Answer:
Neutrons = ( Atomic mass – Atomic number ) ( A–Z )
Protons and Electrons are equal to the atomic number
For example Neon,
Mass number (A) = 20
Atomic Number (Z) = 10
Number of Protons = 10
Number of Electrons = 10
Number of Neutrons = ( A–Z ) = 10
Electronic distribution :
K= 2
L= 8
Answer:
ΔpH = 1.25
Explanation:
Using Henderson-Hasselbalch formula:
pH = pka + log [CH₃COONa] / [CH₃COOH]
pH = 4.74 + log [0.112] / [0.112]
<em>pH = 4.74</em>
The reaction of sodium acetate (CH₃COONa) with HCl is:
CH₃COONa + HCl → CH₃COOH + NaCl
<em>Producing acetic acid, </em>CH₃COOH.
If 0.1mol of HCl reacts the final moles of CH₃COONa are:
0.112mol - 0,1 mol = 0.012mol
Moles of acetic acid are:
0.112mol + 0,1 mol = 0.212mol
Using Henderson-Hasselbalch formula:
pH = pka + log [CH₃COONa] / [CH₃COOH]
pH = 4.74 + log [0.012] / [0.212]
<em>pH = 3.49</em>
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Change in pH, ΔpH = 4.74 - 3.49 =<em> 1.25</em>
I hope it helps!
Burning gas is a chemical change and evaporation of gas is physical change.
Answer:
Explanation:
Chemical equation:
FeCl₃ + NaOH → Fe(OH)₃ + NaCl
Balanced chemical equation:
FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl
Step 1:
FeCl₃ + NaOH → Fe(OH)₃ + NaCl
Fe = 1 Fe = 1
Cl = 3 Cl = 1
Na = 1 Na = 1
OH = 1 OH = 3
Step 2:
FeCl₃ + 3NaOH → Fe(OH)₃ + NaCl
Fe = 1 Fe = 1
Cl = 3 Cl = 1
Na = 3 Na = 1
OH = 3 OH = 3
Step 3:
FeCl₃ + 3NaOH → Fe(OH)₃ + 3NaCl
Fe = 1 Fe = 1
Cl = 3 Cl = 3
Na = 3 Na = 3
OH = 3 OH = 3
Now we the equation is completely balanced and follow the law of conservation of mass because there are equal number of atoms of each elements are present on both side.
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction
.
Type of reaction:
It is double displacement reaction.
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
