Answer:
Net force.
Explanation:
Net force is the total force exerted on an object by another object.
Answer:(4) Dust particles provide surfaces on which
water vapor can condense
Explanation:
During condensation of clouds dust particles provides spaces where water vapor may condense.
A. Side B has higher concentration of particles than side A
Answer: 2.8 moles of copper (Il) sulfide
will be produced from 2.8 moles of sulphur.
Explanation:
The balanced chemical reaction is:
According to stoichiometry :
1 mole of
produce = 1 mole of copper (Il) sulfide
Thus 2.8 moles of
will produce=
of copper (Il) sulfide 
Thus 2.8 moles of copper (Il) sulfide
will be produced from 2.8 moles of sulphur.