There are different experiments that we have to do and we have to make a hypothesis and answer the questions. Can u please make up the hypothesis.
Experiment A:
Purpose: to observe the shape of an ionic solid and a covalent solid.
Hypothesis: I think the ionic solid will/will not display a regular orderly crystal shape. The reason I think this is ……
*This experiment uses salt( ionic bond) and sugar (covalent bond)*
Which solid has greater definition and regularity?
Which solid is a crystal lattice with intermolecular bonding?
Draw the intermolecular bonds of the crystal lattice stricture.
How would intermolecular bonding change the physical properties of substance?
Using your results from this test make one inductive conclusion about the geometric shape of ionic and covalent solids.
Experiment B:
Purpose: to test which substance is harder the ionic solid or the covalent solid.
Hypothesis: I think the ionic/covalent solid will be the hardest. The reason I think is…..
*This experiment uses salt( ionic bond) and sugar (covalent bond)*
-Which solid was harder to break?
-Which solid has larger and more regular cleavage planes?
-Explain why cleavage planes on molecules of one type of bonding would differ in their hardness from molecules of another type of bonding.
- Can you imagine a case where an ionic solid and a covalent solid might be equal in their hardness? Describe the molecular structure of these (imaginary or real) example substances.
Experiment D :
Purpose: To test which of the two solids has a higher melting point.
Hypothesis: I think the ionic/covalent solid will have the highest melting point. The reason I think this is ….
*This experiment uses salt( ionic bond) and sugar (covalent bond)*
-Which substance melted faster?
- Consider the molecular bonding of the substance in question ! And use what you know about bonding to explain why one sample melted at a lower temperature than the other substance?
- Using your results from the test, make one inductive conclusion about the melting points of ionic and covalent solids.
Experiment E :
* This experiment uses oil and water*
Purpose: to test the capillary action of polar and nonpolar liquids.
Hypothesis: I think the polar/ nonpolar liquid will have the greater capillary action. The reason I think this is ……
-Which liquid was able to move up the capillary tube easier?
-Explain how this liquid moved up the tube without a vacuum or other force being applied to the tube externally.
-Using your results from this test, make one inductive conclusion about intermolecular cohesion of polar and nonpolar liquids.
Experiment F:
* This experiment uses oil and water*
Purpose: to test the surface tension of polar and non-polar liquids.
Hypothesis: I think the polar/ nonpolar liquid will have the greater surface tension. The reason I think this is ….
-which liquid has greater surface tenison?
-Using a diagram and a written description, explain why this liquid has greater surface tension.
- Using your results from this test make one inductive conclusion about intermolecular cohesion of polar and nonpolar liquids.
Experiment G:
* This experiment uses oil and water*
Purpose: to test the ability of polar and non-polar liquids to dissolve an ionic and a covalent solid.
Hypothesis: I think….
The reason I think this is …..
-Which liquid was a greater solvent?
-Using a diagram and a written description, explain how the electro negativity of this molecule increases its solvent ability.
-Using your results from this test make one indictive conclusion about the solvent of polar and nonpolar liquids.