250 kJ of energy are removed from a 4.00 x 10^2 g sample of water at 60°C. Will the sample of water completely freeze? Explain

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The excretory system,need answers for all: )

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)