Select the reagent that will separate the pairs of ions listed.

1. Ag+ and Al3+

2. Cu2+ and Ca2+

3. Mg2+ and K+

4. Ni2+ and Co2+

a) 6 M HCl

b) H2S, 0.2 M HCl

c) (NH4)2S, pH 8

d) (NH4)2 HPO4 in NH3

e) cannot be separated

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?