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Experiment 2: Identification of a Compound: Chemical Properties Exam (A+ Graded Scores)
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Experiment 2: Identification of a Compound: Chemical Properties Exam (A+ Graded Scores)
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Experiment 2: Identification of a Compound:Chemical Properties Exam (A+ Graded
Scores)
Pre: What is the criterion for clean glassware? - -Having no residual
chemicals that could potentially effect the outcome of an experiment.
- What is the size and volume of a "small, clean test tube"? - -size - 75mm
volume - 3mL
- Describe the technique for testing the odor of a chemical. - -Wafting:
Placing your hand above the test tube and using circular motion to wave the
air towards your face.
- Identify at least five observation that are indicative of a chemical reaction -
-1. gas evolves
2. precipitate appears or disappears
3. heat is given off or absorbed
4. a change in odor
5. a change in color
- Depending upon the tip of a dropper pipet, there are approximately 20
drops per milliliter of water. The experimental procedure, Parts A and B,
indicates the addition of 5-10 drops of each solution to the test tubes.
Calculate the volume range in millimeters for the solution. - -1mL = 20
drops (.05 mL per drop)
5(.05)-10(0.5) =0.25 mL to 0.50 mL range
- The substance NaCL, Na2CO3+, MgSO4+, and NH4Cl, which are used for
test solutions are soluble ionic compounds. For each substance, indicate the
ions present in the respective test solution. - -NaCl: Na^+Cl^-
Na2CO3: CO3^2-
MgSO4: Mg^2+SO4^2-
NH4Cl: NH4+Cl-
- Post: Identify a chemical reagent used in this experiment that can be used
to distinguish solid CaCl2 (soluble) from solid CaCO3 (insoluble). What is the
distinguishing observation? - -The chemical reagent used in this experiment
that would distinguish CaCl2 (soluble) from CaCO3 would be Hal. If HCl is
added CaCO3 will fix and CaCl2 will not. So the distinguishing observation
would be fizzing which indicates the creation of a gas.
- What test reagent used in this experiment will distinguish a soluble Cl- salt
from a soluble SO42- salt? What is the distinguishing observation? - -Silver
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