Answer : The correct option is, (3) an Arrhenius acid
Explanation :
According to the Arrhenius concept, an acid is a substance which ionizes in the water to give hydronium ion or hydrogen ion and a base is a substance which ionizes in the water to give hydroxide ion .
When one compound dissolves in water, then only positive ion produced in the solution is . This compound is classified as an Arrhenius acid.
Hence, the correct option is, (3) an Arrhenius acid
b. entirely converted to helium.
c. partially converted to energy.
d. partially converted to deuterons.
it is c partially converted to energy
(2) Cr, Cl2, C (4) Se, Sn, Sr
Periodic table contain element of various states like solid, liquid and gases. Thus the that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option.
Periodic table is a table in which we find elements with properties like metals, non metals, and metalloids
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar. It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar are gases in nature.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option
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Answer: Option (1) is the correct answer.
Explanation:
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar or 0.98 atm.
It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar etc are gases in nature.
Hence, given elements are differentiated as follows.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He.
The pH of a 0.027 M KOH solution is 12.4 and since KOH is a strong base it will dissociate completely in the solution
KOH is a strong base, so it will dissociate completely in solution to form potassium ions and hydroxide ions. The concentration of hydroxide ions will be equal to the concentration of KOH, which is 0.027 M.
The pH of a solution can be calculated using the following equation:
pH = -log[H+]
where [H+] is the concentration of hydrogen ions in the solution.
The concentration of hydrogen ions in a basic solution is very low, so we can use the approximation that:
pH = 14 - log[OH-]
pH = 14 - log(0.027)
pH = 12.4
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How many moles of H2 are produced?
How many liters of H2 are produced?
0.5 moles is required for the given reaction to occur. Mole is a constant that represents a certain amount of particles such as atoms, ions, or molecules.
It is the number or constant that represents a certain amount of particles such as atoms, ions, or molecules.
1 mole = particles.
Where,
- number of moles
- given mass = 13.5 g.
- molar mass = 26.98 g/mol.
Put the values in the formula,
Therefore, 0.5 moles is required for the given reaction to occur.
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Answer:
1) 0.5 mol.
2) 0.75 mol.
3) 16.8 L.
Explanation:
1) How many moles of Al react?
n = mass / molar mass,
Mass of Al = 13.5 g.
Molar mass mass of Al = 26.98 g/mol.
∴ The number of moles of Al (n) = mass / molar mass = (13.5 g) / (26.98 g/mol) = 0.5 mol.
2) How many moles of H₂ are produced?
2Al + 6HCl → 2AlCl₃ + 3H₂.
Using the cross multiplication:
2.0 moles of Al → 3.0 moles of H₂, from the stichiometry,
0.5 mole of Al → ??? moles of H₂.
∴ The number of moles of H₂ are produced = (0.5 mole)(3.0 mole) / (2.0 mole) = 0.75 mol.
3) How many liters of H₂ are produced?
It is known that at STP, 1.0 mole of any gas occupies a volume of 22.4 L.
Using cross multiplication:
1.0 mole occupies → 22.4 L.
0.75 mole occupies → ??? L.
∴The number of liters of H₂ are produced = (0.75 mole)(22.4 L) / (1.0 mole) = 16.8 L.