Chemistry Lab 4-4

Beran, J. A. Laboratory Manual for Principles of General Chemistry. 8th ed. Hoboken, NJ: John Wiley & Sons, Inc.; 2009

Data Tables and Observation: Fill out the data sheet (below) for the experiment and submit with this form. Recording data carefully

Procedure: Have you made any changes to the procedure? Please explain. If you made no changes, state so. (1 point)

1. Start Virtual ChemLab and select Boyle’s Law: Pressure and Volume from the list of assignments. The lab will open in the Gases laboratory.

Determining the Molar Volume of a Gas Anita Lau Partner: Anthony Yuen Ms B. IDC4U 24 April, 2015 Purpose: In this experiment, the molar volume ( the volume occupied by one mole of a gas) of hydrogen gas at standard temperature and pressure is measured. According to Avogadro's Law, at the same temperature and pressure, equal volumes of gases contain the same number of molecules. Therefore the volume of any given gas must be proportional to the number of moles of molecules present when the temperature and pressure are constant.

The class performed the changing pressure and volume part of the experiment through a special device that runs lab quest. We attached a 60mL syringe with 20 mL

...Properties of Gases General Chemistry 1 Lab 5 Abstract: The purpose of this experiment is...

Finding and balancing equations to find the ideal gas constant using PV=nRT. Using Excel to format and graph various types of data, both given and calculated. The data given for the decomposition of NaHCO3 and Na2CO3 provided the information needed to determine the experimental constant “R” that can then be compared to the textbook definition of “R”.

In the fourth stage of this experiment, the density of a gas was determined. A 250ml flask was weighed with an empty rubber balloon and the mass was recorded.

Use data from Table 13.4 to calculate the freezing and boiling points of the following solutions.

The average was then placed over 10.00mL to obtain a density calculation of the solution. The final part of our experiment was to estimate how many beads were in a certain container through the use of an analytical balance and a top loaded balance. Each balance has a different uncertainty in its ability to weigh accurately and we were tasked with finding out which device would be more accurate. I performed this experiment by taking the total mass of the container, the mass of 1 bead, the mass of 10 beads and the mass of 20 beads on each balance and then using arithmetic to calculate the total number of beads at each interval and create an estimate to how many beads were in the

Rinse the graduated cylinder with some tap water. Then rinse the graduated cylinder with some about 10.0 ml of the 1.0 M HCl. Completely dry the graduated cylinder with a paper towel drying wand. Carefully measure 6.25 ml of the 1.0 M HCl. Leaving the HCl in the graduated cylinder measure the initial temperature of acid. 27.8∘C

The first part of the lab was initiated to figure out the relationship between pressure and volume. First, materials and chemicals were prepared. The LabQuest was properly setup and ready to use to collect data. The power adapter was plugged into the left side of the LabQuest machine. In Channel 1, the gas pressure sensor was plugged in. The settings were changed to “Data Collection”, “Events with Entry” for mode, “1” for the number of columns, “Volume” for name box, and “mL" for unit box. After the LabQuest was set up the syringe used in conjunction with the gas pressure sensor was prepared. Before the syringe was connected to the sensor, the plunger within the syringe was adjusted until the tip of the inner most black ring was parallel to the 10.0 mL line. Next, the syringe was connected to the valve of the gas pressure sensor, making sure not the over-tighten the connectors. The connectors are made of plastic and can break, but making sure the connected syringes are firmly attached will avoid inexact information. When recording the volume of the syringe into the LabQuest, 0.8mL should be added the volume to make the data more precise because there was extra space in the gas pressor sensor. By selecting “Collect”, the

11) The gas accumulation in the balloon was measured and recorded at one minute intervals for a total of 10 minutes (qualitative observations were included)

CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet