Answer: Option (B) is the correct answer.
Explanation:
When the book was at the shelf, it had only potential energy as potential energy is the energy possessed due to the position of an object.
Therefore, when the book falls from the book shelf it gains kinetic energy as kinetic energy is the energy possessed due to the motion of an object.
Thus, when the books is falling from the top shelf then the motion of book increases therefore, we can conclude that the potential energy decreases as kinetic energy increases.
Answer:
Here's what I get
Explanation:
SiO₂ + 4HF ⟶ SiF₄ + 2H₂O
The molar ratios are the same as the coefficients in the balanced equation.
Some of the molar ratios are
SiO₂:HF = 1:4
SiO₂:SiF₄ = 1:1
SiO₂:H₂O = 1:2
HF:SiF₄ = 4:1
HF:H₂O = 4:2
SiF₄:H₂O = 1:2
Answer:
Following are the <span>conjugate acid-base pairs;
1) NH</span>₃ , NH₄⁺
2) CH₃CO₂⁻ , CH₃COOH
Explanation:
According to Brønsted–Lowry acid–base theory an acid is any specie which can donate H⁺. When an acid donates proton it is converted into conjugate base.
Example:
CH₃COOH + BASE → CH₃COO⁻ + Base-H
In above reaction Acetic Acid (CH₃COOH) is acid, and after loosing proton it is converted into conjugate base i.e. Acetate (CH₃COO⁻).
And according to Brønsted–Lowry acid–base theory base is any specie which can accept H⁺. When base accepts proton it is converted into conjugate acid.
Example:
NH₃ + A-H → NH₄⁺ + A⁻
In above reaction Ammonia (NH₃) is a base, and after accepting proton it is converted into conjugate acid i.e. Ammonium (NH₄⁺)
Noble gas is very unreactive, it seldom form compound with other elements unless in extreme pressure and temperature. It is because noble gas has a stable duplet or octet of electron, it has low tendency to lose or gain electrons. Therefore it is very unreactive