Question

1. Refer to Data Table A.2 and state the solutions that produce reactions similar to (a) Li State the elements in this experiment that belong to: (a) Group IA/1 (b) Ba 2. (b) Group IIA/2 An unknown solution gives a brief green flame test. The unknown gives a white precipitate with ammonium carbonate, ammonium phosphate, and ammonium sulfate. The halide test produces a purple color in the upper hexane layer. Identify (a) the alkali or alkaline earth element, and (b) the halide present in the unknown solution. 3. 4. An unknown solution gives a scarlet-red flame test. The unknown gives no reaction with ammonium carbonate, ammonium phosphate, and ammonium sulfate. The halide test produces an orange color in the upper hexane layer. Identify (a) the alkali or alkaline earth element, and (b) the halide present in the unknown solution. An unknown solution gives a brick-red flame test with flashes of yellow. The unknown gives a white precipitate with ammonium carbonate and ammonium phosphate, but no reaction with ammonium sulfate. The halide test produces no reaction in the upper hexane layer. Identify (a) the alkali or alkaline earth element, and (b) the halide present in the unknown solution. . Fireworks are produced by gunpowder and chemicals in a rocket shell that is fired into the air and exploded. Based on your experimental observations, which elements could produce the following colors of fireworks? . (a) bright red (b) yellow

Answer 1

Q3. (a) Barium, Ba

(b) Iodine, I₂

compound can be BaI₂

Q4. (a) Strontium, Sr

(b) Bromine, Br₂

Q5. (a) Calcium, Ca

(b) Chlorine, Cl₂

Compound can be CaCl₂

Q6. (a) Lithium

(b) sodium