Answers
The specie which is acting as a catalyst is; Ag+(aq).
Discussion:
The catalyst is a specie that exists in the same form at the beginning and end of the reaction.
The reaction's mechanism is as follows;
- Step 1: Ag+(aq) + Ce⁴+(aq) <-----> Ag²+(aq) + Ce³+(aq)
- Step 2: Tl+(aq) + Ag²+(aq) -----> Tl²+(aq) + Ag+(aq)
- Step 3: Tl²+(aq) + Ce⁴+(aq) -----> Tl³+(aq) + Ce³+(aq)
Evidently, although Ag+(aq) was converted to Ag²+(aq) in Step 1 of the reaction; the Ag²+(aq) is reverted back to Ag+(aq) in Step 2 of the reaction.
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Answer:
Ag⁺ acts as the catalyst.
Explanation:
Hello,
In this case, each step is reorganized:
- Step 1:
- Step 2:
- Step 3:
In such a way, Ag⁺ is converted to Ag²⁺ in the first step, but then it is regenerated to simple Ag⁺, therefore, Ag⁺ acts as the catalyst.
Best regards.
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Answers
Energy = mC(T2-T1)
Energy = 255(4.184)(12.5)
Energy = 13336.5 J
Answer: The amount of energy required to raise the temperature is 13323.75 joules.
Explanation :
The amount of energy required to raise the temperature can be calculated as follows.
where,
q = heat energy
m = mass of water
C = specific heat
T = temperature
Remember that the specific heat of water is .
Therefore, putting the values in the above equation as follows.
= 13323.75 joules
So, the amount of energy required to raise the temperature is 13323.75 joules.
Answers
Hope this helps!
Answers
so considering the above given condition for
whereas HCl and NaOH are strong acid and strong base which does not satisfies the criteria for being called as buffer.
As buffer needs a weak acid and its conjugate base to behave and act as buffer and resist any pH change.
Ba(OH)2 (aq) + H2SO4(aq) → BaSO4(s) + H2O(l)
BaSO4(s) + 2 H2O(l) → Ba(OH)2 (aq) + H2SO4(aq)
Ba(OH)2 (aq) + H2SO4(aq) → BaSO4(s) + 2 H2O(l)
Answers
Answer:
Ba(OH)2 (aq) + H2SO4(aq) → BaSO4(s) + 2 H2O(l)
That's the right one.
Explanation:
You should see that this equation is balanced, not as
Ba(OH)2 (aq) + H2SO4(aq) → BaSO4(s) + H2O(l)
(on reactive we have 4 H, on products, we have only 2)
Ba(OH)2 (aq) + H2SO4(aq) → H2Ba(s) + SO4(OH)2(l)
(this is impossible, it's a nonsense)
BaSO4(s) + 2 H2O(l) → Ba(OH)2 (aq) + H2SO4(aq)
(it is the same with the right one but is the other way around. The statement says, reaction of Ba(OH)2 with H2SO4, not BaSO4 with water. Also, it is not a chemical balance.
Answers
Answer:
(0,653±0,002) M of HNO₃
Explanation:
The reaction of standarization of HNO₃ with Na₂CO₃ is:
2 HNO₃ + Na₂CO₃ ⇒ 2 Na⁺ + H₂O + CO₂ + 2NO₃⁻
To obtain molarity of HNO₃ we need to know both moles and volume of this acid. The volume is (27,71±0,05) mL and to calculate the moles it is necessary to obtain the Na₂CO₃ moles and then convert these to HNO₃ moles, thus:
0,9585 g of Na₂CO₃ × ( 1 mole / 105,988 g) =
9,043×10⁻³ mol Na₂CO₃ × ( 2 moles of HNO₃ / 1 mole of Na₂CO₃) = 1,809×10⁻² moles of HNO₃
Molarity is moles divide liters, thus, molarity of HNO₃ is:
1,809×10⁻² moles / 0,02771 L = 0,6527 M of HNO₃
The absolute uncertainty of multiplication is the sum of relative uncertainty, thus:
ΔM = 0,6527M× (0,0007/0,9585 + 0,001/105,988 + 0,05/27,71) =
0,6527 M× 2,54×10⁻³ = 1,7×10⁻³ M
Thus, molarity of HNO₃ solution and its absolute uncertainty is:
(0,653±0,002) M of HNO₃
I hope it helps!
Answers
Final answer:
The range of radii of most atoms is typically in the nanometer scale (nm) and can be measured using the covalent radius. The size of an atom's nucleus is much smaller than the atom itself. The Bohr model provides a formula to calculate the radius of hydrogen-like atoms.
Explanation:
The range of radii of most atoms is typically in the nanometer scale (nm). The covalent radius, which is defined as half the distance between the nuclei of two identical atoms when they are joined by a covalent bond, provides a practical way to measure the size of atoms. As we move down a group in the periodic table, the covalent radius generally increases, indicating a larger size of the atom. For example, the covalent radius of the halogens increases as we move from fluorine to iodine.
The size of an atom's nucleus, on the other hand, is much smaller than the atom itself. The nucleus has a diameter of about 10-15 meters, while the typical atom has a diameter of the order of 10-10 meters. This difference in size illustrates the emptiness of atoms, with the distance from the nucleus to the electrons being typically 100,000 times the size of the nucleus.
The Bohr model provides a formula to calculate the radius of hydrogen-like atoms, which depends on the principal quantum number (n) and the atomic number (Z). The calculated radii of the orbits of the hydrogen atom have been experimentally verified to have a diameter of a hydrogen atom.
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Final answer:
The range of radii of most atoms is typically measured in nanometers (nm). Covalent radius and hydrogen-like orbits are two methods used to estimate the size of atoms. The size of an atom can vary depending on the element and measurement technique, but most atoms have radii on the order of nanometers (nm).
Explanation:
The range of radii of most atoms is typically measured in nanometers (nm). The size of an atom can be estimated using various techniques. One commonly used measure is the covalent radius, which is defined as one-half the distance between the nuclei of two identical atoms when they are joined by a covalent bond. The covalent radii of different elements can be found in tables and can vary depending on the element and its position in the periodic table.
Another way to estimate the size of atoms is by looking at the sizes of their orbits in hydrogen-like atoms. These orbits are given in terms of their radii by a mathematical expression that includes a constant called the Bohr radius, which is approximately 5.292 × 10-11 m.
Overall, the size of an atom can vary depending on the element and the specific measurement technique used, but most atoms have radii on the order of nanometers (nm).
Learn more about Sizes of Atoms here:
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