General Chemistry I Practical Exam

Name:

CRN:

1. Identification:

• Classify the following mixtures as homogeneous (solutions) or heterogeneous:

• Match the glassware to the label.

• A.Weigh out 2.5 g of NaCl. Record your final measurement: __________________
• Record the volume of a liquid in a 10 mL graduated cylinder: ________________
• Record the volume of a liquid in a 50 mL graduated cylinder: ________________
• Record the temperature of a liquid using a thermometer: ___________________

• Select all the equipment for gravity filtration. Demonstrate how it works.

• Select all the equipment and materials required for determining if a substance is acidic, basic or neutral. Demonstrate how it works.

• Select all the equipment and materials required to make a saturated alum solution. Demonstrate how it is done.

• Select all the equipment and materials required to determine the heat exchanged using a constant pressure (coffee cup) calorimeter. Demonstrate how it is done.

• Propose a method for collecting the gas formed in a reaction. Select the equipment required for the process.

General Chemistry I Practical Exam

(Written portion)

Name:

CRN:

4. Data Analysis:

• Create a 5-layer density column using any of the substances listed in the table.

• A student separated a mixture of salt and sand to recover 16.32 g of salt and 7.44 g of sand. Calculate the percent composition of the mixture.
• A student performs the decomposition of baking soda starting with 137.53 g of baking soda (NaHCO₃) and upon the completion of the experiment collects 82.11 g of sodium carbonate. Calculate the percent yield of the reaction using the balanced chemical reaction below.

NaHCO₃(s)    Na₂CO₃(s) + CO₂(g) + H₂O(g)

• A student reacts 5.63 g of baking soda (NaHCO₃) with 25 mL of 0.83 M acetic acid solution. Identify the limiting reactant in this experiment.
• Fill out the following table by proposing an experiment that will help determine if a substance is polar or nonpolar. Using your previous experience working with that substance, classify the substance as polar or nonpolar.