Chem 1LD Practical Review with correct answers 100% 2026

Chem 1LD Practical Review with correct answers 100% 2026 Calculate the mass of water - Correct Answer m= mass of flask w/ water - mass of empty flask calculate the density of water in the 10 mL volumetric flask - Correct Answer D = mass of water / 10 mL volumetric flask calculate the mass of ethanol - Correct Answer m = mass of flask w/ ethanol - mass of empty flask calculate the density of ethanol - Correct Answer D = mass of ethanol / 10 mL volumetric flask calculate the mass of each mixture in the 10 mL volumetric flask - Correct Answer m = mass of flask with mixture - mass of empty flask calculate the density of the mixture - Correct Answer d = mass of mixture / 10 mL volumetric flask calculate the mass of each mixture in the erlenmeyer flask (i.e. "15+5" ethanol + water mixture) - Correct Answer m = (V*D of ethanol) + (V*D of water) calculate the "actual volume" of each mixture in the Erlenmeyer flask - Correct Answer Actual volume = mass of erlenmeyer's mixture / density of mixture calculate the "additive volume" of the ethanol-water mixture in the Erlenmeyer flask - Correct Answer V(additive) = V(water) + V (Ethanol) calculate the percent change in volume for the water, the ethanol, and the mixture. Indicate whether the actual volume is decreasing or increasing - Correct Answer Percent change in volume = (Actual volume - additive volume) / additive volume * 100 calculate the mole fraction of ethanol in the mixture - Correct Answer moles of ethanol / (mole of ethanol + moles of water) What does the sign of % change in volume indicate about the intermolecular forces of the mixture in compariosn with the pure ethanol or water - Correct Answer The negative sign of percent change in volume shows that the intermolecular forces of the mixture are strong in comparison with pure ethanol and water. in the mixture, there are london dispersion forces as well as hydrogen bonds. these intermolecular forces draw the solutions together because hydrogen bonds are the strongest intermolecular force. In comparison, these bonds make the solutions come together tightly, causing the percent change in volume to be negative due to the bond's strength How to set up a labquest for Experiment 2 Pressure vs Temperature - Correct Answer Plug the temperature probe into CH:1 and the pressure sensor into CH:2 In the graph screen, click graph -- graph options -- change: x-axis column to "temperature" under graph 2 -- y-axis, unselect CH:1 Temperature