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chemistry lab final
| Question | Answer |
|---|---|
| BaCl_2 | yellow orange |
| SrCl_2 | bright red |
| MgCl_2 | no color |
| NaCl | bright yellow |
| CaCl_2 | yellow orange |
| LiCl | light purple |
| CuCl_2 | reddish orange |
| KCl | Bright deep red |
| What is the reason behind the color produced by each solution? | electrons are excited by heat to higher energy levels and release energy as light when returns ground level |
| Is the color dependent on the anion that is paired with the cation | no it is dependent on the cation bc the unique number of proteins create unique number of energy levels |
| reaction of the compound in the solibility tests | MgCL_2 +H_2SO_4 -> MgSO_4 +2HCl |
| what product salts were soluble in sulfuric acid | MgCl_2 and CaCl_2 |
| solubility trend? | sulfates become less soluble as you move down the periodic table |
| other than flam test and solubility data, what are other ways in which you can identify an unknown compound | adding acid to the compounds |
| what are products of a reaction of a carbonate salt with an acid | carbon dioxide |
| solute | any substance dissolved in the solvent |
| solvent | the component present in the largest amount |
| soultion | a homogenous mixture where 2+ components mix freely |
| concentration | ratio of solve to solvent in a solution |
| what is molarity formula | molarity= moles of solute/ liters of solution |
| what is the dilution formula | V dilute + M dilute = V concentration + M concentration |
| what color does red limus paper turn with acid/base/neutral | acid/ neutral= red, base=blue |
| what color does blue litmus paper turn with acid/base/neutral | base/neutral= blue acid= red |
| electrolytes | strong> bright light, weak> dim/flashing light, non-electrolyte= no light |
| what are the proper techniques for properly reading a buret | read at eye level to the nearest .01 mL at bottom of menicus |
| what happens in an acid-base reaction | water and salt |
| what ion is characteristic of an acid or base | H+= acid , OH-=base |
| what doe sthe phenolphalein indicator color tell you about a solution | turns from colorless to faint pink at the endpoint |
| equation for calculating the enthalpy | z^ products - reactants |
| endothermic | positive |
| exothermic | negative |
| energy equation | q= m x C x T |
| what is the purpose of ensuring that the water level inside and outside the flask in the same before removing the flask | ensuring levels prevents gas from being released and ensures atmospheric pressure |
| what is the ideal gas law | PV=nRT |
| Percent error | theroretical value- experimental / theoretical %100 |
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