Weakest NaH < H₂S < H₂Te < HI strongest
NaH is a strong base, it is not acid at all, it ionized to give Na⁺ and H⁻
From up to bottom in periodic table size increases so dissociation of H⁺ becomes easier for larger anions so HI and H₂Te are stronger acids than H₂S
I is more electronegative than Te, So it is easier to lose H⁺ from I than from Te
Answer:
Incorrect
Explanation:
X is the reactants
Y is the products
In an endothermic reaction where energy is absorbed, the enthalpy the products (Y) is always higher than the enthalpy of the reactants (X).
Enthalpy change (∆H) = products (Y) - Reactants (X)
For an endothermic reaction, the ∆H value should be positive.
Enthalpy change
The diagram sketched by the students shows the opposite. The diagram shows that the enthalpy of the products (Y) is lower than the enthalpy of the reactants (X). This will give a negative value of ∆H.
It represents an exothermic reaction rather than endothermic.
Therefore, the student is incorrect.
Answer:
When a buzzer is associated with some kind of circuit and one press the key then the completion of the circuit takes place. As a consequence, the current will begin to flow from the cell or the battery and moves towards the buzzer. Therefore, the sound is generated by the buzzer because of the flow of the electrical charge through it.
After going through the buzzer, the electric charges again moves towards the battery. Thus, the electric charges move in the complete circuit.
A, because it is one of only a few on the periodic table that are liquid at room temperature and normal pressure