Answer:
The concentration of A in the concentrated solution is 0.05864
Explanation:
Given
Volume 1 = V1 = 2.00mL
Volume 2 = V2 = 25.00mL
Absorbance 1 = A1 = ?
Absorbance 2 = A2 = 0.733
Beer's law states that the concentration of a chemical solution is directly proportional to its absorbance.
i.e.
V = kA where V = Volume (Concentration)
A = Absorbance
k = Constant
Make k the subject of formula
k = V/A
V1/A1 = V2/A2
Make A1 the subject of the formula
A1 = V1 * A2/V2
Substitute the values of V1, A2 and V2
A1 = 2 * 0.733/25
A1 = 0.05864
So, the concentration of A in the concentrated solution is 0.05864
Answer:
With four rope segments, the ideal mechanical advantage is 4. This means that the compound pulley multiplies the force applied to it by a factor of 4.
Explanation:
Answer:
5.90
Explanation:
Initial moles of CH3COO- = 10.0/1000 x 0.75 = 0.0075 mol
Moles of HCl added = 5.0/1000 x 0.10 = 0.0005 mol
CH3COO- + HCl => CH3COOH + Cl-
Moles of CH3COO- left = 0.0075 - 0.0005 = 0.007 mol
Moles of CH3COOH formed = moles of HCl added = 0.0005 mol
pH = pKa + log([CH3COO-]/[CH3COOH])
= -log Ka + log(moles of CH3COO-/moles of CH3COOH)
= -log(1.78 x 10^(-5)) + log(0.007/0.0005)
= 5.90
Answer:The energy of the molecules in the computer decreases.
Explanation:LET ME KNO IM WRONG
By convention, the symbol Z is assigned to the number of protons in the nucleus, or simply, the atomic number of an element. This is actually used when you want to determine the effective nuclear charge of a specific electron of an element. The equation is:
Z* = Z - S
where
Z* is the effective nuclear charge
Z is the atomic number
S is the number of electrons between the electron in question and the nucleus
There is due to a phenomenon called the shielding effect. This effect states that the farther the electron is from the nucleus, the lesser is its pull of force to the nucleus. That is the reason why the valence electrons (outermost electrons) are the ones always involved in chemicals reactions. Because they are not that strongly bonded to the nucleus of an atom.
