Answer:1. 5
Explanation: the element is boron and the atomic number is 5
Answer:
Explanation:
Let assume that the missing aqueous solution of 4-chlorobutanoic acid = 0.76 M
Then, the dissociation of 4-chlorobutanoic acid can be expressed as:
⇄ 
+ 
The ICE table can be computed as:
⇄ +
Initial 0.76 - -
Change -x +x +x
Equilibrium 0.76 - x x x
![K_a = \dfrac{[\mathsf{C_3H_6ClCO_2^-}] [\mathsf{H^+}]}{\mathsf{[C_3H_6ClCO_2H ]}}](https://tex.z-dn.net/?f=K_a%20%3D%20%5Cdfrac%7B%5B%5Cmathsf%7BC_3H_6ClCO_2%5E-%7D%5D%20%5B%5Cmathsf%7BH%5E%2B%7D%5D%7D%7B%5Cmathsf%7B%5BC_3H_6ClCO_2H%20%5D%7D%7D)
![K_a = \dfrac{[x] [x]}{ [0.76-x]}](https://tex.z-dn.net/?f=K_a%20%3D%20%5Cdfrac%7B%5Bx%5D%20%5Bx%5D%7D%7B%20%5B0.76-x%5D%7D)
where:
![3.02*10^{-5} = \dfrac{x^2}{ [0.76-x]}](https://tex.z-dn.net/?f=3.02%2A10%5E%7B-5%7D%20%3D%20%5Cdfrac%7Bx%5E2%7D%7B%20%5B0.76-x%5D%7D)
however, the value of x is so negligible:
0.76 -x = 0.76
Then:
x = 0.00479 M
∴
![x = \mathsf{[C_3H_6ClCO_2^-] = [H^+]=}](https://tex.z-dn.net/?f=x%20%3D%20%5Cmathsf%7B%5BC_3H_6ClCO_2%5E-%5D%20%3D%20%5BH%5E%2B%5D%3D%7D)
0.00479 M
= (0.76 - 0.00479) M
= 0.75521 M
Finally, the percentage of the acid dissociated is;
= ( 0.00479 / 0.76) × 100
= 0.630 M
Answer:
Explanation:
Physical and chemical properties of acids:
Acids are sour in taste.
All acids have pH less than 7.
All acids turns blue litmus paper red.
Acids react with metals and form salts.
HCl + Mg → MgCl₂ + H₂
Acids react with base and form salt and water.
HCl + NaOH → NaCl + H₂O
Acids react with carbonates and form carbon dioxide, water and salt.
2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂
Physical properties of bases:
All bases are bitter in taste.
They turn litmus paper from red to blue.
They are slippery.
All bases have pH above 7.
Bases react with acid and form water and salt.
NaOH + HCl → NaCl + H₂O
Bases conduct electricity.
Bases such alkali when react with water produces OH⁻.
In chemistry, the molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by its amount of substance. The base SI unit for molar mass is kg/mol. However, for historical reasons, molar masses are almost always expressed in g/mol.
Hope this helped!
Good luck :p
~Emmy <3
For an exothermic reaction,heat energy is released out.
Enthalpy change = Energy of products - Energy of reactants
Here enthalpy change is negative,as energy of products is less than energy of reactants.
Hence heat is released in exothermic reactions.
And the products have lower potential energy than the reactants, and the enthalpy change is negative.
