Results showed all hypothesized ionic substances had

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while Sodium Chloride, Substance B and Substance D were all ionic compounds. Results
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showed all hypothesized ionic substances had high conductivity, high solubility, high melting point and a hard initial appearance. The results also showed all the substances hypothesized to have molecular compounds had low solubility, low melting point, low conductivity, and a soft initial appearance. It was concluded that the hypothesis was correct. The purpose of this lab was to test which substances are ionic compounds and which substances are molecular compounds by using solubility, melting point, conductivity and initial appearance. Materials and Methods First, the initial appearance was tested by writing down observations of the substances in solid form. Then, the solubility of a substance was tested. The substances were each mixed with water in a well on a microtitration plate. If they melted into the water then they had a high solubility, but if they remained crystals in the water, they had a low solubility. Next, conductivity of a substance was tested. The first step was to test the conductivity of water since this was the control. A conductivity apparatus was used for testing the conductivity of a substance. The apparatus makes a beeping sound, and it gets louder the more conductive a substance is. Water had the lowest beeping sound the apparatus can make implying it had very low conductivity. The electrodes of the apparatus were then dipped into the water-substance mixtures. If the beep of a substance mixture with water was louder than the beep of the regular water, it means it had a high conductivity. If the beep was the same volume as the water beep, then the substance had low conductivity.
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