If substance get smaller (more dense) as they get colder, why does water EXPAND when it freezes (make it cooler)?

Explain how carbon monoxide can cause death

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need