Answer;
Active transport
Explanation;
Movement of solute from a 0.2% solute concentration solution to a 0.4% solute concentration solution is an example of active transport.
-Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient - and therefore require an input of energy from the cell.
-During active transport, a protein pump uses energy, in the form of ATP, to move molecules from an area of low concentration to an area of high concentration.
Molality is defined as the number of moles of solute in 1 kg of solvent.
molality of solution to be prepared is 0.50 molal
this means that in 1000 g of water there should be 0.50 mol of NaCl
if 1000 g of water should contain - 0.50 mol
then 750.0 g of water requires - 0.50 mol/kg x 0.750 kg = 0.375 mol
mass of NaCl in 0.375 mol - 58.5 g/mol x 0.375 mol = 21.9 g
therefore a mass of 21.9 g of NaCl is required
Answer:
Copper
Explanation:
Because copper conducts a lot of electricity, and gets the most electrons
There are 4 electron pairs (3 bonding and 1 lone pair) so the angle is 107 degrees. The 4 electron pairs are repelled to give a tetrahedral arrangement but the molecule has a pyrimidal shape due to the lone pair.
C=1.7M; M=58.5gmol-¹; V=400ml=400g; m=?
C=n/V
but n=m/V
=>C=m/MV
=>m=CMV
=1.7 x 58.5 x 400
=39780g