4. Where is the end of the wire placed when performing a flame test? 5. Which element occurs as an impurity and gives a weak yellow flame test? 6. Which three halides are investigated in this experiment? 7. Is water and hexane miscible or immiscible? 8. Is the halide test observed in the upper layer or lower layer? 9. Refer to Figure 7.3 to answer the following. (a) Which halide is indicated by an orange upper hexane layer? (b) Which halide is indicated by a clear upper hexane layer? (c) Which halide is indicated by a parple upper hexane layer? 10. What safety precautions should be observed in this experiment