Period 5 has 5 energy levels and Period 6 has 6 energy levels
Answer:
Common diatomic molecules include hydrogen (H2), nitrogen (N2), oxygen (O2), and carbon monoxide (CO). Seven elements exist as homonuclear diatomic molecules at room temperature: H2, N2, O2, F2, Cl2, Br2, and I2. The bond in a homonuclear diatomic molecule is non-polar due to the electronegativity difference of zero.
Answer:
Option b=> 0.1 M CH3COOH , 0.1 M CH3COONa.
Explanation:
In chemistry, when an acid or a base(alkali) is added to a solution and the solution pH does not change then we say that the solution is a BUFFER SOLUTION (that is a solution, upon the addition of acid or base will show resistance in pH value).
In order to be able to answer this question efficiently we have to consider the mathematical representation or Equation below;
pH = pKa + log ( [ A^-] / [HA] )--------------------------------------------------------------------(1).
What the mathematical representation or Equation (1) above is telling is is that if [A^-] or [HA] is high then there will be the production of buffer with higher buffer capacity.
Answer:
0.65atm or 65.3kPa
Explanation:
Given parameters:
Initial volume of He = 500mL
Initial pressure = 98kPa, this gives 0.967atm
Final volume = 750mL
Unknown:
Final pressure = ?
Solution:
A good grasp of Boyle's law should suffice here. The law states that:
"the volume of a fixed mass of gas varies inversely as the pressure changes if the temperature is constant".
Mathematically;
P₁ V₁ = P₂ V₂
where P and V are pressure and volume
1 and 2 are the initial and final states;
Now, solve for the unknown P₂;
0.967 x 500 = P₂ x 750
P₂ = 0.65atm or 65.3kPa
