8. what must occur for osmotic forces
to cease across a cell membrane?
a. equilibrium. b. diffusion.
c. dehydration
d. active transport.

Explanation:

Osmotic force results in the movement of solvent from a region of high concentration to that of a lower concentration through a semi-permeable membrane.

For osmotic force two be set up, the two system of solvent must be at different concentration. When the solvents have a uniform concentration, osmotic force ceases.

Therefore, a system in which no change in concentration occurs is an equilibrium system. Such a system has no osmotic force.

answer: they produce more slow than unicellular organisms.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2