Introduction The purpose of the lab was for students to, using a given graph of solubility, decipher whether an unknown substance is NaCl, NaNO2, or KNO3. Students were not given a procedure, so they had to design their own. Materials included beakers, a hot plate, a balance, a thermometer, a graduated cylinder, and a stirring rod. Solubility- ability for a solute to dissolve in a solvent Solubility Curve- a graph of the variation of changing temperature of the solubility of a given substance in a given solvent Solute- smaller component of a solution that is dissolved into a solvent Solvent- larger component of a solution that dissolves the solute Solution- liquid mixture where the solute is evenly dispersed in the solvent Saturated Solution- solution containing the maximum concentration of a solute dissolved in the solvent Our Set-Up Procedure 1) We first obtained materials: beakers, a hot plate, a balance, a thermometer, a graduated cylinder, an...
Pre-lab and Data Tables Calculations and Results 2) Explain the differences in the difference in temperature of these substances as they evaporated. Explain your results in terms of intermolecular forces. There are differences in the temperature of the substances as they evaporated is because of the different heat absorptions. In order to change a liquid to a gas, you must have enough energy to break the intermolecular bonds of the liquid. As the liquid evaporated into gas, it absorbs energy, in the form of heat, from the temperature probe. When the substance absorbed in the filter paper was evaporating, whether the drop of the temperature would be drastic or mild was due to how much energy was needed to break the intermolecular bonds. 3) Explain the difference in evaporation of any two compounds that have similar molar masses. Explain your results in terms of intermolecular forces. The difference in evaporation of any two compounds that have similar ...
1. Why is it important that only the wick and not the filter paper circle be in contact with the water in the cup? It is important so the water could be spread from the center to the edge and create a pattern. If the filter paper circle is in contact with the water, then there wouldn't be a directional flow, and there wouldn't be a clean design. 2. What are some of the variables that will affect the pattern of colors produced on the filter paper? Some variables are the brand of the ink, the distance the ink was placed from the center, what type of design was drawn (dots, lines, squigly lines), and the size and thickness of the dots and lines made. 3. Why does each ink seperate into different pigment bands? Each ink seperates into different pigment bands because depending on their characteristic physical properties, they travel up the filter paper and diffuse at different rates. The partitioning of the components of the mixture between solvent and the filter paper dete...
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