Answer : The molarity of the NaOH solution is, 0.00687 M.
The balanced chemical reaction will be:
Using neutralization method :
are the n-factor, molarity and volume of acid which is
are the n-factor, molarity and volume of base which is NaOH.
We are given:
Putting values in above equation, we get:
Hence, the molarity of the NaOH solution is, 0.00687 M.
The electrons are excited because:
1.- They posses more energy than the basal form, but this doesn´t mean that they can easily react, remember, the electrons are the outside part of an atom.
2.- By the time, this electrons are loosing their energy, that mean that they return to the basal form.
Filtration is a type of process in which components of a mixture are separated based in the size. The sea water and sand can be separated by filtration due to different particle size.
Seawater is a mixture of several substances, including salt, sand, and stones. The substances of seawater can be separated via filtration. The filter paper in this technique separates the substances based on the size of particles.
The filtration separates sand and seawater as:
Therefore, difference in the particle size allows the separation of seawater and sand.
To know more about filtration, refer to the following link:
Answer: The correct answer is Option b.
Ionic compound is defined as the compound which is formed by the complete transfer of electrons from one atom to another atom. These compounds are usually formed between metals and non-metals.
Covalent compounds are defined as the compounds which are formed by the sharing of electrons between two atoms. These compounds are formed between two non-metals.
The nomenclature of covalent compound is given by:
The nomenclature of ionic compounds is given by:
For the given compounds:
(I) : This is an ionic compound and hence, its name is lithium nitride.
(II) : This is a covalent compound and hence, its name is hydrogen sulfide.
(III) : This is a covalent compound and hence, its name is sulfur dioxide.
(IV) : This is an ionic compound and hence, its name is aluminium fluoride.
Hence, the correct answer is Option b.
In order to solve this, you need to use the expression to calculate half life, which is the following:
C = Co e^-t λ (1)
C: concentration after t has passed
Co: initial concentration
t: time that has passed
λ: lambda which relation half life time
λ this can be calculated with the following expression:
λ = ln2 / t(1/2) (2)
So, let's calculate λ first and then, the concentration. In this case, we will assume that we begin with a concentration at 100%.
The value of lambda is:
λ = ln2 / 12.3
λ = 0.0564
Now, let's use (1) to calculate the concentration after 49 years:
C = 100 e^ (-49 * 0.0564)
C = 100 e^(-2.7636)
C = 6.31 %
And this will be the tritium remaining after 49 years