of moles = number of moles of vitamin C + number of moles of sucralose
0.0056 moles = a/176 + (1.149 - a)/398
70048 ( 0.0056 ) = 398a + 176 (1.149 - a)
392.269 = 398a + 202.224 - 176a
392.269 - 202.224 = 398a - 176a
190.045 = 222a
a = 190.045/222
a = 0.856 g
But;
b = 1.149 - a
Where a = 0.856 g
b = 1.149 - 0.856
b = 0.293 g
Mass percent vitamin C = 0.856 g/1.149 g × 100/1
= 74.5%
Mass percent sucralose = 0.293/1.149 g × 100/1
= 25.5%
Learn more: brainly.com/question/14191541
Answers
Answers
Final answer:
Blue light is emitted when an electron in a He+ ion falls from the energy level n=4 to n=1. This is because the energy difference between these levels is similar to that in a hydrogen atom when blue light is emitted (from n=5 to n=2).
Explanation:
The energy of the emitted photon when an electron transitions between energy levels in an atom is determined by the difference between the energy levels it transitions between. This is described by the formula: E = hν, where E stands for energy, h stands for Planck's constant, and ν stands for frequency. The color of the emitted light, or the wavelength, is determined by the energy of the photon.
For blue light to be emitted when an excited electron falls from n=4 in a He+ ion, it must fall into n=1. This is because the energy gap between the n=4 and n=1 levels in a He+ ion is similar to that between the n=5 and n=2 levels in a hydrogen atom, which results in the emission of blue light.
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Final answer:
In a helium ion (He+), an electron would need to fall from n=4 to n=1 to emit a photon of blue light, similar to the photon emitted when an electron in a hydrogen atom falls from n=5 to n=2.
Explanation:
According to the Bohr model of atoms, when an electron falls from a higher to a lower energy level, a photon is emitted. The energy (and therefore color) of the photon corresponds to the energy difference between the two energy levels. In the case of your question, an excited electron in a hydrogen atom falls from n=5 to n=2 and emits a photon of blue light.
If an electron in an excited helium ion (He+) falls from the n=4 level, to emit a photon of similar energy (and thus color), it must fall to a level that yields a similar energy difference. Based on the energy levels of helium and hydrogen, the electron in the He+ ion would need to fall to n=1 to emit a photon of similar energy to the blue light from the hydrogen atom, given that the energy difference in He+ ion is larger than in hydrogen atom for the same quantum numbers due to its greater nuclear charge.
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B) carbon
C) flourine
D) neon
and can you give me a explanation with the answer you chose
Answers
Elements undergo chemical reactions because they are not stable and they want to become stable, that is they want to attain octet form. To attain octet form, an atom of element must have eight electrons in its outermost shell. Thus, elements undergo various types of chemical bonding in order to have 8 electrons in their outermost shells.
Neon has atomic number of 10 and its electronic configuration is 2,8. This means that, neon already has 8 electrons in its outermost shell and so does not need to form any chemical bond with any other element again, it is already stable. This is why, neon is the least likely to undergo chemical reaction and this is also the reason whey the element is chemically inert.
The other elements given in the option do not have 8 electrons in their outermost shell, so they will be quite willing to undergo chemical reactions in order to become stable.
It has three nonbonding electrons.
It has five valence electrons available for bonding.
It has five nonbonding electrons.
Answers
I hope this helps. Let me know in the comments if anything is unclear.
Answer:The answer is "It has five valence electrons available for bonding". An element's group number is equivalent to the number of valence electrons that it has. This means that since phosphorus is found on group number 5, it has 5 valence electrons that participate in bonding. It also means that it needs 3 more electrons to complete its valency.