Make a general rule about the effects of concentration of reactants on reaction rates.

As the concentration of reactants increases, the reaction rate increases as well. This is because, the concentration and reaction rate have a direct relationship. The concentration basically refers to “the amount of reactant particles.” If the amount of reactant particles is increased, then the frequency of successful collisions would additionally increase, for there would be more particles to collide amongst one another. If more particles are colliding, the amount of reactions are therefore increasing.

The answer is:   [d]:   "ultraviolet" {"  uv  "} .

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.