Substance A is mixed with water and donates 0.4% of its H⁺ ions, therefore given substance is a weak acid & show poor conduction of electric current.
According to the Arrhenius theory of acids and bases, acids are those species which gives H⁺ ion to the solution.
In the question it is given that, substance A is mixed with water and it donates H⁺ ion, from this it is clear that given substance is acid. It is also mention that it donates only 0.4% of its H⁺ ion means partial dissociation is observed, so we conclude that this acid is weak in nature. And due to weak dissociation and less number of available H⁺ ion it did not conduct electricity effectively.
Hence, option (D) is correct i.e. it is weak acid and a poor conductor of electric current.
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Answer:
D
Explanation:
Selenium tetrafluoride (SeF4) is a molecule characterized by a covalent bond, not an ionic bond. This bond is formed by the sharing of electron pairs between selenium and fluorine atoms.
The question we have here asks, Is selenium tetrafluoride an ionic or covalent bond?
Selenium tetrafluoride, otherwise known as SeF4, is a molecule formed by the chemical bonding of selenium and fluorine. This bonding is not ionic in nature, but covalent. When you hear the term covalent bond, it refers to a bond formed by the sharing of electron pairs between atoms. Here, selenium and four fluorine atoms share their electrons, therefore creating a molecule of selenium tetrafluoride via a covalent bond.
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Selenium tetrafluoride (SeF4) is a covalent bond because it involves the sharing of electrons between two nonmetals, selenium and fluorine. This contrasts ionic bonds, which typically involve a metal donating electrons to a nonmetal.
Selenium tetrafluoride, identified by the chemical formula SeF4, is a type of covalent bond. This classification is due to the fact that selenium and fluorine are both nonmetals. In chemistry, when two nonmetals form a compound, they usually share electrons, resulting in a covalent bond. The electrons are shared because each atom wants to achieve a stable setup, often attained with a full outer shell. Therefore, these compounds are described as covalent or molecular. An example of an ionic bond, on the other hand, involves a metal and a nonmetal. In this type of bond, the metal will lose electrons to become a positively charged cation, while the nonmetal will gain these same electrons to become a negatively charged anion.
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Answer:
D. A form of an atom with a different number of neutrons.
Explanation:
An Isotope has an equal number of protons but different numbers of neutrons in their nuclei.
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Answer:
B) Heat is given off.
Explanation:
When heat is given off, a chemical change must have occurred and such a reaction is termed an exothermic reaction.
A chemical change is one in which;
Most chemical reactions are accompanied by heat changes.
orbiting a planet?
the mass of the satellite
the orbital radius of the satellite
the mass of the planet
the universal gravitational constant
Pls help I will give extra points
The mass of the satellite is not required when calculating the velocity of a satellite orbiting a planet.
Given that the centripetal force on the satellite is;
F = mv^2/r
Where;
F = centripetal force that keeps the satellite in its orbit
m = mass of the satellite
r = radius of the satellite
Since the force of gravity and the centripetal force both act on the satellite and they are exactly balanced;
F = GMm/r^2
Where;
G = gravitational constant
M = mass of the planet
m = mass of the satellite
r = radius of the satellite
Hence;
F = GMm/r^2 = mv^2/r
GMm/r^2 = mv^2/r
v = √GM/r
Thus, the mass of the satellite is not required when calculating the velocity of a satellite orbiting a planet.
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Answer:
i. the mass of the satellite will not be required in this calculation
Explanation:
When a satellite is orbiting a planet, it experiences two forces. The centripetal force and the gravitational force that the planet exerts on the satellite. In order for the satellite to keep in orbit, the centripetal force and the gravitational force must be equal.
The expression for the centripetal force is:
F_c = (m_s)v² / R
where
m_s is the mass of the satellite
R is the radius of the satellite's orbit
v is the velocity that the satellite travels with around the planet
The expression for the Gravitational force is:
F_g = (G M_p m_s) / R²
where
G is the universal gravitational constant
M_p is the mass of the planet
m_s is the mass of the satellite
R is the radius of the satellite's orbit
Thus, equating the two forces together, we get:
(G M_p m_s) / R² = (m_s)v² / R
We can cancel out m_s since it is a common factor on both sides.
Thus,
(G M_p) / R² = v² / R ⇒ M_p = v²R / G
Therefore, the mass of the satellite is not required to calculate the mass of the planet.
Explanation:
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