Answer:
It’s false
Explanation:
it could be true if the question mentioned alkaline solution
Answer:
there are 18 electrons in the outermost shell of argon atom
Answer:
The law of definite proportions
Explanation:
The law of definite proportions states that atoms combine in a molecule in a specific molar ratio or specific stoichiometry. For example, it's proved that regardless of the quantity we take, two hydrogen atoms always combine with one oxygen atom to form a water molecule.
Similarly, ionic substances follow the same pattern. Since the net charge of ionic salts should be equal to 0 and each element has a definite number of valence electrons in its shell all the time, the ions combine in a way, so that cations balance the charge of anions.
Essentially, the law of definite proportions is applicable and will be applicable in the future, since we know that each element has a fixed number of valence electrons in its ground state.
Answer:
b. John has to pour each liquid into a container with the same mass and then compare them
would be the correct answer. Hope this helps!
Explanation:
Answer : The value of 
for the reaction is, -390.3 kJ
Explanation :
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The main chemical reaction is:
The intermediate balanced chemical reaction are:
(1) 
(2) 
(3) 
Now we are reversing reaction 1, multiplying reaction 3 by 2 and then adding all the equations, we get :
(1) 
(2)
(3) 
The expression for enthalpy change for the reaction will be,
Therefore, the value of for the reaction is, -390.3 kJ
