A fixed pulley is different from a moveable pulley because a moveable pulley has one end of the rope attached to it fixed on an unmoving object, the pulley is free to move with the rope. You pull the other end of the rope. Also, a moveable pulley multiplies the applied force (effort force) and therefore has more mechanical advantage. A fixed pulley is attached to something that doesn't move
The substance present in the smallest amount in a solution is the solute; it is the substance that is dissolved. While the solvent is the substance present in the largest amount in a solution, it is the substance that does the dissolving. A solution is a homogeneous mixture formed when one substance dissolves in another.
In molecules with the same number of electron groups but different molecular geometries, One of the chances is that the central atoms alter in the way in which their electrons are arranged.
Explanation:
- Consider molecules with steric number = four sets of electrons around the central atom.A tetrahedral geometry with 109.5 deg bond angles is predicted by VSEPR
- NH3 is pyramidal with a lone pair on one end of the tetrahedron. The HNH angle is 107.3 deg, generally described by stating that the lone pair is fatter than the pairs that bond.
- PH3 is also pyramidal, the HPH angles are close to being 90-degree angles.
- The assumption is that the small atoms (like C and N) use hybrid sp3 orbitals to form the bonds with hydrogen in their compounds. All N and P merely make three ammonia and phosphine bonds.
- The hydrogens remain further apart if the nitrogen uses hybrid orbitals. Phosphorus is large enough that the hydrogens don’t associate too much in phosphine. Since the P doesn’t have to exhaust the energy required to hybridize its bonding orbitals.
Answer:
The pH of the solution is 4.69
Explanation:
Given that,
Mass of potassium = 2.643 grams
Weight of water = 50.00 mL
Weight of HCl=100.00 ml
Mole = 0.120 M
We know that,
is a basic salt.
Let's write it as KY.
The acid would become HY.
We need to calculate the moles of KY
Using formula of moles
The reaction is
The number of moles of KY is 20.98 m
initial moles = 20.98
Final moles
We need to calculate the value of pKa(HY)
Using formula for pKa(HY)
We need to calculate the pH of the solution
Using formula of pH
Put the value into the formula
Hence, The pH of the solution is 4.69
Answer:35
Explanation:because 10x10