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?
Go to p787, create a table, and record the flame colors of the group 1 elements that are pictured. p788 (e book r3-4) .... what color is a sodium vapor lamp?
Read page 789. What is the main point? Go to page 791. Read the paragraph, then do the questions 1-10. What is hypertension? What does it have to do with salt?
Go to page 793 , add the flame colors these group 2 elements to the table you started with group 1 elements. Read 794-796. How do fireworks rocket into the sky? How do fireworks get the different colors? What causes the bright light in flares? What causes the red color of flares? Why is calcium important? Why disease is caused by lack of calcium? Why is magnesium important? Where does most of our magnesium come from?
Go to page 130. Read objectives, materials and background information. How will the unknown solutions be identified? No need to read preparation and procedure, we will use a slightly different procedure in class. Answer extension questions 1&2 from page 131.
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 atoms of Bromine