pre-lab 3

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EXPERIMENT 3 Name: Flame Tests & Electron Configuration
Pre-Laboratory Questions and Exercises
Due before lab begins. Answer in the space provided.
1. Write electron configuration for the alkali metals Li, Na, K, and Rb.
Li ____He 2s1_____________________________________________
Na ____Ne 3s1______________________________________________
K _______Ar 4s1___________________________________________
Rb _______Kr 5s1___________________________________________
2. Write the electron configuration for strontium and the strontium(II) ion.
Sr ___________ 1s2 2s2p6 3s2p6d10 4s2p6 5s2 ______________
Sr2+
______________ 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 ____________________
3. Name the colors in visible light, beginning with that of highest energy (shortest wavelength).
Red, orange, yellow,blue,indigo,violet
4. What is the maximum number of electrons the first four energy levels can hold? n=1 ___2____ n=2 ___2____ n=3 _6______ n=4 ___2____
5. What is monochromatic light?
Monochromatic light has one color wavelength and it is confined to an extremely narrow range.
EXPERIMENT 5 Name: Double Replacement Reactions
Pre-Laboratory Questions and Exercises
Due before lab begins. Answer in the space provided.
1. Write the positive and negative ions that result when the following compounds are dissolved in
Aqueous solution: CaCl2 (aq) Ca2+ (aq) + 2 Cl–(aq)
Na2S (aq) _________Na+1 S2- _____________________________________
(NH4)2CO3 (aq) __________(NH$)+3 CO3-2____________________________________
K2SO4 (aq) ____________K+1 SO4-2__________________________________
2. Using the solubility rules, predict the solubility of each of the following compounds in water.
(aq = soluble (aqueous solution), s = insoluble solid)
a) CaCO3 __A____ b) Al(OH)3 __S____ c) Hg2Cl2 _S_____ d) Cu(NO3)2 __A____
3. Write the complete ionic and net ionic equations for the following reaction:
Pb(NO3)2 (aq) + 2 NaI (aq) PbI2 (s) + 2 NaNO3 (aq)
Complete Ionic Equation:Pb+

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