flame test with powders and flares demo
Flame test & Spectrum lab Name_______________________pd____
Discussion: Many compounds are made of metals and nonmetals. In this case, the metal is always the first element in the compound. Many metal ions give distinctive flame colors, and can be identified from them.
Procedure: In this lab you and your lab partner will rotate through the stations, putting some of the liquid in the fire, and recording the flame color. You will also record the compound and metal ion present. On the unknowns, you will record the flame color, then use the results of your known compounds to identify the unknown metal ions.
make this table and record your data
Conclusions:
List symbols and names of 7 metals present. Each of the samples we tested is actually a mixture of compound dissolved in water, much like NaCl(aq) .
List symbol, name, and charge of the of the polyatomic ion that is in the compound with each metal ion.
Pick one formula that contains a parenthesis and count the number of atoms in that formula.
Why is it important to avoid mixing samples?
Sometimes when pennies are heated, a green flame is seen. Why?
Why are some of the unknowns difficult to identify?
p788 (e book r3-4) .... what color is a sodium vapor lamp?
Read page 794-795 (e text r-10-11-at back of book), then summarize what you have learned about fireworks and flares. What do these pages have to do with the lab?
Mole practice; show work, label
1. # atoms in 4 moles of Silicon
2. mass of of 3 moles of silicon
3. # atoms in 54g of aluminum
4. mass of 12.04 *10^23 atomsof Bromine