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In this lab, you will observe the properties of oil, cornstarch, salt, and sodium bicarbonate. You will use the properties to classify the substances as ionic and covalent.

*Restate this goal in the form of an investigative question.

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An ionic compound is a chemical compound dissociated into positive and negative ions, but globally neutral (it is a bond that usually involves a metal).


A covalent bond is a bond in which two valence electrons are shared between two non-metals (which is often the case in organic substances). In this type of bond, there must be an electronegativity difference of less than 1.7 on the Pauling scale.


Returning to the question, the first question to investigate is if the substance is simple or compound (all of them are compound).


The next question for the substances is if there's a metallic atom or a carbon atom in the substance.


The next investigation is a confirmation, by calculating the electronegativity difference between the atoms in the substances according to Pauli's scale. If it's under 1.7, it's a covalent bond, so a covalent compound. if not it's an ionic bond, so an ionic compound.

The ionic compounds are salt and sodium bicarbonate. The covalent compounds are oil and cornstarch.

The ionic or covalent bond in the structure can be assessed in the laboratory by dissolving the compounds in the water.

The ionic compounds on dissolution will disintegrate into the positive and negative ions.

  • The oil dissolving in the water will float onto it, thus the compound did not dissociate and has a covalent bond in the structure.

  • The cornstarch is a carbohydrate moiety and on dissolving in the water will be unable to disintegrate. The compound is composed of a covalent bond.

  • The salt on dissolving in water completely dissociates and becomes soluble. The compound disintegrates into the constituent ions. Thus, salt is an ionic compound.

  • The sodium bicarbonate is also an ionic compound, as it dissociates into the water.

The investigation question will be: Which of the following compound has an ionic and covalent bond.

For more information, refer to the link:

https://brainly.com/question/14614762

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